Overview
A strong upper-level trough approached the Mid-Atlantic during the afternoon of 26 April 2019. An attendant cold front swept through the area during the afternoon and evening. A line of intense storms developed along the front in the Appalachians and progressed eastward through the area between 3 and 8 pm. Embedded within the line were multiple bowing segments, indicative of strong wind gusts reaching the surface. Wind damage occurred in several locations in southeast Pennsylvania, southwest New Jersey, and Delmarva in association with the line of storms. The most severe damage occurred in the Narberth (PA) and Cherry Hill (NJ) areas, where numerous instances of downed trees and roof damage were reported. As the line approached the cooler ocean waters during the mid-evening hours, the storms quickly weakened (aided by the loss of daytime heating).
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KDIX Radar Loop during the afternoon/evening of 26 April 2019. |
Synoptic Overview at 12z 26 April 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 27 April 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 Wallops Island, VA sounding |
Figure 22: 00z Upton, NY sounding | Figure 23: 00z Sterling, VA sounding | Figure 24: 00z Wallops Island, VA sounding |
Figure 1: National Preliminary Reports 12z 26 April 2019 to 12z 27 April 2019 | Figure 2: Zoomed Preliminary Reports for the same period. | Figure 3: Prelim Reports vs. 1630z SPC Convective Outlook |
Special Marine Warning 0017 Tornado Watch 0105 Special Marine Warning 0018 Areal Flood Advisory 0034 Areal Flood Advisory 0035 Special Marine Warning 0019 Severe Thunderstorm Warning 0018 Special Marine Warning 0020 Tornado Warning 0006 Tornado Warning 0007 Severe Thunderstorm Warning 0019 Severe Thunderstorm Warning 0020 Special Marine Warning 0021 Severe Thunderstorm Warning 0021 Areal Flood Advisory 0036 Severe Thunderstorm Warning 0022 Areal Flood Advisory 0037 Special Marine Warning 0022 Severe Thunderstorm Warning 0023 Severe Thunderstorm Warning 0024 Severe Thunderstorm Warning 0025 Severe Thunderstorm Warning 0026 Severe Thunderstorm Warning 0027 Special Marine Warning 0023 Areal Flood Advisory 0038 Areal Flood Advisory 0039 Areal Flood Advisory 0040 Special Marine Warning 0024
NWUS51 KPHI 272029 LSRPHI PRELIMINARY LOCAL STORM REPORT...SUMMARY NATIONAL WEATHER SERVICE MOUNT HOLLY NJ 429 PM EDT SAT APR 27 2019 ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 0711 PM MARINE TSTM WIND 1 E BARNEGAT LIGHT 39.76N 74.09W 04/26/2019 M46 MPH ANZ451 NJ MESONET THE BARNEGAT ISLAND LIGHT WXFLOW SENSOR REPORTED A GUST OF 40 KNOTS. 0624 PM MARINE TSTM WIND STONE HARBOR 39.06N 74.77W 04/26/2019 M46 MPH ANZ453 NJ MESONET STONE HARBOR HADS SENSOR MEASURED A GUST OF 40 KNOTS. 0619 PM TSTM WND DMG COLUMBUS 40.08N 74.72W 04/26/2019 BURLINGTON NJ PUBLIC SMALL TREES AND POWER LINES DOWN. IMAGES SHARED WITH US ON SOCIAL MEDIA. TIME ESTIMATED FROM RADAR. 0617 PM TSTM WND DMG 1 W PROSPECT PARK 40.24N 74.79W 04/26/2019 MERCER NJ TRAINED SPOTTER LARGE TREE DOWN IN PARK. TIME ESTIMATED FROM RADAR. 0612 PM TSTM WND DMG 1 NNE VILLAS 39.04N 74.93W 04/26/2019 CAPE MAY NJ TRAINED SPOTTER TREE SPLIT AND INTO WIRES ON BAYSHORE ROAD. TIME ESTIMATED FROM RADAR. 0610 PM TSTM WND DMG RANCOCAS 40.01N 74.87W 04/26/2019 BURLINGTON NJ PUBLIC TREES AND LARGE LIMBS REPORTED TO BE DOWN AND TO HAVE KNOCKED OUT POWER LINES. TIME ESTIMATED FROM RADAR. 0551 PM TSTM WND DMG ELLISBURG 39.92N 75.00W 04/26/2019 CAMDEN NJ NEWSPAPER REPORTS OF WIND DAMAGE IN THE ELLISBURG AREA. TREES WERE UPROOTED AND CAUSED PROPERTY DAMAGE AT ONE RESIDENCE ON MAINE AVENUE. TIME ESTIMATED FROM RADAR. 0550 PM TSTM WND DMG 2 SE WARMINSTER TWP. 40.18N 75.06W 04/26/2019 BUCKS PA DEPT OF HIGHWAYS DOWNED TREE AND WIRES ON PA-132 EASTBOUND AT DAVISVILLE ROAD. ONE LANE IS BLOCKED. TIME ESTIMATED FROM RADAR. 0549 PM TSTM WND DMG WARMINSTER 40.21N 75.10W 04/26/2019 BUCKS PA PUBLIC SEVERAL TREES AND A FEW POWER LINES DOWN IN WARMINSTER. TIME ESTIMATED FROM RADAR. 0549 PM TSTM WND DMG 1 NE HADDONFIELD 39.91N 75.01W 04/26/2019 CAMDEN NJ PUBLIC SEVERAL REPORTS OF WIND DAMAGE BETWEEN CHERRY HILL AND HADDONFIELD, INCLUDING AT THE CONNECT CHURCH, ON KNOLLWOOD DRIVE, ON CORNELL AVENUE, AND ON MASSACHUSETTS AVENUE. NUMEROUS TREES AND POWER LINES DOWN, SEVERAL OF WHICH RESULTED IN PROPERTY DAMAGE. 0545 PM TSTM WND DMG ROCKLEDGE 40.08N 75.09W 04/26/2019 MONTGOMERY PA FIRE DEPT/RESCUE DOWNED TREE NEAR THE INTERSECTION OF MONTGOMERY AVENUE AND CENTRAL AVENUE. TIME ESTIMATED FROM RADAR. 0545 PM TSTM WND DMG RICHLANDTOWN 40.47N 75.32W 04/26/2019 BUCKS PA PUBLIC TREES DOWN. TIME ESTIMATED FROM RADAR. 0545 PM TSTM WND DMG 1 E CHERRY HILL 39.93N 75.01W 04/26/2019 CAMDEN NJ PUBLIC LARGE TREE UPROOTED AND FELL ACROSS RHODE ISLAND AVENUE IN CHERRY HILL. TIME ESTIMATED FROM RADAR. 0544 PM TSTM WND DMG 1 NE COLLINGSWOOD 39.93N 75.06W 04/26/2019 CAMDEN NJ NEWSPAPER DOWNED TREES CLOSED CUTHBERT BOULEVARD AND PARK BOULEVARD NEAR CROWNE PLAZA. TIME ESTIMATED FROM RADAR. 0544 PM TSTM WND DMG 1 NNW PHILADELPHIA 40.02N 75.14W 04/26/2019 PHILADELPHIA PA FIRE DEPT/RESCUE TREE UPROOTED AND BLOCKING THE ROADWAY NEAR THE INTERSECTION OF TWINING ROAD AND DALE ROAD. TIME ESTIMATED FROM RADAR. 0542 PM TSTM WND DMG 1 S ELKINS PARK 40.06N 75.13W 04/26/2019 MONTGOMERY PA PUBLIC DOWNED TREES AND POWER LINES NEAR MELROSE PARK STATION. TIME ESTIMATED FROM RADAR. 0540 PM TSTM WND DMG 1 SW ELKINS PARK 40.06N 75.14W 04/26/2019 PHILADELPHIA PA PUBLIC DOWNED TREE DAMAGED A HOUSE IN WEST OAK LANE. TIME ESTIMATED FROM RADAR. 0537 PM TSTM WND DMG 1 SSE LOGAN TWP. 39.79N 75.34W 04/26/2019 GLOUCESTER NJ DEPT OF HIGHWAYS TREE DOWN ON US 322 EASTBOUND WEST OF I-295 IN LOGAN TOWNSHIP. LANES ARE BLOCKED. TIME ESTIMATED FROM RADAR. 0535 PM MARINE TSTM WIND FORTESCUE 39.24N 75.18W 04/26/2019 M41 MPH ANZ430 NJ MESONET WINDS OF 36 KNOTS REPORTED AT FORTESCUE NJWXNET SITE. 0533 PM TSTM WND DMG MANAYUNK 40.02N 75.22W 04/26/2019 PHILADELPHIA PA PUBLIC DOWNED TREES AT AND NEAR BOONE PARK. TIME ESTIMATED FROM RADAR. 0532 PM TSTM WND GST PHILADELPHIA INTERNATIO 39.88N 75.23W 04/26/2019 M47 MPH PHILADELPHIA PA ASOS 0531 PM TSTM WND DMG 1 SE ARDMORE 40.00N 75.28W 04/26/2019 MONTGOMERY PA FIRE DEPT/RESCUE DOWNED TREE AT MIDFIELD ROAD AND LAKESIDE ROAD INTERSECTION, WITH ROADS BLOCKED. TIME ESTIMATED FROM RADAR. 0531 PM TSTM WND DMG NARBERTH 40.01N 75.26W 04/26/2019 MONTGOMERY PA FIRE DEPT/RESCUE DOWNED TREE NEAR THE INTERSECTION OF FORREST AVENUE AND WINDSOR AVENUE. TIME ESTIMATED FROM RADAR. 0531 PM TSTM WND DMG BELMONT HILLS 40.02N 75.23W 04/26/2019 MONTGOMERY PA BROADCAST MEDIA SEVERAL TREES AND POWER LINES DOWN IN BALA CYNWYD. TIME ESTIMATED FROM RADAR. 0531 PM TSTM WND GST PHILADELPHIA INTERNATIO 39.88N 75.23W 04/26/2019 E62 MPH PHILADELPHIA PA OTHER FEDERAL CORRECTS PREVIOUS TSTM WND GST REPORT FROM PHILADELPHIA INTERNATIONAL AIRPORT. PHL ITWS MEASURED A WIND GUST TO 54 KNOTS. 0530 PM TSTM WND DMG 1 S BRYN MAWR 40.02N 75.32W 04/26/2019 MONTGOMERY PA BROADCAST MEDIA TRAIN STUCK DUE TO TREES AND WIRES DOWN ON THE SEPTA TRACKS NEAR BRYN MAWR. TIME ESTIMATED FROM RADAR. 0530 PM TSTM WND DMG 1 SSE NARBERTH 40.00N 75.26W 04/26/2019 MONTGOMERY PA FIRE DEPT/RESCUE DOWNED TREE BLOCKING THE ROADWAY NEAR THE INTERSECTION OF BOWMAN AVENUE AND KENMORE ROAD. TIME ESTIMATED FROM RADAR. 0529 PM TSTM WND DMG PENN WYNNE 39.98N 75.28W 04/26/2019 MONTGOMERY PA FIRE DEPT/RESCUE DOWNED TREE AT INTERSECTION OF MANOA ROAD AND TRENT ROAD. TIME ESTIMATED FROM RADAR. 0528 PM TSTM WND DMG ALLOWAY 39.56N 75.35W 04/26/2019 SALEM NJ TRAINED SPOTTER MULTIPLE TREES DOWN AND SHED DESTROYED. 0518 PM MARINE TSTM WIND 6 ESE WOODLAND BEACH 39.31N 75.38W 04/26/2019 M46 MPH ANZ430 DE MESONET SHIP JOHN SHOAL BUOY MEASURED A GUST OF 40 KNOTS. 0514 PM TSTM WND DMG 1 NNW LIMA 39.93N 75.45W 04/26/2019 DELAWARE PA 911 CALL CENTER DOWNED TREE ON WIRES NEAR THE INTERSECTION OF MIDDLETOWN ROAD AND FORGE ROAD IN MIDDLETOWN TWP. TIME ESTIMATED FROM RADAR. 0505 PM TSTM WND GST 4 SSW ELSINBORO TWP 39.48N 75.54W 04/26/2019 M60 MPH SALEM NJ MESONET MEASURED AT LOWER ALLOWAYS CREEK. 0458 PM TSTM WND DMG SMYRNA 39.30N 75.61W 04/26/2019 KENT DE PUBLIC LARGE TREES DOWN, SOME CAUSING PROPERTY DAMAGE. TIME ESTIMATED FROM RADAR. 0453 PM TSTM WND DMG ODESSA 39.46N 75.66W 04/26/2019 NEW CASTLE DE TRAINED SPOTTER MULTIPLE LARGE TREES DAMAGED INCLUDING SOME TREES SPLIT. 0452 PM TSTM WND GST TOWNSEND 39.39N 75.69W 04/26/2019 M59 MPH NEW CASTLE DE TRAINED SPOTTER 0445 PM TSTM WND GST KENTON 39.23N 75.66W 04/26/2019 M45 MPH KENT DE MESONET 0445 PM TSTM WND DMG 2 WNW SAINT GEORGES 39.57N 75.69W 04/26/2019 NEW CASTLE DE BROADCAST MEDIA SEVERAL TREES WERE BLOWN DOWN IN A MOBILE HOME PARK. TIME ESTIMATED FROM RADAR. 0444 PM TSTM WND DMG AVONDALE 39.82N 75.78W 04/26/2019 CHESTER PA BROADCAST MEDIA A LARGE TREE DAMAGED A HOME AND TRAPPED TWO INSIDE. NO INJURIES REPORTED. TIME ESTIMATED FROM RADAR. 0441 PM TSTM WND DMG 1 S AVONDALE 39.81N 75.78W 04/26/2019 CHESTER PA FIRE DEPT/RESCUE TREE DOWN NEAR INTERSECTION OF ELLICOTT ROAD AND COOPER ROAD. TIME ESTIMATED FROM RADAR. 0436 PM TSTM WND DMG SUDLERSVILLE 39.19N 75.85W 04/26/2019 QUEEN ANNES MD EMERGENCY MNGR EMERGENCY SERVICES REPORTS TREES DOWN AROUND THE AREA. TIME ESTIMATED FROM RADAR. 0435 PM TSTM WND GST 2 N GALENA 39.37N 75.88W 04/26/2019 M50 MPH CECIL MD MESONET MEASURED IN FREDERICKTOWN. 0432 PM TSTM WND DMG 1 N CRUMPTON 39.26N 75.93W 04/26/2019 KENT MD PUBLIC TREE DAMAGE AT A HOME NEAR ROUTE 290 AND 291. IRRIGATION SYSTEM ACROSS THE STREET COLLAPSED. 0432 PM TSTM WND DMG 3 WNW SUDLERSVILLE 39.20N 75.90W 04/26/2019 QUEEN ANNES MD DEPT OF HIGHWAYS DOWNED TREES AND BLOWN DEBRIS CLOSED U.S. HIGHWAY 301 NEAR DUDLEY CONNERS ROAD. TIME ESTIMATED FROM RADAR. 0428 PM TSTM WND DMG CARVILLE 39.05N 76.01W 04/26/2019 QUEEN ANNES MD DEPT OF HIGHWAYS DOWNED TREES AND BLOWN DEBRIS FORCED LANE RESTRICTIONS ON U.S. HIGHWAY 301 AT STATE HIGHWAY 305. TIME ESTIMATED FROM RADAR. 0426 PM TSTM WND DMG 3 NW HAMBLETON 38.73N 76.10W 04/26/2019 TALBOT MD NEWSPAPER TREE DOWN ON WIRES ON OLD COUNTRY CLUB ROAD. TIME ESTIMATED FROM RADAR. 0356 PM MARINE TSTM WIND 1 E BARNEGAT LIGHT 39.76N 74.09W 04/26/2019 M42 MPH ANZ451 NJ MESONET THE BARNEGAT ISLAND LIGHT WXFLOW SENSOR REPORTED A WIND GUST OF 36.5 KNOTS. && $$ TCD
Narberth Microburst (GR2Analyst)
Figure 1: KDIX radar reflectivity factor (top left), base velocity (top right), correlation coefficient (bottom left), and differential reflectivity (bottom right) valid at 2121 UTC on 26 April 2019. Note the appearance of the line of storms bowing out between Media and Narberth, PA. This is a strong indication of strong winds aloft descending toward the surface. | Figure 2: Same as Fig. 1, valid at 2126 UTC on 26 April 2019. Base velocities have increased considerably to the southwest of Narberth, to the point where velocity folding has occurred (in which the colors switch from green to red (or vice versa) whenever the velocities exceed a threshold value). |
Figure 3: Same as Fig. 1, valid at 2131 UTC on 26 April 2019. The strong surface winds have reached Narberth by this time. | Figure 4: Same as Fig. 1, valid at 2135 UTC on 26 April 2019. The winds are beginning to diminish as the storm continues northeastward into Philadelphia County. |
Cherry Hill Microburst (GR2Analyst)
Figure 5: Same as Fig. 1, valid at 2144 UTC on 26 April 2019. Note the bowing segment near Haddonfield. This has a similar appearance to the Narberth case. | Figure 6: Same as Fig. 1, valid at 2149 UTC on 26 April 2019. Base velocities are increasing just upstream of the bowing segment (near and just northeast of Haddonfield). |
Figure 7: Same as Fig. 1, valid at 2153 UTC on 26 April 2019. Base velocities continue to increase northeast of Haddonfield, coinciding with fairly widespread wind damage near Cherry Hill. | Figure 8: Same as Fig. 1, valid at 2158 UTC on 26 April 2019. The base velocities begin to decrease as the storm enters Burlington County. |