Lake effect snow will continue into the weekend as two more quick moving systems will bring widespread snow to the Upper Great Lakes. High winds are expected across portions of Montana through the weekend. Below normal temperatures will remain in place across much of the southern and eastern U.S., while the western U.S. will experience above normal temperatures. Read More >
Overview
Scattered thunderstorms developed in a broad region of moist and unstable air in the Appalachians and Mid-Atlantic, aided by a midlevel shortwave trough ejecting northeastward from the Ohio Valley. Deep-layer shear was sufficient for storm organization in the form of clusters and even isolated supercells. Additionally, the atmosphere was quite unstable during the afternoon and evening, allowing for the development of strong updrafts capable of generating hail. Sporadic instances of wind damage and marginally severe hail occurred in the Poconos, northwest New Jersey, the Lehigh Valley, and adjacent areas to the south and east during the evening hours. A brief EF1 tornado developed in Bucks County late in the evening as well. This event posed a particular challenge to the office, as the KDIX Doppler radar had a severe hardware failure and was unavailable for this event.
|
Composite radar loop during the afternoon/evening of 19 May 2019. |
Synoptic Overview at 12z 19 May 2019 (courtesy of SPC)
Figure 1: 250-mb analysis | Figure 2: 300-mb analysis | Figure 3: 500-mb analysis |
Figure 4: 700-mb analysis | Figure 5: 850-mb analysis | Figure 6: 925-mb analysis |
Synoptic Overview at 00z 20 May 2019 (courtesy of SPC)
Figure 7: 250-mb analysis | Figure 8: 300-mb analysis | Figure 9: 500-mb analysis |
Figure 10: 700-mb analysis | Figure 11: 850-mb analysis | Figure 12: 925-mb analysis |
Surface Maps (courtesy of WPC)
Figure 13: 15z surface map | Figure 14: 18z surface map | Figure 15: 21z surface map |
Figure 16: 00z surface map | Figure 17: 03z surface map | Figure 18: 06z surface map |
Figure 19: 12z Upton, NY sounding | Figure 20: 12z Sterling, VA sounding | Figure 21: 12z Pittsburgh, PA sounding |
Figure 22: 00z Upton, NY sounding | Figure 23: 00z Sterling, VA sounding | Figure 24: 00z Pittsburgh, VA sounding |
Figure 1: National Preliminary Reports 12z 19 May 2019 to 12z 20 May 2019 | Figure 2: Zoomed Preliminary Reports for the same period. | Figure 3: Prelim Reports vs. 1630z SPC Convective Outlook |
Severe Thunderstorm Watch 0193 Severe Thunderstorm Warning 0030 Severe Thunderstorm Warning 0031 Severe Thunderstorm Warning 0032 Severe Thunderstorm Warning 0033 Severe Thunderstorm Warning 0034 Tornado Warning 0008 Severe Thunderstorm Warning 0035 Severe Thunderstorm Warning 0036 Severe Thunderstorm Warning 0037 Areal Flood Advisory 0050 Severe Thunderstorm Warning 0038 Severe Thunderstorm Warning 0039 Severe Thunderstorm Warning 0040 Areal Flood Advisory 0051 Areal Flood Advisory 0052
NWUS51 KPHI 201524 LSRPHI PRELIMINARY LOCAL STORM REPORT...SUMMARY NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 1124 AM EDT MON MAY 20 2019 ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 1230 AM TSTM WND DMG 1 NW DENVILLE 40.87N 74.50W 05/20/2019 MORRIS NJ TRAINED SPOTTER MULTIPLE LARGE TREES UPROOTED AND SEVERAL SMALL PINE TREES SNAPPED. 1136 PM HAIL BRODHEADSVILLE 40.93N 75.39W 05/19/2019 E1.00 INCH MONROE PA TRAINED SPOTTER NICKEL TO QUARTER SIZE HAIL. 0951 PM TORNADO 2 NE OTTSVILLE 40.49N 75.14W 05/19/2019 BUCKS PA NWS STORM SURVEY A STORM SURVEY TEAM DETERMINED A TORNADO BRIEFLY TOUCHED DOWN OVER THE BEAVER VALLEY CAMPGROUNDS IN TINICUM TOWNSHIP, BUCKS COUNTY, PA NEAR OTTSVILLE ON SUNDAY EVENING. THE TORNADO TRACKED FROM SOUTHWEST TO NORTHEAST ACROSS THE PROPERTY FOR APPROXIMATELY ONE QUARTER OF A MILE WITH A MAXIMUM PATH WIDTH OF ABOUT 100 YARDS. THE TORNADO WAS ON THE GROUND FOR APPROXIMATELY ONE MINUTE. DOZENS OF TREES WERE UPROOTED WITH SEVERAL TREES SNAPPED IN A MANNER CONSISTENT WITH TORNADIC WINDS. THE TORNADO REACHED ITS MAXIMUM WIDTH AND INTENSITY NEAR THE END OF ITS PATH WHERE THREE CAMPING TRAILERS WERE SIGNIFICANTLY DAMAGED BY FALLEN TREES. 0947 PM FLOOD 1 SSW LAURELDALE 40.37N 75.93W 05/19/2019 BERKS PA FIRE DEPT/RESCUE ROUTE 12 BETWEEN ROUTE 61 AND N 5TH STREET HIGHWAY CLOSED DUE TO FLOODING. 0946 PM TSTM WND DMG POHATCONG TWP 40.65N 75.14W 05/19/2019 WARREN NJ 911 CALL CENTER NUMEROUS TREES AND POWER LINES REPORTED DOWN ACROSS THE TOWNSHIP. 0940 PM TSTM WND DMG 2 S GLENDON 40.64N 75.24W 05/19/2019 NORTHAMPTON PA BROADCAST MEDIA *** 1 INJ *** LARGE TREE DOWN ONTO A HOUSE IN THE 2700 BLOCK OF MORGAN HILL ROAD IN WILLIAMS TOWNSHIP. A SECTION OF THE HOME WAS ESSENTIALLY DESTROYED. A WOMAN IN THE HOME HAD MINOR INJURIES. TIME ESTIMATED FROM RADAR. 0917 PM TSTM WND DMG BOYERTOWN 40.33N 75.64W 05/19/2019 BERKS PA FIRE DEPT/RESCUE TREE AND POWER LINES DOWN ON E PHILADELPHIA AVENUE. TIME ESTIMATED FROM RADAR. 0915 PM FLOOD WYOMISSING 40.34N 75.96W 05/19/2019 BERKS PA FIRE DEPT/RESCUE WATER RESCUE UNDER THE RAILROAD BRIDGE AT STATE HILL ROAD. 0915 PM TSTM WND DMG 1 WNW WASHINGTON TWP 40.40N 75.61W 05/19/2019 BERKS PA FIRE DEPT/RESCUE TREE DOWN ON WIRES ON FORGE DALE ROAD. TIME ESTIMATED FROM RADAR. 0914 PM TSTM WND DMG 1 SSE BECHTELSVILLE 40.36N 75.62W 05/19/2019 BERKS PA FIRE DEPT/RESCUE TREE DOWN ON TOWNSHIP LINE ROAD 1 MILE FROM ROUTE 100. TIME ESTIMATED FROM RADAR. 0910 PM LIGHTNING 1 ENE WERNERSVILLE 40.33N 76.07W 05/19/2019 BERKS PA FIRE DEPT/RESCUE LIGHTNING STRIKE TO A RESIDENCE ON N PENN DRIVE. 0901 PM TSTM WND DMG 1 WNW TEMPLE 40.41N 75.94W 05/19/2019 BERKS PA FIRE DEPT/RESCUE TREE DOWN IN BERN TWP NEAR ROUTE 61 AND CROSS KEYS ROAD. TIME ESTIMATED FROM RADAR. 0857 PM HAIL SINKING SPRING 40.33N 76.02W 05/19/2019 E1.00 INCH BERKS PA PUBLIC QUARTER SIZE HAIL AND ESTIMATED 30-40 MPH WIND GUSTS REPORTED IN SINKING SPRING. TIME ESTIMATED FROM RADAR. 0851 PM TSTM WND GST LAURELDALE 40.39N 75.92W 05/19/2019 E60 MPH BERKS PA TRAINED SPOTTER TRAINED SPOTTER ESTIMATED 60 TO 65 MPH WIND GUSTS WITH VERY HEAVY RAINFALL AND NO HAIL. 0844 PM FLOOD LAURELDALE 40.39N 75.92W 05/19/2019 BERKS PA FIRE DEPT/RESCUE NORTH 5TH STREET HIGHWAY CLOSED AT THE ARBYS DUE TO FLOOD WATERS. 0831 PM TSTM WND DMG 1 N EXETER TWP 40.33N 75.84W 05/19/2019 BERKS PA FIRE DEPT/RESCUE LARGE TREE DOWN ACROSS OLEY TURNPIKE ROAD BETWEEN WOODS LANE AND RITTERS LANE. ROAD IS COMPLETELY BLOCKED AND LOVE POWER LINES ARE DOWN. 0826 PM HAIL WYOMISSING 40.33N 75.96W 05/19/2019 E1.00 INCH BERKS PA PUBLIC DIME TO QUARTER SIZE HAIL IN THE WYOMISSING AREA. 0820 PM TSTM WND DMG BERN TWP 40.39N 76.00W 05/19/2019 BERKS PA FIRE DEPT/RESCUE TREE AND OTHER DEBRIS DOWN ON ROUTE 222 AT TULPEHOCKEN BRIDGE. TIME ESTIMATED FROM RADAR. 0813 PM TSTM WND DMG 2 ENE SOUTH HEIDELBERG 40.30N 76.04W 05/19/2019 BERKS PA FIRE DEPT/RESCUE TREE DOWN ON A RESIDENCE ON MILLER ROAD. 0810 PM TSTM WND DMG 1 N HEIDELBERG TWP 40.38N 76.17W 05/19/2019 BERKS PA FIRE DEPT/RESCUE MULTIPLE TREES AND POWER POLES DOWN. TIME ESTIMATED FROM RADAR. 0805 PM TSTM WND DMG 3 W BRANCHVILLE 41.15N 74.81W 05/19/2019 SUSSEX NJ 911 CALL CENTER TREE DOWN ON E SHORE ROAD NEAR LAKE OWASSA. TIME ESTIMATED FROM RADAR. 0800 PM TSTM WND DMG 1 NNE SANDYSTON TWP 41.23N 74.82W 05/19/2019 SUSSEX NJ 911 CALL CENTER TREE DOWN ON LAYTON-HAINESVILLE ROAD IN SANDYSTON TWP. TIME ESTIMATED FROM RADAR. 0715 PM TSTM WND DMG POCONO TWP 41.04N 75.30W 05/19/2019 MONROE PA 911 CALL CENTER TREE DOWN ON TRAILER WITH OCCUPANTS IN POCONO TWP. NO KNOWN INJURIES AT THIS TIME. STADDEN RD ALSO CLOSED WITH TREE DOWN. 0655 PM TSTM WND DMG KIDDER TWP 41.07N 75.72W 05/19/2019 CARBON PA 911 CALL CENTER TREE DOWN IN KIDDER TWP. 0650 PM LIGHTNING 1 NNW MAHONING TWP 40.82N 75.76W 05/19/2019 CARBON PA BROADCAST MEDIA LIGHTNING STRIKE TO A GARAGE ON HEMLOCK DRIVE IN MAHONING TOWNSHIP RESULTING IN A FIRE. AT LEAST 5 STRUCTURES WERE HIT BY LIGHTNING IN CARBON COUNTY. 0648 PM TSTM WND DMG TOWAMENSING TWP 40.88N 75.58W 05/19/2019 CARBON PA PUBLIC TREE DOWN IN TOWAMENSING TWP. 0640 PM TSTM WND DMG JIM THORPE 40.88N 75.73W 05/19/2019 CARBON PA 911 CALL CENTER TREE DOWN IN JIM THORPE TWP. && $$ GORSE/STAARMANN/TCD
NOUS41 KPHI 231441 PNSPHI NJZ007-009-010-015-017>019-027-PAZ054-055-060>062-070-071-101>106- 240245- Public Information Statement National Weather Service Mount Holly NJ 1041 AM EDT Thu May 23 2019 ...NWS DAMAGE SURVEY FOR 05/19/19 BUCKS COUNTY PA TORNADO... Start Location...Tinicum Township in Bucks County PA End Location...Tinicum Township in Bucks County PA Date...May 19, 2019 Estimated Time...9:51 PM EDT Maximum EF-Scale Rating...EF1 Estimated Maximum Wind Speed...95 mph Maximum Path Width...100 yards Path Length...0.25 miles Beginning Lat/Lon...40.4929/-75.1404 Ending Lat/Lon...40.4951/-75.1363 * Fatalities...0 * Injuries...0 ...Summary... A storm survey team determined a tornado briefly touched down over the Beaver Valley Campgrounds in Tinicum Township, Bucks County, PA near Ottsville on Sunday evening. The tornado tracked from southwest to northeast across the property for approximately one quarter of a mile with a maximum path width of about 100 yards. The tornado was on the ground for approximately one minute. Dozens of trees were uprooted with several trees snapped in a manner consistent with tornadic winds. The tornado reached its maximum width and intensity near the end of its path where three camping trailers were significantly damaged by fallen trees. Fortunately, no injuries were reported as a result of this tornado. EF Scale: The Enhanced Fujita Scale classifies tornadoes into the following categories: EF0...Weak......65 to 85 mph EF1...Weak......86 to 110 mph EF2...Strong....111 to 135 mph EF3...Strong....136 to 165 mph EF4...Violent...166 to 200 mph EF5...Violent...>200 mph * The information in this statement is preliminary and subject to change pending final review of the event and publication in NWS Storm Data. $$ Kruzdlo/O'Brien/Staarmann
Berks County Hail (GR2Analyst)
Figure 1: KCCX radar reflectivity factor (top left), base velocity (top right), correlation coefficient (bottom left), and differential reflectivity (bottom right) valid at 0024 UTC on 20 May 2019. Note the position of a red marker on the four-panel plot. This is approximately the location on radar where large hail is indicated. A lowering of correlation coefficient beyond (east-southeast) of the marker is potentially indicative of a three-body scatter spike and non-uniform beam filling, both of which (can) indicate the presence of hail. Indeed, quarter-sized hail was reported at around this time. | Figure 2: Same as Fig. 1, valid at 0055 UTC on 20 May 2019. The combination of high radar reflectivity factor, low differential reflectivity, a lowering of correlation coefficient (particularly near and southeast of the indicated marker), and divergence (as indicated by red base velocities to the west-northwest of green velocities) suggest the presence of a descending hail core. Quarter-sized hail was reported at Sinking Spring in Berks County at this time. |
Bucks County Tornado (GR2Analyst)
Figure 3: Same as Fig. 1, valid at 0151 UTC on 20 May 2019 (storm-relative velocities are shown instead of base velocities). A brief tornado occurred in Bucks County at this time, though there is little evidence of this from radar (owing to its long distance from KCCX). The KDIX radar outage prevented inspection of the storm at a much lower elevation. |