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Overview
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A quasi-linear convective system (QLCS) developed in the lee of the Appalachians in the late evening and early overnight hours of 14-15 April 2019 as a strong shortwave trough approached the Northeast. In advance of the QLCS, low-level instability remained unusually high as moist and strong southerly flow was well-established in the Mid-Atlantic. Within an environment of strong vertical wind shear, the QLCS developed several embedded bow echoes and mesovortices, with swaths of wind damage and a few tornadoes from southern New York to Virginia between 10 pm and 6 am. In our county warning area, the most significant severe weather occurred near the urban corridor, where several reports of straight-line wind damage were received, and in portions of Delmarva, where two tornadoes occurred.
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 Tornado Damage in Laurel, DE (Image Courtesy Joseph Thomas) |
Synoptic Overview at 12z 14 April 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 15 April 2019 (courtesy of SPC)
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| Figure 7: 250-mb analysis | Figure 8: 300-mb analysis | Figure 9: 500-mb analysis |
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| 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: 18z surface map | Figure 14: 21z surface map | Figure 15: 00z surface map |
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| Figure 16: 03z surface map | Figure 17: 06z surface map | Figure 18: 09z surface map |
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| Figure 19: 12z Wallops Island, VA sounding | Figure 20: 12z Pittsburgh, PA sounding | Figure 21: 12z Sterling, VA sounding |
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| Figure 22: 00z Wallops Island, VA sounding | Figure 23: 00z Pittsburgh, PA sounding | Figure 24: 00z Sterling, VA sounding |
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| Figure 1: National Preliminary Reports 12z 14 April 2019 to 12z 15 April 2019 | Figure 2: Zoomed Preliminary Reports -- Note the second Sussex County tornado is not in the preliminary reports. | Figure 3: Prelim Reports vs. 1630z SPC Convective Outlook |
Flash Flood Watch 0001 Areal Flood Advisory 0020 Tornado Watch 0074 Areal Flood Advisory 0021 Severe Thunderstorm Warning 0006 Areal Flood Advisory 0022 Severe Thunderstorm Warning 0007 Areal Flood Advisory 0023 Severe Thunderstorm Warning 0008 Tornado Warning 0001 Severe Thunderstorm Warning 0009 Special Marine Warning 0004 Areal Flood Advisory 0024 Severe Thunderstorm Warning 0010 Special Marine Warning 0005 Tornado Warning 0002 Wind Advisory 0007 Tornado Warning 0003 Severe Thunderstorm Warning 0011 Severe Thunderstorm Warning 0012 Tornado Warning 0004 Tornado Warning 0005 Severe Thunderstorm Warning 0013 Severe Thunderstorm Warning 0014 Special Marine Warning 0006 Severe Thunderstorm Warning 0015 Severe Thunderstorm Warning 0016 Areal Flood Advisory 0025 Special Marine Warning 0007 Special Marine Warning 0008 Special Marine Warning 0009 Areal Flood Warning 0004
NWUS51 KPHI 160838
LSRPHI
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
438 AM EDT TUE APR 16 2019
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0355 AM TSTM WND GST EASTAMPTON TWP 40.00N 74.75W
04/15/2019 E60 MPH BURLINGTON NJ NWS EMPLOYEE
0348 AM TSTM WND GST BURLINGTON 40.07N 74.86W
04/15/2019 M59 MPH BURLINGTON NJ MESONET
0340 AM TSTM WND DMG 1 SSW HADDONFIELD 39.89N 75.03W
04/15/2019 CAMDEN NJ PUBLIC
HALF OF A TREE ROUGHLY 1-2 FEET IN DIAMETER
FELL ON A CAR AND FENCE IN A RESIDENTIAL
AREA. TIME ESTIMATED FROM RADAR.
0333 AM TSTM WND DMG 1 SSE WHITMAN PARK 39.92N 75.11W
04/15/2019 CAMDEN NJ BROADCAST MEDIA
ROOF BLOWN OFF AN APARTMENT BUILDING AT S
8TH STREET AND FERRY AVENUE. TIME ESTIMATED
FROM RADAR.
0300 AM TSTM WND DMG 1 SSW BOHEMIAS MILLS 39.45N 75.79W
04/15/2019 CECIL MD 911 CALL CENTER
TREES REPORTED DOWN NEAR WARWICK. TIME
ESTIMATED FROM RADAR.
0311 AM TSTM WND GST BROOKHAVEN 39.88N 75.39W
04/15/2019 M60 MPH DELAWARE PA TRAINED SPOTTER
0356 AM TSTM WND DMG WILLIAMSTOWN 39.69N 75.00W
04/15/2019 GLOUCESTER NJ TRAINED SPOTTER
NUMEROUS TREES DOWN ACROSS THE TWP. TIME
ESTIMATED FROM RADAR.
0325 AM TSTM WND GST LOGAN TWP. 39.80N 75.35W
04/15/2019 M64 MPH GLOUCESTER NJ MESONET
0335 AM TSTM WND DMG 1 WSW MCPHERSON 40.60N 74.88W
04/15/2019 HUNTERDON NJ 911 CALL CENTER
TREES BLOWN DOWN IN CLINTON TOWNSHIP. TIME
ESTIMATED FROM RADAR.
0312 AM TSTM WND DMG MARYDEL 39.11N 75.74W
04/15/2019 KENT DE 911 CALL CENTER
TREES BLOWN DOWN IN MARYDEL. TIME ESTIMATED
FROM RADAR.
0305 AM TSTM WND DMG MILLINGTON 39.26N 75.84W
04/15/2019 KENT MD 911 CALL CENTER
TREES AND WIRES DOWN IN MILLINGTON. TIME
ESTIMATED FROM RADAR.
0536 AM FLOOD 1 W BELMAR 40.18N 74.04W
04/15/2019 ANZ450 NJ PUBLIC
FLOODING ON NJ 35 BOTH DIRECTIONS BETWEEN
SOUTH OF NJ 71/H STREET (BELMAR) AND NORTH
OF SHARK RIVER DRAWBRIDGE (NEPTUNE TWP) 1 TO
2 LANES CLOSED.
0610 AM FLOOD 2 SSE LAMBERTVILLE 40.34N 74.93W
04/15/2019 MERCER NJ DEPT OF HIGHWAYS
FLOODING ON NJ 29 BOTH DIRECTIONS AT VALLEY
RD (HOPEWELL TWP) 1 LANE MAY BE CLOSED.
0407 AM TSTM WND DMG 2 NNE WINDSOR 40.27N 74.57W
04/15/2019 MERCER NJ NWS EMPLOYEE
TREE FELL ONTO A HOUSE. TIME ESTIMATED FROM
RADAR.
0403 AM TSTM WND DMG ROBBINSVILLE TWP. 40.23N 74.64W
04/15/2019 MERCER NJ PUBLIC
ROOF BLOWN OFF OF A SHED. SEVERAL TREES
DOWN, INCLUDING ONE ONTO A VEHICLE. TIME
ESTIMATED FROM RADAR.
0400 AM TSTM WND DMG 2 W ROBBINSVILLE TWP. 40.23N 74.67W
04/15/2019 MERCER NJ PUBLIC
TREE DOWN. TIME ESTIMATED FROM RADAR.
0400 AM TSTM WND DMG 2 SSE HAMILTON TWP 40.20N 74.71W
04/15/2019 MERCER NJ DEPT OF HIGHWAYS
DOWNED TREE ON I-295 SOUTHBOUND RAMP TO
EXIT 61 - ARENA DR (HAMILTON TWP) RAMP CLOSED.
TIME ESTIMATED FROM RADAR.
0400 AM TSTM WND DMG HAMILTON TWP 40.23N 74.72W
04/15/2019 MERCER NJ PUBLIC
MULTIPLE LARGE TREES DOWN.
0422 AM TSTM WND DMG 1 E CHEESEQUAKE 40.42N 74.27W
04/15/2019 MIDDLESEX NJ PUBLIC
A ROW OF POWER POLES WERE SNAPPED ALONG
ROUTE 34 IN OLD BRIDGE. TIME ESTIMATED FROM
RADAR.
0404 AM TSTM WND DMG MIDDLESEX 40.58N 74.50W
04/15/2019 MIDDLESEX NJ BROADCAST MEDIA
TWO TREES UPROOTED IN MIDDLESEX.
0410 AM TSTM WND DMG 3 NNE EAST WINDSOR TWP 40.31N 74.52W
04/15/2019 MIDDLESEX NJ PUBLIC
NUMEROUS TREES UPROOTED AND DOWNED IN CRANBURY TWP.
TIME ESTIMATED FROM RADAR.
0601 AM FLOOD MANASQUAN 40.12N 74.05W
04/15/2019 MONMOUTH NJ DEPT OF HIGHWAYS
FLOODING ON NJ 71 BOTH DIRECTIONS SOUTH OF
MAIN ST (MANASQUAN) 1 LANE MAY BE CLOSED.
0550 AM TSTM WND DMG 1 ESE KEANSBURG 40.44N 74.12W
04/15/2019 MONMOUTH NJ DEPT OF HIGHWAYS
DOWNED TREE ON NJ 36 SOUTHBOUND THOMPSON AV
(MIDDLETOWN TWP) RIGHT LANE CLOSED.
0536 AM TSTM WND DMG 1 S STRATHMORE 40.39N 74.21W
04/15/2019 MONMOUTH NJ DEPT OF HIGHWAYS
DOWNED TREE ON NJ 34 SOUTHBOUND NORTH OF
SCHANK RD (MARLBORO TWP) ALL LANES CLOSED.
0450 AM TSTM WND GST 1 ENE MANASQUAN 40.13N 74.03W
04/15/2019 M62 MPH MONMOUTH NJ MESONET
SEA GIRT.
0442 AM MARINE TSTM WIND SANDY HOOK 40.47N 74.01W
04/15/2019 M58 MPH MONMOUTH NJ BUOY
PEAK WIND GUST OF 70 MPH.
0439 AM TSTM WND DMG MIDDLETOWN TWP 40.40N 74.10W
04/15/2019 MONMOUTH NJ BROADCAST MEDIA
MEDIA REPORTS OF DOWNED TREES IN MIDDLETOWN.
0320 AM TSTM WND DMG PORT PENN 39.52N 75.58W
04/15/2019 NEW CASTLE DE DEPT OF HIGHWAYS
THE INTERSECTION OF W MARKET ST. AND DELAWARE CITY PORT
PENN RD IS CLOSED DUE TO A UTILITY POLE AND TREE IN THE
ROADWAY. TIME ESTIMATED FROM RADAR.
0320 AM TSTM WND GST PORT PENN 39.52N 75.58W
04/15/2019 M56 MPH NEW CASTLE DE MESONET
0246 AM TSTM WND DMG 3 NW GLASGOW 39.63N 75.78W
04/15/2019 NEW CASTLE DE COCORAHS
REPORT OF A TREE CAUSING A POWER OUTAGE AT A
HOME ALONG THE MD-DE BORDER.
0542 AM TSTM WND DMG 1 NNE LAKEHURST 40.03N 74.29W
04/15/2019 OCEAN NJ DEPT OF HIGHWAYS
DOWNED WIRES ON NJ 70 BOTH DIRECTIONS EAST
OF NJ 37 (MANCHESTER TWP) ALL LANES CLOSED
AND DETOURED 10-15 MINUTE DELAY USE CAUTION.
0440 AM TSTM WND GST BERKELEY TWP 39.93N 74.30W
04/15/2019 M62 MPH OCEAN NJ MESONET
0439 AM TSTM WND GST 4 ESE ROOSEVELT CITY 39.93N 74.29W
04/15/2019 M56 MPH OCEAN NJ ASOS
MILLER AIR PARK.
0341 AM TSTM WND GST NORTHEAST PHILADELPHIA 40.09N 75.02W
04/15/2019 M58 MPH PHILADELPHIA PA ASOS
0330 AM TSTM WND DMG 1 S CENTER CITY 39.97N 75.14W
04/15/2019 PHILADELPHIA PA BROADCAST MEDIA
A TREE WAS UPROOTED IN NORTHERN LIBERTIES.
0327 AM TSTM WND GST PHILADELPHIA INTERNATIO 39.88N 75.22W
04/15/2019 M64 MPH PHILADELPHIA PA ASOS
0326 AM TSTM WND DMG 1 SE POINT BREEZE 39.93N 75.17W
04/15/2019 PHILADELPHIA PA BROADCAST MEDIA
TREES UPROOTED, INCLUDING ONE ONTO A
VEHICLE, AND A POWER POLE DOWN IN SOUTH
PHILLY. TIME ESTIMATED FROM RADAR.
0320 AM TSTM WND GST 1 SSW MANTUA 39.95N 75.20W
04/15/2019 E60 MPH PHILADELPHIA PA PUBLIC
0520 AM FLOOD 1 ESE BRIDGEWATER 40.59N 74.62W
04/15/2019 SOMERSET NJ DEPT OF HIGHWAYS
FLOODING ON US 22 WESTBOUND AREA OF CR
643/MOUNTAIN AVE (BRIDGEWATER TWP) LEFT LANE
CLOSED.
0435 AM TSTM WND GST 5 E LONG NECK 38.62N 75.07W
04/15/2019 M58 MPH SUSSEX DE MESONET
INDIAN RIVER INLET.
0429 AM TSTM WND GST DEWEY BEACH 38.69N 75.07W
04/15/2019 M54 MPH SUSSEX DE MESONET
0406 AM TSTM WND GST 5 NW LEWES 38.82N 75.20W
04/15/2019 M69 MPH SUSSEX DE PUBLIC
WIND GUST MEASURED WITH ANEMOMETER. ROOF
DAMAGE TO A BUILDING IN BROADKILL BEACH.
TIME ESTIMATED FROM RADAR.
0359 AM TSTM WND DMG 2 N HARBESON 38.74N 75.28W
04/15/2019 SUSSEX DE BROADCAST MEDIA
ROOF DAMAGE TO A MOBILE HOME AND SHED. TIME
ESTIMATED FROM RADAR.
0345 AM TSTM WND DMG 3 NNE SEAFORD 38.69N 75.59W
04/15/2019 SUSSEX DE DEPT OF HIGHWAYS
US 13 NB & SB BETWEEN CAMP RD AND BOYCE RD IS CLOSED
DUE TO WIRES DOWN. TIME ESTIMATED FROM RADAR.
0340 AM TSTM WND GST SEAFORD 38.64N 75.61W
04/15/2019 M50 MPH SUSSEX DE MESONET
0340 AM TSTM WND GST LAUREL 38.56N 75.57W
04/15/2019 M55 MPH SUSSEX DE MESONET
0338 AM TORNADO 1 E BETHEL 38.57N 75.59W
04/15/2019 SUSSEX DE NWS STORM SURVEY
*** 1 INJ ***
EF2 TORNADO CONFIRMED WITH ESTIMATED MAXIMUM
WINDS OF 120 MPH. A TORNADO CAUSED DAMAGE
ALONG A PATH FROM LAUREL TO SEAFORD
DELAWARE. A TREE FELL ON A HOUSE, CAUSING
ONE INJURY. ONE BARN WAS DESTROYED. THERE
WAS ROOF DAMAGE TO SEVERAL OTHER HOMES AND
BARNS. MANY TREES WERE UPROOTED ALONG THE
PATH AND A FEW WERE SNAPPED.
0313 AM TSTM WND DMG STILLWATER TWP 41.06N 74.86W
04/15/2019 SUSSEX NJ PUBLIC
TREES AND POWER LINES DOWN IN STILLWATER
TWP. TIME ESTIMATED FROM RADAR.
&&
$$
NOUS41 KPHI 182300 PNSPHI DEZ001>004-191100- Public Information Statement National Weather Service Mount Holly NJ 700 PM EDT Thu Apr 18 2019 ...NWS DAMAGE SURVEYS FOR 04/15/19 TORNADO EVENT... .Milton Delaware Tornado... Start Location...Harbeson in Sussex County Delaware End Location...Broadkill Beach in Sussex County Delaware Date...April 15, 2019 Estimated Time...4:00 AM EDT to 4:07 AM EDT Maximum EF-Scale Rating...EF1 Estimated Maximum Wind Speed...100 mph Maximum Path Width...50 yards Path Length...6.2 miles Beginning Lat/Lon...38.7400/-75.2788 Ending Lat/Lon...38.8147/-75.1978 * Fatalities...0 * Injuries...0 ...Summary... A tornado touched down near Carpenter Road in Harbeson. This tornado was associated with the same parent circulation that produced an EF2 tornado in Laurel, DE. Sporadic damage occurred over the remainder of the path, and the tornado may not have been on the ground continuously. Damage was observed on Shay Lane, where a few trees were snapped and a section of a barn roof was removed. Near the coast on South Bay Shore Drive, a couple of additional trees were snapped along with some roof damage. A distinct swirling pattern was also seen in a marsh grassy area at this location. Beyond this point the circulation moved offshore. Dual polarization radar data was also useful in confirming a tornado debris signature. .Updated information on Laurel Delaware Tornado... Start Location...Laurel in Sussex County Delaware End Location...Georgetown in Sussex County Delaware Date...April 15, 2019 Estimated Time...3:38 AM EDT to 3:49 AM EDT Maximum EF-Scale Rating...EF2 Estimated Maximum Wind Speed...120 mph Maximum Path Width...50 to 400 yards Path Length...9.3 miles Beginning Lat/Lon...38.5729/-75.5929 Ending Lat/Lon...38.6502/-75.4554 * Fatalities...0 * Injuries...1 ...Summary... A tornado traveled from Woodland Ferry Road northeast to Asbury Road. Numerous homes along the path sustained considerable damage to exterior walls and roofs. One home's roof was nearly completely blown off. One barn was destroyed. The tornado reached its maximum width of about 400 yard as it crossed Seaford Road in Laurel, where a few wooden power poles were snapped. One large wooden power pole was broken at the base. A tree fell on a house, resulting in one injury. Additionally, there was considerable roof and structural damage to several other barns and farm out- buildings. Many trees were uprooted along the tornado path, and a few were snapped. The damage became sporadic and somewhat discontinuous for the approximately the last 3 miles of the track. The tornado lifted as it crossed Asbury Road, where it rolled a mobile home onto its side. The National Weather Service would like to extend our thanks to Sussex County Emergency Management for their assistance in this damage survey. 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. $$ Milton Tornado...O'Brien/Staarmann Laurel Tornado...Davis/SFJ/Staarmann
Sussex (DE) County Tornadoes (GR2Analyst)
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| Figure 1: Animated KDOX radar imagery of the Seaford, DE, tornado on 15 April 2019. Base reflectivity (top left), storm-relative motion (top right), correlation coefficient (bottom left) and differential reflectivity (bottom right) from 0734 to 0758 UTC. Note the very low correlation coefficient values collocated with strong rotation and an embedded hook signature in radar reflectivity -- a clear indication of a tornadic debris signature | Figure 2: Same as Fig. 1, valid at 0756 to 0809 UTC 15 April 2019. This signature is more subtle, but there is rapidly converging rotation and a subtle lowering of correlation coefficient where the tornado was confirmed from a storm survey. |
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