National Weather Service United States Department of Commerce

Barry Fading Away; Attention Turns To Major Summer Heat Wave

Post-Tropical Barry continues to steadily weaken and will fade away over the next day or two. The decaying system may still produce very heavy rainfall and possible flash flooding from the Lower Mississippi Valley to the Ohio Valley. Attention on the weather then shifts from Barry to a major summer heat wave mid to late week into the weekend, across much of the Central and Eastern states. Read More >

Overview

A midlevel vorticity maximum approached the Northeast and Mid-Atlantic on 29 May 2019, with a weak surface low progressing eastward along a quasi-zonally oriented baroclinic zone stretching from the Ohio Valley to the East Coast.  Strong heating to the south of the associated warm front allowed for the development of numerous severe storms by early afternoon.  The environment was quite favorable for significant severe weather, with mixed-layer CAPE (MLCAPE) exceeding 2000 J/kg and deep-layer bulk shear in excess of 45 kts.  Storms remained relatively discrete through late afternoon, allowing for the development of intense and long-lived supercells that produced large (up to 2 inches in diameter) hail in eastern Pennsylvania and adjacent northern/central New Jersey as well as a brief tornado in Lehigh and Bucks Counties.  Storms eventually congealed into a quasi-linear convective system, with the main hazards transitioning to wind damage and flash flooding.  Training of storms occurred in portions of eastern Pennsylvania and central New Jersey, where several instances of flash flooding occurred.  Sadly, there was one fatality in Bucks County associated with flash flooding on Neshaminy Creek.

Note that this page will be updated with additional information in the coming days.

Image
Composite radar loop of the Lehigh Valley supercell on 29 May 2019.

Meteorological Environment/Setup

Synoptic Overview at 12z 29 May 2019 (courtesy of SPC)

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Figure 1: 250-mb analysis Figure 2: 300-mb analysis Figure 3: 500-mb analysis
 
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Figure 4: 700-mb analysis Figure 5: 850-mb analysis Figure 6: 925-mb analysis

Synoptic Overview at 00z 30 May 2019 (courtesy of SPC)

Environment Environment Environment
Figure 7: 250-mb analysis Figure 8: 300-mb analysis Figure 9: 500-mb analysis
 
Environment Environment Environment
Figure 10: 700-mb analysis Figure 11: 850-mb analysis Figure 12: 925-mb analysis
 

Surface Maps (courtesy of WPC)

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Figure 13: 15z surface map Figure 14: 18z surface map Figure 15: 21z surface map
 
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Figure 16: 00z surface map Figure 17: 03z surface map Figure 18: 06z surface map

Observed Soundings
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Figure 19: 12z Pittsburgh, PA sounding Figure 20: 12z Sterling, VA sounding Figure 21: 12z Wallops Island, VA sounding
Environment Environment Environment
Figure 22: 00z Pittsburgh, PA sounding Figure 23: 00z Sterling, VA sounding Figure 24: 00z Wallops Island, VA sounding

Preliminary Storm Reports

prelimreports prelimreports prelimreports
Figure 1: National Preliminary Reports 12z 29 May 2019 to 12z 30 May 2019 Figure 2: Zoomed Preliminary Reports for the same period. Figure 3: Prelim Reports vs. 1630z SPC Convective Outlook

Click here for a county warning area based plot of local storm reports and warnings/advisories issued for the 29 May 2019 event.

Preliminary Local Storm Reports

 

NWUS51 KPHI 021609
LSRPHI

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1209 PM EDT SUN JUN 2 2019

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0245 PM     HAIL             TREXLERTOWN             40.55N 75.60W
05/29/2019  M1.00 INCH       LEHIGH             PA   PUBLIC           

             

0250 PM     HAIL             MERTZTOWN               40.51N 75.67W
05/29/2019  M2.00 INCH       BERKS              PA   TRAINED SPOTTER  

            HAIL UP TO 2 INCHES REPORTED IN MERTZTOWN. 

0252 PM     HAIL             KUTZTOWN                40.52N 75.78W
05/29/2019  M0.75 INCH       BERKS              PA   PUBLIC           

             

0253 PM     HAIL             BREINIGSVILLE           40.54N 75.63W
05/29/2019  E1.75 INCH       LEHIGH             PA   PUBLIC           

            TIME ESTIMATED FROM RADAR. 

0300 PM     HAIL             BREINIGSVILLE           40.54N 75.63W
05/29/2019  M1.00 INCH       LEHIGH             PA   TRAINED SPOTTER  

             

0300 PM     HAIL             EMMAUS                  40.53N 75.49W
05/29/2019  M1.25 INCH       LEHIGH             PA   TRAINED SPOTTER  

             

0305 PM     HAIL             TREXLERTOWN             40.55N 75.60W
05/29/2019  M0.25 INCH       LEHIGH             PA   TRAINED SPOTTER  

             

0306 PM     HAIL             TREXLERTOWN             40.55N 75.60W
05/29/2019  M0.75 INCH       LEHIGH             PA   TRAINED SPOTTER  

             

0308 PM     HAIL             MACUNGIE                40.52N 75.56W
05/29/2019  M1.75 INCH       LEHIGH             PA   TRAINED SPOTTER  

             

0314 PM     HAIL             VERA CRUZ               40.51N 75.50W
05/29/2019  E1.75 INCH       LEHIGH             PA   PUBLIC           

            TIME ESTIMATED FROM RADAR. 

0314 PM     TORNADO          2 NNW GERYVILLE         40.45N 75.49W
05/29/2019                   LEHIGH             PA   NWS STORM SURVEY 

            NWS STORM SURVEY CONFIRMED AN EF-0 TORNADO 
            DEVELOPED IN LOWER MILFORD TWP IN LEHIGH 
            COUNTY. TREES WERE SNAPPED AND UPROOTED 
            ALONG ITS 2.3 MILE PATH INTO NORTHERN 
            MILFORD TWP IN BUCKS COUNTY. MAXIMUM 
            ESTIMATED WINDS OF 80 MPH. 

0315 PM     HAIL             EMMAUS                  40.54N 75.49W
05/29/2019  E1.50 INCH       LEHIGH             PA   TRAINED SPOTTER  

             

0317 PM     TSTM WND DMG     2 NW COOLBAUGH TWP      41.20N 75.37W
05/29/2019                   MONROE             PA   PUBLIC           

            DELAYED REPORT. DOWNED TREES ON MOUNTAIN 
            DRIVE. TIME ESTIMATED FROM RADAR. 

0319 PM     HAIL             UPPER SAUCON TWP        40.54N 75.41W
05/29/2019  E1.00 INCH       LEHIGH             PA   PUBLIC           

            TIME ESTIMATED FROM RADAR. 

0320 PM     HAIL             QUAKERTOWN              40.44N 75.34W
05/29/2019  M1.00 INCH       BUCKS              PA   PUBLIC           

             

0321 PM     HAIL             COOPERSBURG             40.51N 75.39W
05/29/2019  E2.00 INCH       LEHIGH             PA   PUBLIC           

            PHOTOS OF HAIL LARGER THAN GOLF BALLS IN 
            COOPERSBURG. TIME ESTIMATED FROM RADAR. 

0326 PM     HAIL             5 SW PLEASANT VALLEY    40.47N 75.36W
05/29/2019  M2.00 INCH       BUCKS              PA   TRAINED SPOTTER  

            HAIL FELL FOR APPROX 10 MINUTES. WIDESPREAD 
            QUARTER TO HALF DOLLAR SIZED HAIL WITH 2 
            INCH HAIL INCLUDED. 

0335 PM     TSTM WND DMG     2 NE ANALOMINK          41.07N 75.19W
05/29/2019                   MONROE             PA   DEPT OF HIGHWAYS 

            DOWNED TREE IN WIRES ON SCHOOL HOUSE RD. 
            TIME ESTIMATED FROM RADAR. 

0335 PM     HAIL             LANSFORD                40.83N 75.88W
05/29/2019  M0.50 INCH       CARBON             PA   TRAINED SPOTTER  

             

0343 PM     TSTM WND DMG     1 W SWIFTWATER          41.09N 75.34W
05/29/2019                   MONROE             PA   PUBLIC           

            CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 1 
            W SWIFTWATER. DELAYED REPORT. DOWNED TREE ON 
            SUMMIT ROAD NEAR SWIFTWATER FORCING ITS 
            CLOSURE. TIME ESTIMATED FROM RADAR. 

0343 PM     HAIL             BEDMINSTER              40.43N 75.18W
05/29/2019  E1.00 INCH       BUCKS              PA   BROADCAST MEDIA  

             

0345 PM     HAIL             ALBRIGHTSVILLE          41.01N 75.57W
05/29/2019  E1.25 INCH       CARBON             PA   PUBLIC           

            TIME ESTIMATED FROM RADAR. 

0355 PM     HAIL             QUAKERTOWN              40.44N 75.34W
05/29/2019  M1.50 INCH       BUCKS              PA   PUBLIC           

             

0356 PM     TSTM WND DMG     1 NNW MARION TWP        40.41N 76.21W
05/29/2019                   BERKS              PA   FIRE DEPT/RESCUE 

            DELAYED REPORT. DOWNED TREE AND WIRES ON 
            STONE ROAD NEAR ROUTE 419 IN TULPEHOCKEN 
            TWP. TIME ESTIMATED FROM RADAR. 

0358 PM     HAIL             LUMBERVILLE             40.41N 75.04W
05/29/2019  E1.75 INCH       BUCKS              PA   PUBLIC           

             

0359 PM     TSTM WND DMG     3 SSE LENHARTSVILLE     40.53N 75.87W
05/29/2019                   BERKS              PA   FIRE DEPT/RESCUE 

            DELAYED REPORT OF TREE DOWN NEAR THE 
            INTERSECTION OF CRYSTAL CAVE ROAD AND 
            DUNKLES CHURCH ROAD IN RICHMOND TWP. TIME 
            ESTIMATED FROM RADAR. 

0403 PM     HAIL             EFFORT                  40.94N 75.44W
05/29/2019  E0.88 INCH       MONROE             PA   TRAINED SPOTTER  

             

0403 PM     TSTM WND GST     EFFORT                  40.94N 75.44W
05/29/2019  E60 MPH          MONROE             PA   TRAINED SPOTTER  

             

0412 PM     TSTM WND DMG     PIKE TWP                40.41N 75.70W
05/29/2019                   BERKS              PA   FIRE DEPT/RESCUE 

            DELAYED REPORT. SEVERAL REPORTS OF TREES AND 
            POWER LINES DOWN IN PIKE TWP, INCLUDING ON 
            HILL CHURCH ROAD, MERKLE ROAD, AND LUTZ 
            ROAD. TIME ESTIMATED FROM RADAR. 

0415 PM     TSTM WND DMG     2 SE DELAWARE WATER GAP 40.97N 75.12W
05/29/2019                   MONROE             PA   FIRE DEPT/RESCUE 

            DELAYED REPORT. EXTENSIVE TREE DAMAGE ON 
            ROUTE 611 IN DELAWARE WATER GAP NATIONAL 
            RECREATION AREA. THE ROAD WAS CLOSED FOR 
            SEVERAL HOURS. TIME ESTIMATED FROM RADAR. 

0418 PM     TSTM WND DMG     1 SW HUFFS CHURCH       40.44N 75.63W
05/29/2019                   BERKS              PA   FIRE DEPT/RESCUE 

            DELAYED REPORT OF TREES AND POWER LINES DOWN 
            ON LONG LANE IN HEREFORD TWP. TIME ESTIMATED 
            FROM RADAR. 

0418 PM     HAIL             MUHLENBERG TWP          40.38N 75.93W
05/29/2019  E1.00 INCH       BERKS              PA   NEWSPAPER        

            SEVERAL REPORTS OF HAIL UP TO QUARTER SIZE 
            IN LAURELDALE AND MUHLENBERG TWP. TIME 
            ESTIMATED FROM RADAR. 

0420 PM     HAIL             EAST AMWELL             40.48N 74.79W
05/29/2019  M1.50 INCH       HUNTERDON          NJ   TRAINED SPOTTER  

             

0420 PM     HAIL             HOPEWELL                40.39N 74.76W
05/29/2019  E1.00 INCH       MERCER             NJ   PUBLIC           

             

0421 PM     TSTM WND DMG     2 SSW BLAIRSTOWN        40.96N 75.01W
05/29/2019                   WARREN             NJ   COUNTY OFFICIAL  

            CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 2 
            SSW BLAIRSTOWN. DELAYED REPORT. SEVERAL 
            TREES DOWN ON CEDAR LAKE ROAD. TIME 
            ESTIMATED FROM RADAR. 

0423 PM     HAIL             READING REGIONAL AIRPOR 40.37N 75.96W
05/29/2019  E0.25 INCH       BERKS              PA   TRAINED SPOTTER  

             

0423 PM     TSTM WND DMG     3 NNW EXETER TWP        40.36N 75.85W
05/29/2019                   BERKS              PA   FIRE DEPT/RESCUE 

            DELAYED REPORT OF TREE DOWN ON FRIEDENSBURG 
            ROAD IN LOWER ALSACE TWP. TIME ESTIMATED 
            FROM RADAR. 

0423 PM     TSTM WND DMG     MOUNT PENN              40.33N 75.89W
05/29/2019                   BERKS              PA   FIRE DEPT/RESCUE 

            DELAYED REPORT OF TREES AND WIRES DOWN NEAR 
            THE INTERSECTION OF 23RD STREET AND 
            CUMBERLAND AVENUE. TIME ESTIMATED FROM 
            RADAR. 

0424 PM     HAIL             HOPEWELL                40.39N 74.76W
05/29/2019  E0.70 INCH       MERCER             NJ   TRAINED SPOTTER  

             

0426 PM     HAIL             EXETER TWP              40.32N 75.84W
05/29/2019  E1.00 INCH       BERKS              PA   NEWSPAPER        

            TIME ESTIMATED FROM RADAR. 

0430 PM     TSTM WND DMG     2 SW SPRING TWP         40.30N 76.03W
05/29/2019                   BERKS              PA   EMERGENCY MNGR   

            MULTIPLE LARGE TREES SNAPPED OR UPROOTED. 
            PUBLIC REPORT RELAYED BY EMERGENCY 
            MANAGEMENT. TIME ESTIMATED. 

0432 PM     TSTM WND DMG     2 NNW GERYVILLE         40.45N 75.49W
05/29/2019                   LEHIGH             PA   DEPT OF HIGHWAYS 

            DOWNED TREE ON WIRES ON VERA CRUZ RD. TIME 
            ESTIMATED FROM RADAR. 

0437 PM     TSTM WND DMG     1 NE BELVIDERE          40.84N 75.06W
05/29/2019                   WARREN             NJ   COUNTY OFFICIAL  

            DELAYED REPORT. DOWNED TREE ON MANUNKA CHUNK 
            ROAD NEAR U.S. HIGHWAY 46. TIME ESTIMATED 
            FROM RADAR. 

0437 PM     TSTM WND DMG     HARMONY TWP             40.75N 75.14W
05/29/2019                   WARREN             NJ   COUNTY OFFICIAL  

            DELAYED REPORT OF SEVERAL TREES DOWN IN 
            HARMONY TWP. TIME ESTIMATED FROM RADAR. 

0437 PM     TSTM WND DMG     EARL TWP                40.36N 75.70W
05/29/2019                   BERKS              PA   FIRE DEPT/RESCUE 

            DELAYED REPORT. SEVERAL REPORTS OF TREES 
            DOWN IN EARL TWP AND OLEY TWP, INCLUDING ON 
            SHEEP HILL ROAD, PINE ROAD, AND SAW MILL 
            ROAD IN EARL TWP AND MAIN STREET AND 
            KAUFFMAN ROAD IN OLEY TWP. TIME ESTIMATED 
            FROM RADAR. 

0440 PM     HAIL             BOYERTOWN               40.34N 75.64W
05/29/2019  E1.00 INCH       BERKS              PA   PUBLIC           

            DELAYED REPORT FROM WEDNESDAY. TIME 
            ESTIMATED FROM RADAR. 

0440 PM     TSTM WND DMG     DOUGLASS TWP            40.32N 75.68W
05/29/2019                   BERKS              PA   FIRE DEPT/RESCUE 

            DELAYED REPORT. SEVERAL REPORTS OF TREES AND 
            WIRES DOWN IN DOUGLASS TWP, INCLUDING ON 
            POPLAR ROAD, READING AVENUE, AND TROUT RUN 
            ROAD. TIME ESTIMATED FROM RADAR. 

0442 PM     HAIL             YARDVILLE               40.18N 74.67W
05/29/2019  E1.25 INCH       MERCER             NJ   PUBLIC           

             

0446 PM     HAIL             1 SE YARDVILLE          40.17N 74.65W
05/29/2019  E0.88 INCH       MERCER             NJ   TRAINED SPOTTER  

             

0448 PM     TSTM WND DMG     PERKASIE                40.38N 75.30W
05/29/2019                   BUCKS              PA   PUBLIC           

            AT LEAST ONE LARGE TREE DOWN. TIME ESTIMATED 
            FROM RADAR. 

0450 PM     HAIL             BOYERTOWN               40.33N 75.64W
05/29/2019  E0.25 INCH       BERKS              PA   TRAINED SPOTTER  

             

0451 PM     TSTM WND GST     2 WSW LENHARTSVILLE     40.56N 75.93W
05/29/2019  M77 MPH          BERKS              PA   MESONET          

             

0455 PM     TSTM WND DMG     3 W LOWER FREDERICK TWP 40.27N 75.52W
05/29/2019                   MONTGOMERY         PA   PUBLIC           

            NEIFFER RD CLOSED FROM RTE 73 TO RIDGE PIKE 
            DUE TO DOWNED TREES. TIME ESTIMATED FROM 
            RADAR. 

0455 PM     TSTM WND DMG     1 SE GREEN LANE         40.33N 75.45W
05/29/2019                   MONTGOMERY         PA   FIRE DEPT/RESCUE 

            NUMEROUS TREES DOWN. TIME ESTIMATED FROM 
            RADAR. 

0455 PM     TSTM WND DMG     PERKIOMENVILLE          40.33N 75.48W
05/29/2019                   MONTGOMERY         PA   TRAINED SPOTTER  

            SEVERAL TREES AND POWER LINES DOWN. TIME 
            ESTIMATED FROM RADAR. 

0456 PM     HAIL             GREEN LANE              40.34N 75.47W
05/29/2019  E1.00 INCH       MONTGOMERY         PA   PUBLIC           

             

0456 PM     TSTM WND GST     1 N GREEN LANE          40.35N 75.47W
05/29/2019  E55 MPH          MONTGOMERY         PA   TRAINED SPOTTER  

             

0500 PM     TSTM WND DMG     UPPER SALFORD TWP       40.29N 75.45W
05/29/2019                   MONTGOMERY         PA   PUBLIC           

            TREES DOWN IN WOXALL/UPPER SALFORD TWP. 

0505 PM     TSTM WND DMG     LEHIGH TWP              40.76N 75.53W
05/29/2019                   NORTHAMPTON        PA   LAW ENFORCEMENT  

            WIRES DOWN, ALONG WITH LARGE BRANCHES. TIME 
            ESTIMATED FROM RADAR. 

0512 PM     TSTM WND GST     1 ENE HAMBURG           40.57N 75.96W
05/29/2019  M66 MPH          BERKS              PA   PUBLIC           

            MEASURED BY A PERSONAL WEATHER STATION. TIME 
            ESTIMATED FROM RADAR. 

0515 PM     HAIL             2 S FREEHOLD TWP        40.21N 74.29W
05/29/2019  E1.00 INCH       MONMOUTH           NJ   PUBLIC           

             

0515 PM     HAIL             TELFORD                 40.32N 75.33W
05/29/2019  M0.75 INCH       MONTGOMERY         PA   TRAINED SPOTTER  

             

0515 PM     TSTM WND DMG     DOYLESTOWN              40.31N 75.13W
05/29/2019                   BUCKS              PA   PUBLIC           

            TREES AND POWER LINES REPORTED DOWN. 

0519 PM     TSTM WND DMG     2 WSW LAURELDALE        40.38N 75.95W
05/29/2019                   BERKS              PA   PUBLIC           

            DELAYED REPORT OF TREE AND WIRES DOWN ON 
            RIVER ROAD IN MUHLENBERG TWP. TIME ESTIMATED 
            FROM RADAR. 

0521 PM     FLOOD            HACKETTSTOWN            40.85N 74.83W
05/29/2019                   WARREN             NJ   TRAINED SPOTTER  

            WATER COVERING A FEW ROADS IN HACKETTSTOWN. 

0524 PM     TSTM WND DMG     1 NNW SHILLINGTON       40.31N 75.97W
05/29/2019                   BERKS              PA   FIRE DEPT/RESCUE 

            DELAYED REPORT OF TREES DOWN ON MUSEUM ROAD 
            BETWEEN LANCASTER AVENUE AND OLD MILL ROAD. 
            TIME ESTIMATED FROM RADAR. 

0525 PM     TSTM WND DMG     2 SSE ZIONSVILLE        40.45N 75.49W
05/29/2019                   LEHIGH             PA   DEPT OF HIGHWAYS 

            TREE DOWN ONTO WIRES. TIME ESTIMATED FROM 
            RADAR. 

0530 PM     TSTM WND DMG     2 WSW HOPEWELL          40.37N 74.80W
05/29/2019                   MERCER             NJ   DEPT OF HIGHWAYS 

            DOWNED TREE AND WIRES ON NJ-31 IN BOTH 
            DIRECTIONS NORTH OF CR-612. ALL LANES 
            CLOSED. TIME ESTIMATED FROM RADAR. 

0533 PM     TSTM WND DMG     1 NW BLAIRSTOWN TWP     40.99N 74.96W
05/29/2019                   WARREN             NJ   LAW ENFORCEMENT  

            WIRES/TREE DOWN ON THE ROADS. 

0534 PM     TSTM WND DMG     2 ENE ROBESON TWP       40.25N 75.84W
05/29/2019                   BERKS              PA   FIRE DEPT/RESCUE 

            DELAYED REPORT OF DOWNED TREE BLOCKING THE 
            ROADWAY ON CEDAR HILL ROAD NORTH OF COCALICO 
            ROAD. TIME ESTIMATED FROM RADAR. 

0535 PM     TSTM WND DMG     1 SSE NEWTOWN           40.21N 74.93W
05/29/2019                   BUCKS              PA   STORM CHASER     

            MANY LARGE TREE BRANCHES (6 IN DIAMETER) 
            BROKEN. TIME ESTIMATED FROM RADAR. 

0535 PM     TSTM WND DMG     BOYERTOWN               40.34N 75.64W
05/29/2019                   BERKS              PA   PUBLIC           

            TREES REPORTED DOWN IN BOYERTOWN. TIME 
            ESTIMATED FROM RADAR. 

0535 PM     TSTM WND DMG     2 SSE MARLBOROUGH TWP   40.32N 75.44W
05/29/2019                   MONTGOMERY         PA   TRAINED SPOTTER  

            PHOTO OF A LARGE TREE SNAPPED NEAR THE BASE. 

0538 PM     TSTM WND DMG     HARLEYSVILLE            40.28N 75.40W
05/29/2019                   MONTGOMERY         PA   PUBLIC           

            MULTIPLE TREES REPORTED DOWN AT THE LANDIS 
            PARKING LOT IN HARLEYSVILLE. TIME ESTIMATED 
            FROM RADAR. 

0539 PM     TSTM WND DMG     1 WSW STOWE             40.24N 75.70W
05/29/2019                   BERKS              PA   FIRE DEPT/RESCUE 

            DELAYED REPORT. DOWNED TREE ON ROUTE 724 
            NEAR THE CHESTER COUNTY LINE. TIME ESTIMATED 
            FROM RADAR. 

0540 PM     HAIL             1 N COLEBROOKDALE TWP   40.35N 75.66W
05/29/2019  E0.25 INCH       BERKS              PA   TRAINED SPOTTER  

             

0542 PM     TSTM WND DMG     VERNFIELD               40.30N 75.41W
05/29/2019                   MONTGOMERY         PA   PUBLIC           

            TREES SNAPPED AND SOME UPROOTED, SHINGLES 
            TORN OFF, BARN ABOUT 1/2 MILE AWAY WAS BLOWN 
            DOWN. ALSO REPORTED HAIL THE SIZE OF 
            NICKELS. TIME ESTIMATED FROM RADAR. 

0544 PM     TSTM WND DMG     PRINCETON               40.35N 74.66W
05/29/2019                   MERCER             NJ   DEPT OF HIGHWAYS 

            DOWNED UTILITY POLE AND WIRES ON NJ-27 IN 
            BOTH DIRECTIONS AT CR 571 AND WASHINGTON ST. 
            ALL LANES CLOSED. 

0545 PM     TSTM WND DMG     SELLERSVILLE            40.36N 75.31W
05/29/2019                   BUCKS              PA   TRAINED SPOTTER  

            MULTIPLE TREES DOWN WITH POWER OUTAGES. TIME 
            ESTIMATED FROM RADAR. 

0547 PM     FLASH FLOOD      1 NNW READING           40.34N 75.93W
05/29/2019                   BERKS              PA   FIRE DEPT/RESCUE 

            DELAYED REPORT. VEHICLE STUCK IN WATER 
            REQUIRING RESCUE NEAR INTERSECTION OF CHURCH 
            STREET AND WOODWARD STREET. 

0550 PM     HAIL             RICHLAND TWP            40.49N 75.34W
05/29/2019  E1.00 INCH       BUCKS              PA   PUBLIC           

             

0550 PM     TSTM WND DMG     LOWER FREDERICK TWP     40.30N 75.46W
05/29/2019                   MONTGOMERY         PA   EMERGENCY MNGR   

            HOME REPORTED DAMAGED ON WALNUT LN WITH 
            RESIDENT NEEDING ASSISTANCE TO BE EXTRACTED. 
            TIME ESTIMATED FROM RADAR. 

0600 PM     HAIL             HATBORO                 40.17N 75.11W
05/29/2019  E0.88 INCH       MONTGOMERY         PA   PUBLIC           

             

0600 PM     HAIL             2 S HORSHAM TWP         40.18N 75.18W
05/29/2019  M0.88 INCH       MONTGOMERY         PA   PUBLIC           

             

0600 PM     FLASH FLOOD      2 NNW STEWARTSVILLE     40.72N 75.13W
05/29/2019                   WARREN             NJ   COUNTY OFFICIAL  

            LOWS HOLLOW ROAD DAMAGED AND WASHED OUT BY 
            FLOOD WATERS. TIME ESTIMATED BY RADAR. 

0602 PM     HAIL             1 WSW HORSHAM           40.17N 75.15W
05/29/2019  E0.70 INCH       MONTGOMERY         PA   PUBLIC           

             

0605 PM     HAIL             WARMINSTER TWP          40.20N 75.09W
05/29/2019  M0.75 INCH       BUCKS              PA   PUBLIC           

             

0605 PM     TSTM WND DMG     2 WNW WOODLAWN          39.64N 76.10W
05/29/2019                   CECIL              MD   PUBLIC           

            STRONG WINDS UPROOTED AND SNAPPED SEVERAL 
            TREES ALONG A PATH THROUGH A WOODED AREA 
            BETWEEN TWO RESIDENCES. DELAYED REPORT FROM 
            WEDNESDAY. 

0606 PM     TSTM WND DMG     1 ENE BERWYN            40.05N 75.43W
05/29/2019                   CHESTER            PA   DEPT OF HIGHWAYS 

            TREE DOWN ON WATERLOO RD. TIME ESTIMATED 
            FROM RADAR. 

0610 PM     HAIL             2 SSE WARMINSTER TWP    40.16N 75.06W
05/29/2019  M1.00 INCH       MONTGOMERY         PA   NWS EMPLOYEE     

             

0610 PM     HAIL             WILLOW GROVE            40.14N 75.12W
05/29/2019  M1.00 INCH       MONTGOMERY         PA   PUBLIC           

             

0610 PM     TSTM WND GST     1 E NEWTOWN             40.23N 74.91W
05/29/2019  E70 MPH          BUCKS              PA   STORM CHASER     

            TIME ESTIMATED FROM RADAR. 

0612 PM     HAIL             3 W LOWER SOUTHAMPTON T 40.17N 75.04W
05/29/2019  E0.70 INCH       BUCKS              PA   PUBLIC           

             

0615 PM     TSTM WND GST     NORTHEAST PHILADELPHIA  40.08N 75.01W
05/29/2019  M59 MPH          PHILADELPHIA       PA   ASOS             

             

0619 PM     TSTM WND DMG     1 NNW HOLMESBURG        40.06N 75.03W
05/29/2019                   PHILADELPHIA       PA   PUBLIC           

            DELAYED REPORT. DOWNED TREE BLOCKING HOLME 
            ROAD BETWEEN WINCHESTER AND NAZARETH. TIME 
            ESTIMATED FROM RADAR. 

0620 PM     FLASH FLOOD      FEASTERVILLE-TREVOSE    40.13N 74.97W
05/29/2019                   BUCKS              PA   TRAINED SPOTTER  

            VIDEO RECEIVED OF FAST MOVING WATER FLOWING 
            DOWN A ROADWAY. 

0622 PM     TSTM WND DMG     2 WSW KENNEDYVILLE      39.29N 76.03W
05/29/2019                   KENT               MD   EMERGENCY MNGR   

            LARGE EQUESTRIAN ARENA BARN DAMAGED AND 
            NUMEROUS TREES DOWN ON STILL POND ROAD. 
            WINDS ESTIMATED BETWEEN 65 AND 75 MPH. 
            DELAYED REPORT FROM WEDNESDAY EVENING. 

0622 PM     FLASH FLOOD      3 W LOWER SOUTHAMPTON T 40.17N 75.04W
05/29/2019                   BUCKS              PA   PUBLIC           

            AT THE INTERSECTION OF STREET ROAD AND 
            DAVISVILLE ROAD, THE ROAD IMPASSIBLE. 
            MOTORISTS STUCK IN WATER. 

0624 PM     TSTM WND DMG     1 ESE MALVERN           40.03N 75.50W
05/29/2019                   CHESTER            PA   PUBLIC           

            DOWNED UTILITY ON PAOLI PIKE NEAR GRUBB 
            ROAD. TIME ESTIMATED FROM RADAR. 

0630 PM     MARINE TSTM WIND 1 ENE MANASQUAN         40.13N 74.03W
05/29/2019  M41 MPH          ANZ450             NJ   MESONET          

            DELAYED REPORT FROM WEDNESDAY. 

0630 PM     HAIL             MOORESTOWN              39.97N 74.94W
05/29/2019  E0.70 INCH       BURLINGTON         NJ   PUBLIC           

             

0635 PM     TSTM WND DMG     1 ENE BERWYN            40.05N 75.43W
05/29/2019                   CHESTER            PA   DEPT OF HIGHWAYS 

            TREE DOWN. 

0637 PM     TSTM WND DMG     1 NNW WOODLAWN          39.65N 76.09W
05/29/2019                   CECIL              MD   DEPT OF HIGHWAYS 

            DOWNED TREES AND WIRES AND WIND-BLOWN DEBRIS 
            CLOSED COLORA ROAD NEAR FIRETOWER ROAD. TIME 
            ESTIMATED FROM RADAR. 

0645 PM     TSTM WND DMG     1 WSW HYDE PARK         39.74N 75.67W
05/29/2019                   NEW CASTLE         DE   TRAINED SPOTTER  

            SEVERAL LARGE TREES DOWN IN THE SHERWOOD II 
            DEVELOPMENT. TIME ESTIMATED FROM RADAR. 

0655 PM     TSTM WND DMG     HYDE PARK               39.75N 75.64W
05/29/2019                   NEW CASTLE         DE   PUBLIC           

            TREES REPORTED DOWN IN BRANDYWINE SPRINGS. 
            TIME ESTIMATED FROM RADAR. 

0657 PM     TSTM WND GST     NEW CASTLE COUNTY AIRPO 39.67N 75.61W
05/29/2019  M58 MPH          NEW CASTLE         DE   ASOS             

             

0700 PM     FLASH FLOOD      1 SSE MARLBOROUGH TWP   40.33N 75.45W
05/29/2019                   MONTGOMERY         PA   FIRE DEPT/RESCUE 

            CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 1 
            SSE MARLBOROUGH TWP. SEVERAL ROADS 
            IMPASSABLE IN SUMNEYTOWN. 

0700 PM     FLASH FLOOD      2 E OLEY                40.39N 75.75W
05/29/2019                   BERKS              PA   NEWSPAPER        

            WATER RESCUE AT INTERSECTION OF BERTOLET 
            MILL ROAD AND SNYDER ROAD IN OLEY TWP. 

0701 PM     MARINE TSTM WIND 1 E BARNEGAT LIGHT      39.76N 74.09W
05/29/2019  M43 MPH          ANZ451             NJ   MESONET          

            WEATHERFLOW SENSOR. 

0706 PM     MARINE TSTM WIND 7 W FORTESCUE           39.25N 75.31W
05/29/2019  M66 MPH          ANZ430             NJ   MESONET          

             

0706 PM     MARINE TSTM WIND 1 NNE DELAWARE CITY     39.58N 75.59W
05/29/2019  M41 MPH          NEW CASTLE         DE   MESONET          

             

0707 PM     MARINE TSTM WIND 1 SSW SHIP BOTTOM       39.63N 74.18W
05/29/2019  M42 MPH          ANZ451             NJ   MESONET          

            DELAYED REPORT FROM WEDNESDAY. 

0708 PM     TSTM WND DMG     GREENSBORO              38.98N 75.81W
05/29/2019                   CAROLINE           MD   EMERGENCY MNGR   

            MULTIPLE TREES AND POWER LINES DOWN. TIME 
            ESTIMATED FROM RADAR. 

0711 PM     MARINE TSTM WIND 1 ESE TUCKERTON         39.60N 74.31W
05/29/2019  M40 MPH          OCEAN              NJ   MESONET          

             

0715 PM     MARINE TSTM WIND FORTESCUE               39.24N 75.18W
05/29/2019  M49 MPH          CUMBERLAND         NJ   MESONET          

            NJWXNET GAUGE. 

0715 PM     MARINE TSTM WIND 4 SE MYSTIC ISLAND      39.52N 74.32W
05/29/2019  M45 MPH          OCEAN              NJ   MESONET          

            WEATHERFLOW SENSOR. 

0716 PM     MARINE TSTM WIND 2 SW BEACH HAVEN        39.54N 74.26W
05/29/2019  M39 MPH          OCEAN              NJ   MESONET          

             

0720 PM     FLASH FLOOD      RIVERSIDE               40.04N 74.96W
05/29/2019                   BURLINGTON         NJ   PUBLIC           

            PHOTO SENT OF STREET FLOODING. 

0730 PM     FLASH FLOOD      DELRAN                  40.02N 74.95W
05/29/2019                   BURLINGTON         NJ   NWS EMPLOYEE     

            MULTIPLE ROADS IMPASSABLE. 

0735 PM     TSTM WND DMG     1 SE LAUREL LAKE        39.32N 75.02W
05/29/2019                   CUMBERLAND         NJ   TRAINED SPOTTER  

            A FEW TEES DOWN, INCLUDING ONE DOWNED INTO 
            WIRES AT THE INTERSECTION OF EVERGREEN AND 
            SPRING GARDEN. TIME ESTIMATED FROM RADAR. 

0800 PM     FLASH FLOOD      1 WNW BRISTOL           40.10N 74.87W
05/29/2019                   BUCKS              PA   TRAINED SPOTTER  

            SEVERAL REPORTS OF WATER RESCUES FROM THE 
            AREAS OF BRISTOL, BENSALEM, AND MIDDLETOWN 
            TOWNSHIP. 

0802 PM     MARINE TSTM WIND 1 SSW NORTH CAPE MAY    38.97N 74.96W
05/29/2019  M51 MPH          CAPE MAY           NJ   MESONET          

            WEATHERFLOW SENSOR. 

0806 PM     MARINE TSTM WIND 2 WSW ATLANTIC CITY     39.35N 74.46W
05/29/2019  M39 MPH          ANZ452             NJ   MESONET          

            HADS SENSOR. 

0812 PM     MARINE TSTM WIND STONE HARBOR            39.06N 74.77W
05/29/2019  M40 MPH          ANZ453             NJ   MESONET          

             

0830 PM     FLASH FLOOD      2 S LANGHORNE           40.15N 74.92W
05/29/2019                   BUCKS              PA   EMERGENCY MNGR   

            *** 1 FATAL *** 
            MALE TEENAGER FELL OUT OF KAYAK ON NESHAMINY 
            CREEK NEAR PENNDEL. HE LATER DIED AT AN AREA 
            HOSPITAL. LAW ENFORCEMENT INDICATED RIVER 
            WAS FLOODING AT THE TIME AND LIKELY 
            CONTRIBUTED TO HIS DEATH. TIME AND LOCATION 
            ESTIMATED. 

0842 PM     MARINE TSTM WIND CAPE HENLOPEN BEACH     38.81N 75.10W
05/29/2019  M43 MPH          ANZ431             DE   MESONET          

            DELAYED REPORT FROM WEDNESDAY. 

0845 PM     MARINE TSTM WIND LEWES                   38.78N 75.13W
05/29/2019  M67 MPH          ANZ431             DE   MESONET          

             

0915 PM     HEAVY RAIN       MEDFORD                 39.89N 74.83W
05/29/2019  M3.40 INCH       BURLINGTON         NJ   TRAINED SPOTTER  

            UPDATES PREVIOUS HEAVY RAIN REPORT FROM 
            MEDFORD WITH FINAL TOTAL. 


&&

$$

CMS

Public Information Statement - Tornado

NOUS41 KPHI 302336
PNSPHI
DEZ001>004-MDZ008-012-015-019-020-NJZ001-007>010-012>027-PAZ054-
055-060>062-070-071-101>106-311145-

Public Information Statement
National Weather Service Mount Holly NJ
736 PM EDT Thu May 30 2019

...NWS DAMAGE SURVEY FOR 05/29/2019 TORNADO EVENT...

.Lower Milford Township Tornado...

Start Location...Lower Milford Township in Lehigh County, PA
End Location...Milford Township in Bucks County, PA
Date...May 29, 2019 
Estimated Time...3:14 PM EDT to 3:21 PM EDT 
Maximum EF-Scale Rating...EF0 
Estimated Maximum Wind Speed...80 MPH 
Maximum Path Width...50 yards 
Path Length...2.3 miles 
Beginning Lat/Lon...40.4468/-75.4877 
Ending Lat/Lon...40.4424/-75.4458 
* Fatalities...0
* Injuries...0

...Summary...
A weak EF-0 tornado descended to the ground near the intersection of 
Kings Highway and East Mill Hill Road in the far southern portions of
Lower Milford Township in Lehigh County around 3:14 PM on Wednesday,
May 29th. The tornado then lifted and descended several times as it 
traveled in an east to southeast direction, crossing over the Bucks 
County line into northern portions of Milford Township before lifting
the final time northwest of Spinnerstown. The primary damage from 
this tornado was fallen and snapped trees along the 2.3 mile path,
with at least one home sustaining roof damage from a fallen tree.  

EF Scale: The Enhanced Fujita Scale classifies tornadoes into the
following categories:

EF0...Weak......65 to 85 mph
EF1...Weak......86 to 110 mph
EF2...Strong....111 to 135 mph
EF3...Strong....136 to 165 mph
EF4...Violent...166 to 200 mph
EF5...Violent...>200 mph

The National Weather Service extends its thanks to the Lehigh County 
Office of Emergency Management for there assistance in this survey.


* The information in this statement is preliminary and subject to
change pending final review of the event and publication in NWS
Storm Data.

$$

Public Information Statement - Microburst

NOUS41 KPHI 312149
PNSPHI
DEZ001>004-MDZ008-012-015-019-020-NJZ001-007>010-012>027-PAZ054-
055-060>062-070-071-101>106-312300-

Public Information Statement
National Weather Service Mount Holly NJ
549 PM EDT Fri May 31 2019

...NWS DAMAGE SURVEY FOR 05/29/2019 THUNDERSTORM WIND EVENT...

.Montgomery County Downburst...

Location...Lower Frederick and Upper Salford Townships in Montgomery County, PA
Date...May 29, 2019
Estimated Time...4:55 to 5:00 PM EDT
Estimated Maximum Wind Speed...90-100 mph
* Fatalities...0
* Injuries...0

...Summary...
Severe thunderstorms moved through Lower Frederick and Upper 
Salford Townships in Montgomery County between 4:55 and 5:00 PM 
on Wednesday, May 29. The hardest hit areas were in the vicinity 
of Walnut Lane Trail between Hendricks Road and Salford Station 
Road in Lower Frederick Township, and along the Perkiomen trail 
between Hendricks Road and Salford Station Road in Upper Salford 
Township. Severe Winds from these thunderstorms felled thousands 
of trees and damaged numerous homes, sheds, and automobiles in the
area. Thankfully, no deaths or serious injuries were reported as 
a result of these storms.

Based on a survey by a team of meteorologists from the National 
Weather Service in Mount Holly, NJ, both at ground level and from 
aerial footage, as well as velocity and reflectivity signatures 
from Doppler radar and eyewitness accounts, straight-line winds 
with speeds between 90 and 100 mph were determined to be the cause
of all this damage. No evidence of tornadic activity was found in
the area; the path of damage is consistent with straight-line 
winds.

The National Weather Service would like to thank the Montgomery 
County Office of Emergency Management for their assistance with 
this survey, and to the many residents who were kind enough to 
share their experiences with NWS and emergency management 
officials.

* The information in this statement is preliminary and subject to
change pending final review of the event and publication in NWS
Storm Data.

$$

------

NOUS41 KPHI 301726
PNSPHI
DEZ001>004-MDZ008-012-015-019-020-NJZ001-007>010-012>027-PAZ054-
055-060>062-070-071-101>106-301930-

Public Information Statement
National Weather Service Mount Holly NJ
126 PM EDT Thu May 30 2019

...BUCKS COUNTY STORM SURVEY UPDATE...

The Mount Holly National Weather Service survey team in Bucks 
County in Pennsylvania has determined that the damage sustained 
in and around Doylestown shortly after 5 PM on May 29 was caused 
by straight line winds of 60 to 80 mph. 

Please continue to monitor our Public Information Statements for
the latest regarding today's storm surveys. The team will be 
surveying additional damage through the afternoon.

$$

SFJ

Radar Interrogation

Lehigh/Bucks County Tornado and Very Large Hail (GR2Analyst)

Environment Environment Environment
Figure 1: KDIX radar reflectivity factor (top left), storm-relative motion (SRM; top right), correlation coefficient (CC; bottom left), and differential reflectivity (ZDR; bottom right) valid at 1909 UTC on 29 May 2019. This intense and very classic-looking supercell had already left a swath of 1-2+ inch hail from Kutztown to Macungie. At this point, radar is displaying easily identifiable signals of very large hail in a corridor from Macungie to Emmaus to Coopersburg: a three-body scatter spike (TBSS; seen in the spike of (low) radar reflectivity and very low CC to the northwest of the supercell) and near-zero ZDR collocated with 65+ dBZ radar reflectivity factor in the forward-flank downdraft region of the supercell. There is also a substantial lowering of CC within the forward-flank downdraft, an indication of non-uniform precipitation/hydrometeors (another hail signal). Note that radar also exhibits broad cyclonic rotation via SRM and an indication of tighter rotation near the hook echo of the storm. Figure 2: Same as Fig. 1, valid at 1912 UTC on 29 May 2019. The radar reflectivity factor is slowly increasing within the forward-flank downdraft. There also remains a signal of strong/tight rotation near the hook echo of the storm. This was shortly before tornadogenesis in Lower Milford Township in Lehigh County. Figure 3: Same as Fig. 1, valid at 1914 UTC on 29 May 2019. This was the approximate time of tornadogenesis in Lehigh County. The broader mesocyclonic rotation has increased, the radar reflectivity factor has continued to increase (now to 75 dBZ just east of Macungie), and gate-to-gate shear is slowly increasing near the location of the tornado.
Environment Environment Environment
Figure 4: Same as Fig. 1, valid at 1917 UTC on 29 May 2019. Gate-to-gate shear continues to increase slowly near the Lehigh/Bucks County line as the hail core continues its trek to the north of the tornado track. Two-inch hail was occurring near Coopersburg at this time. Figure 5: Same as Fig. 1, valid at 1919 UTC on 29 May 2019. This image probably best exhibits the tornado, as low-level rotation is strongest at this point just into Bucks County to the west of Trumbauersville. Figure 6: Same as Fig. 1, valid at 1921 UTC on 29 May 2019. The tornado dissipated around this time, and the low-level rotation clearly diminished with this radar scan. Note, however, the extremely high radar reflectivity factor observed near Coopersburg. Values approaching 80 dBZ are depicted here, an indication of very large hail. The TBSS has lengthened and is a strong indication of extremely large hail. Notably, this storm reportedly caused over a million dollars in hail damage in the Lehigh Valley.
Environment Environment
Bonus Figure 1: KDIX radar reflectivity factor (top left), base velocity, correlation coefficient (CC; bottom left), and differential reflectivity (ZDR; bottom right) valid at 1911 UTC on 29 May 2019 for the 1.8 degree elevation angle (around 10,000 to 13,000 feet above ground level). One obvious signal of the storm's severe nature is the presence of a bounded weak echo region (note the lower radar reflectivity factor surrounded by higher values southeast of Macungie). This suggests an updraft that is shunting precipitation (including hail) upward and outward, which takes very high speeds to do. Additionally, base velocities indicate the updraft is rotating rapidly. A three-body scatter spike is present northwest of the hail on the north side of the updraft. Within the updraft is low CC and relatively low ZDR, an indication of a lack of precipitation (and possibly some non-meteorological echo). Bonus Figure 2: A cross-section of the storm valid at 1909 UTC on 29 May 2019 (with panels as in Bonus Fig. 1). Note the lower reflectivity (up to 10 kft AGL) below the elevated high-reflectivity values (15-40 kft AGL) and the tilted nature of the reflectivity from the surface to the 20-30 kft levels. This is a strongly sheared storm with an intense updraft, lofting very large hail (as indicated by the 60-70+ dBZ radar reflectivity in the 15-30 kft AGL layer, with a three-body scatter spike on the left side of the cross-section). It is no surprise this storm produced a large swath of 1.5-2+ inch hail in the Lehigh Valley.

Montgomery County Microburst (GR2Analyst)

Environment Environment Environment
Figure 7: Same as Fig. 1, valid at 2043 UTC on 29 May 2019 (and using base velocity versus storm-relative motion in the top right panel). A severe storm was over Boyertown at this time, with evidence of a TBSS via very low CC to the northwest of Boyertown (an indication of large hail). ZDR is also quite low in this area, another indication of large hail. Quarter size hail was reported at this time. Figure 8: Same as Fig. 1, valid at 2045 UTC on 29 May 2019. The radar reflectivity factor was increasing with the storm, and both the near-zero ZDR and the TBSS (via the low CC) were becoming more obvious/distinct. Though not shown, radar imagery aloft suggested an intense core of higher reflectivity was descending rapidly to the surface at this time, a harbinger of a downburst. Figure 9: Same as Fig. 1, valid at 2048 UTC on 29 May 2019. There are strong indications the most intense portion of the storm is nearing the surface at this point, with a very strong indication of large hail via zero to negative ZDR east of Boyertown collocated with 65+ dBZ radar reflectivity factor. Additionally, base velocities are increasing rapidly in this vicinity (now exceeding 45 kts).
Environment Environment Environment
Figure 10: Same as Fig. 1, valid at 2050 UTC on 29 May 2019. The microburst had reached the surface at this time, with velocity folding quite evident on base velocity. Speeds are 60+ kts on radar at this point (when accounting for the velocity folding), with a very obvious TBSS northwest of the hail core now. Substantial wind damage and numerous reports of large hail occurred between Boyertown and Green Lane around this time. Figure 11: Same as Fig. 1, valid at 2053 UTC on 29 May 2019. The radar reflectivity factor continues to increase, with 50-60+ kt base velocities on radar continuing west of Green Lane. Figure 12: Same as Fig. 1, valid at 2056 UTC on 29 May 2019. The hail core was shrinking, but the microburst was still clearly evident here with very high velocities near/southwest of Green Lane collocated with the most intense radar reflectivity and the TBSS and near-zero ZDR.
Environment Environment Environment
Figure 13: Same as Fig. 1, valid at 2059 UTC on 29 May 2019. The core of the storm is now just south of Green Lane, with 70-75 dBZ radar reflectivity factor values an indication of large hail and intense rainfall. The swath of wind damage continues... Figure 14: Same as Fig. 1, valid at 2101 UTC on 29 May 2019. The TBSS becomes wider as the core again increases in size. However, the base velocities are beginning to decrease as they also expand, which is fairly typical with microbursts. Figure 15: Same as Fig. 1, valid at 2104 UTC on 29 May 2019. The trends seen in the previous radar scan continue here, with a broadening base velocity field. The radar reflectivity factor near the core of the storm has decreased markedly, an indication the strongest portion of the downdraft has descended by this point.
Environment Environment Environment
Figure 16: Cross section of the Montgomery County microburst using KDIX valid at 2048 UTC on 29 May 2019. The top left panel is base reflectivity, the top right panel is storm-relative motion, the bottom left panel is correlation coefficient, and the bottom right panel is differential reflectivity. Radar imagery reveals strong divergence near the top of the storm (40-50 kft AGL; see Fig. 19 below) via outward motion on the west side and inward motion on the east side, convergence closer to the surface (5-20 kft AGL), a deep hail core (as indicated by near-zero ZDR and lowered CC from the surface to 25+ kft AGL and a very obvious three-body scatter spike to the west of the storm, as indicated by very low CC). The convergence around 10-20 kft is a harbinger of a descending precipitation core/downdraft, compounded by intense velocities from west to east on the rear side of the storm (i.e., a rear-inflow jet; see Fig. 19). Figure 17: As in Figure 16, valid at 2053 UTC on 29 May 2019. Radar reflectivity factor has increased markedly aloft, as has the signal for convergence in the 5-20 kft level. The most intense portion of the downburst will reach the surface soon. Velocities in the rear-inflow jet (Fig. 19) are approaching 100 kts. Figure 18: As in Figure 16, valid at 2059 UTC on 29 May 2019. The most intense radar reflectivity factors have now reached the surface. This is the time in which the most significant wind damage with the storm occurred, per numerous reports from the public, spotters, and media. Note that the convergence aloft is descending toward the surface as well. Additionally, the divergence signal near the top of the storm continues to increase, and is well in excess of 100 kts at this time.
Environment
Figure 19: Cross section of base velocities for the Montgomery County microburst using KDIX valid at 2053 UTC (left) and 2059 UTC (right) on 29 May 2019. The arrows indicate the direction of flow as implied by the radar displays. The convergence (yellow arrow west-to-east and cyan arrow east-to-west) implies upward motion above and downward motion below, whereas the divergence aloft (arrows reversed) confirm upward motion from ~10 kft AGL to storm top. Base velocities at 2053 UTC to the rear of the storm (yellow arrow around 10-20 kft AGL) are approaching 100 kts; this is the rear-inflow jet. These intense winds are forced downward when the flow converges with the east-to-west flowing air downstream of the storm. By 2059 UTC, the rear-inflow jet has weakened and is an indication the winds have been forced downward to the surface (via the radar reflectivity factor being highest near the surface at this time; see Fig. 18).

Doylestown Microburst (GR2Analyst)

Environment Environment Environment
Figure 20: Same as Fig. 1, valid at 2109 UTC on 29 May 2019 (and using base velocity versus storm-relative motion in the top right panel). Storms were beginning to congeal during this phase of the event, with the same storm that produced the intense microburst in Montgomery County (now near Souderton) congealing with a supercell near Doylestown. Base velocities were very high (60+ kts, when accounting for velocity folding) near Souderton, indicative of very strong winds that were likely reaching the surface. There are indications of a three-body scatter spike just northwest of Souderton, with ZDR suggesting hail is present as well. Up to quarter-size hail was reported with the storm, with radar indicating a mix of heavy rain and hail in the most intense portion of the storm. Note also the convergence (red/outbund velocities to the southeast; green/inbound velocities to the northwest near the reflectivity gradient of the supercell in Doylestown. As the storm's outflow continues to become stronger (via an intensifying cold pool associated with the downdraft), the supercell will continue to lose its (discrete) character. Figure 21: Same as Fig. 1, valid at 2111 UTC on 29 May 2019. The strongest winds are between Souderton and Doylestown, with continued lower CC and ZDR in the Souderton vicinity. Figure 22: Same as Fig. 1, valid at 2114 UTC on 29 May 2019. The strongest winds are just west of Doylestown, with the most intense portion of the precipitation now entering Bucks County.
Environment Environment Environment
Figure 23: Same as Fig. 1, valid at 2117 UTC on 29 May 2019. The microburst is progressing toward the southwest side of Doylestown at this point, with some indication of lower CC and ZDR approaching the west side of Doylestown as well (an indication of hail mixing with rain). Note also the high ZDR south of Lambertville, an indication of very large raindrops. Figure 24: Same as Fig. 1, valid at 2119 UTC on 29 May 2019. The most intense precipitation is now just southwest of Doylestown, with the strongest winds just east of that precipitation core. Figure 25: Same as Fig. 1, valid at 2122 UTC on 29 May 2019. The rain/hail core had reached Doylestown, and the strongest winds are likely occurring in the Doylestown area at this time. Widespread wind damage was reported here, as well as hail up to quarter size.