Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 26, NWS Philadelphia/Mount Holly

April 9, 20204 states

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 9, 2020, 11:49 PM EDT for 4 states. It was in force for 41 min. 21 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Apr 9, 2020, 11:49 PM EDT (03:49 UTC)
Expired: Apr 10, 2020, 12:30 AM EDT
In force: 41 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Kent County, DE, New Castle County, DE, Cecil County, MD, Kent County, MD, Camden County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA, Philadelphia County, PA

The radar

The Dover AFB radar (KDOX), 84 km from the middle of the area, began a volume at 03:51 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
Apr 9, 11:50 PM EDT	TSTM WND DMG	1 Ne White Clay Creek, DE	DOWNED TREES AND WIRES NEAR THE INTERSECTION OF UPPER PIKE CREEK ROAD AND SPRING SIDE LANE. TIME ESTIMATED FROM RADAR.
Apr 9, 11:50 PM EDT	TSTM WND DMG	Landenberg, PA	SEVERAL REPORTS OF DOWNED TREES AND POWER LINES IN THE WEST GROVE AND LANDENBERG AREAS. TIME ESTIMATED FROM RADAR.
Apr 9, 11:50 PM EDT	HAIL 0.25	North East, MD	TIME ESTIMATED FROM RADAR.
Apr 9, 11:52 PM EDT	TSTM WND DMG	1 N Landenberg, PA	DOWNED TREE ON LAUREL HEIGHTS ROAD. TIME ESTIMATED FROM RADAR.
Apr 9, 11:52 PM EDT	TSTM WND DMG	2 Wnw Hyde Park, DE	DOWNED TREES AND WIRES NEAR THE INTERSECTION OF MILLCREEK ROAD AND VALLEY BROOK DRIVE. TIME ESTIMATED FROM RADAR.
Apr 9, 11:52 PM EDT	TSTM WND DMG	Elkton, MD	DOWNED TREE AT A RESIDENCE. SMALL HAIL ALSO REPORTED. REPORT FROM SOCIAL MEDIA. TIME ESTIMATED FROM RADAR.
Apr 9, 11:52 PM EDT	TSTM WND DMG	Ladenberg, PA	DOWNED WIRES NEAR THE INTERSECTION OF CHESTERVILLE ROAD AND PENN GREEN ROAD. TIME ESTIMATED FROM RADAR.
Apr 9, 11:53 PM EDT	TSTM WND DMG	Glen Westover, MD	DOWNED TREES AND POWER LINES. TIME ESTIMATED FROM RADAR.
Apr 9, 11:58 PM EDT	TSTM WND DMG	Glasgow, DE	SEVERAL REPORTS OF TREES AND POWER LINES DOWN NEAR GLASGOW AND WOODSIDE MANOR. TIME ESTIMATED FROM RADAR.
Apr 10, 12:00 AM EDT	TSTM WND DMG	Garfield Park, DE	SEVERAL REPORTS OF TREES AND POWER LINES DOWN NEAR MEMORIAL DRIVE.
Apr 10, 12:00 AM EDT	TSTM WND DMG	Wilmington Manor, DE	SEVERAL REPORTS OF TREES AND WIRES DOWN NEAR CHELSEA MANOR PARK. TIME ESTIMATED FROM RADAR.
Apr 10, 12:00 AM EDT	TSTM WND GST 69	New Castle Airport (Kil, DE
Apr 10, 12:03 AM EDT	TSTM WND DMG	Pennsville, NJ	DOWNED TREE AT A RESIDENCE. REPORT VIA SOCIAL MEDIA. TIME ESTIMATED FROM RADAR.
Apr 10, 12:03 AM EDT	TSTM WND DMG	Wilmington, DE	DOWNED TREES AND WIRES NEAR THE INTERSECTION OF WEST SECOND STREET AND NORTH ADAMS STREET. TIME ESTIMATED FROM RADAR.
Apr 10, 12:06 AM EDT	TSTM WND DMG	Penns Grove, NJ	SEVERAL REPORTS OF DOWNED POWER LINES FROM PENNS GROVE TO PENNSVILLE.
Apr 10, 12:06 AM EDT	MARINE TSTM WIND 54	1 Nne Delaware City, DE
Apr 10, 12:10 AM EDT	TSTM WND DMG	1 Ssw Salem, NJ	SEVERAL REPORTS OF POWER POLES AND WIRES DOWN IN AND NEAR SALEM. TIME ESTIMATED FROM RADAR.
Apr 10, 12:15 AM EDT	TSTM WND GST 61	4 Ssw Elsinboro Twp, NJ	NJWXNET SENSOR.
Apr 10, 12:20 AM EDT	TSTM WND DMG	Greenwich Twp., NJ	SEVERAL REPORTS OF DOWNED POWER LINES IN THE AREA. TIME ESTIMATED FROM SOCIAL MEDIA AND RADAR.
Apr 10, 12:25 AM EDT	TSTM WND DMG	Bridgeton, NJ	SEVERAL REPORTS OF POWER LINES DOWN. TIME ESTIMATED FROM RADAR.
Apr 10, 12:25 AM EDT	TSTM WND GST 59	2 Nne Seabrook Farms, NJ	NJWXNET SENSOR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 3.8 hours before the alert went out and 146 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1936 m above ground
0-6 km bulk shear: 97 kt
0-1 km storm-relative helicity: -34 m²/s²
0-3 km storm-relative helicity: 59 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

343 
WUUS51 KPHI 100349
SVRPHI
DEC001-003-MDC015-029-NJC007-011-015-033-PAC029-045-101-100430-
/O.NEW.KPHI.SV.W.0026.200410T0349Z-200410T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1149 PM EDT Thu Apr 9 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  New Castle County in northern Delaware...
  Northwestern Kent County in central Delaware...
  Northeastern Kent County in northeastern Maryland...
  Cecil County in northeastern Maryland...
  Northwestern Cumberland County in southern New Jersey...
  Salem County in southern New Jersey...
  West central Camden County in southern New Jersey...
  Gloucester County in southern New Jersey...
  Southeastern Chester County in southeastern Pennsylvania...
  Southwestern Philadelphia County in southeastern Pennsylvania...
  Southern Delaware County in southeastern Pennsylvania...

* Until 1230 AM EDT.

* At 1148 PM EDT, severe thunderstorms were located along a line
  extending from near Coatesville to Pleasant Hill to near Bel Air
  South, moving east at 60 mph.

  HAZARD...60 mph wind gusts and small hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is 
           possible.

* Locations impacted include...
  Philadelphia, Wilmington, Vineland, Newark, Millville, Bridgeton,
  Middletown, West Chester, Elkton, Chester, Deptford, West Deptford,
  Glassboro, Lindenwold, Pennsville, Bellmawr, Westtown, Woodbury,
  Smyrna and Pitman.

This includes the following highways...
 Atlantic City Expressway between mile markers 38 and 44.
 Interstate 295 in New Jersey between mile markers 0 and 26.
 Interstate 95 in Pennsylvania between mile markers 0 and 13.
 Interstate 95 in Maryland between mile markers 91 and 109.
 New Jersey Turnpike between exits 1 and 2.
 Interstate 95 in Delaware between mile markers 0 and 23.
 Interstate 476 in Pennsylvania between mile markers 0 and 3.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3937 7611 3937 7606 3942 7600 3946 7601
      3952 7598 3955 7603 3955 7608 3959 7611
      3966 7593 3999 7575 3983 7493 3941 7506
      3922 7568 3933 7615
TIME...MOT...LOC 0348Z 289DEG 51KT 3993 7579 3967 7593 3955 7627 

HAIL...<.75IN
WIND...60MPH
 
$$

Robertson

1 follow-up statement

698 
WWUS51 KPHI 100410
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
1210 AM EDT Fri Apr 10 2020

PAC029-100419-
/O.CAN.KPHI.SV.W.0026.000000T0000Z-200410T0430Z/
Chester PA-
1210 AM EDT Fri Apr 10 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CHESTER COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 3937 7611 3937 7606 3942 7600 3946 7601
      3960 7568 3993 7544 3983 7493 3942 7506
      3939 7511 3922 7567 3933 7614
TIME...MOT...LOC 0409Z 289DEG 51KT 3983 7543 3957 7557 3945 7591 

$$

DEC001-003-MDC015-029-NJC007-011-015-033-PAC045-101-100430-
/O.CON.KPHI.SV.W.0026.000000T0000Z-200410T0430Z/
New Castle DE-Kent DE-Kent MD-Cecil MD-Cumberland NJ-Salem NJ-
Camden NJ-Gloucester NJ-Philadelphia PA-Delaware PA-
1210 AM EDT Fri Apr 10 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM EDT
FOR NEW CASTLE...NORTHWESTERN KENT...NORTHEASTERN KENT...SOUTHEASTERN
CECIL...NORTHWESTERN CUMBERLAND...SALEM...WEST CENTRAL CAMDEN...
GLOUCESTER...SOUTHWESTERN PHILADELPHIA AND SOUTHEASTERN DELAWARE
COUNTIES...

At 1209 AM EDT, severe thunderstorms were located along a line
extending from Chester Township to Delaware City to near Hollywood
Beach, moving east at 60 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
Philadelphia, Wilmington, Vineland, Millville, Bridgeton, Middletown,
Chester, Deptford, West Deptford, Glassboro, Lindenwold, Pennsville,
Bellmawr, Woodbury, Smyrna, Pitman, Carneys Point, Berlin, Folcroft
and Swarthmore.

This includes the following highways...
 Atlantic City Expressway between mile markers 38 and 44.
 Interstate 295 in New Jersey between mile markers 0 and 26.
 Interstate 95 in Pennsylvania between mile markers 0 and 13.
 New Jersey Turnpike between exits 1 and 2.
 Interstate 95 in Delaware between mile markers 11 and 23.
 Interstate 476 in Pennsylvania between mile markers 0 and 3.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

This is a DANGEROUS SITUATION. These storms are producing widespread 
wind damage. SEEK SHELTER NOW inside a sturdy structure and stay 
away from windows. 

This severe thunderstorm may contain little or no lightning. Do not 
wait until you hear thunder before taking cover.

&&

LAT...LON 3937 7611 3937 7606 3942 7600 3946 7601
      3960 7568 3993 7544 3983 7493 3942 7506
      3939 7511 3922 7567 3933 7614
TIME...MOT...LOC 0409Z 289DEG 51KT 3983 7543 3957 7557 3945 7591 

HAIL...<.75IN
WIND...70MPH
 
$$

Robertson

The office that day

Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 9, 11:24 PM EDT	Severe Thunderstorm Warning	PHI	Chester	36 min
Apr 9, 11:54 PM EDT	Special Weather Statement	PHI	Lehigh	36 min
Apr 10, 3:33 AM EDT	Freeze Watch	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	12 hr
Apr 10, 3:29 PM EDT	Freeze Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	18 hr
Apr 9, 11:44 PM EDT	Special Marine Warning	PHI		61 min
Apr 10, 12:16 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	14 min
Apr 10, 12:18 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	57 min
Apr 10, 12:33 AM EDT	Special Marine Warning	PHI		57 min
Apr 10, 1:06 AM EDT	Special Marine Warning	PHI		54 min
Apr 10, 1:44 AM EDT	Special Marine Warning	PHI		61 min
Apr 10, 1:47 AM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	13 min
Apr 10, 3:27 AM EDT	Special Weather Statement	PHI	Morris, Sussex	63 min
Apr 10, 3:43 PM EDT	Fire Weather Watch	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	12 hr

Nearby

Severe Thunderstorm Warnings in New Jersey, 2020 Severe Thunderstorm Warnings in Pennsylvania, 2020 Severe Thunderstorm Warnings in Maryland, 2020 Every severe thunderstorm warning in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.