Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 37, NWS Philadelphia/Mount Holly

April 21, 20207 counties in New Jersey; Bucks County, Montgomery County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 21, 2020, 1:28 PM EDT for 7 counties in New Jersey; Bucks County, Montgomery County, Philadelphia County, Pennsylvania. It was in force for 32 min. 6 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 21, 2020, 1:28 PM EDT (17:28 UTC)
Expired: Apr 21, 2020, 2:00 PM EDT
In force: 32 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Burlington County, NJ, Camden County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Morris County, NJ, Somerset County, NJ, Bucks County, PA, Montgomery County, PA, Philadelphia County, PA

What was reported inside it

Time	Report	Where	Remark
Apr 21, 1:58 PM EDT	TSTM WND DMG	2 Nw Feltonville, PA	DOWNED WIRES NEAR KEMBLE PARK. TIME ESTIMATED FROM RADAR.
Apr 21, 2:00 PM EDT	HAIL 0.25	Feasterville-Trevose, PA	REPORTED AT FEASTERVILLE-TREVOSE.
Apr 21, 2:02 PM EDT	TSTM WND DMG	3 E Lawrenceville, NJ	SEVERAL TREES DOWN NEAR QUAKERBRIDGE MALL. TIME ESTIMATED FROM RADAR.
Apr 21, 2:07 PM EDT	HAIL 0.25	Bensalem, PA	PEA SIZED HAIL REPORTED IN BENSALEM, PA.
Apr 21, 2:07 PM EDT	HAIL 0.25	Langhorne, PA	PEA SIZED HAIL REPORTED IN LANGHORNE, PA.
Apr 21, 2:10 PM EDT	TSTM WND GST 44	2 Ssw Palmyra, NJ	NJ MESONET MEASURES 44 MPH.

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 21, 1:27 PM EDT	Severe Thunderstorm Watch	SPC	3 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 5.5 hours before the alert went out and 147 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: 3 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 846 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 221 m²/s²
0-3 km storm-relative helicity: 296 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

567 
WUUS51 KPHI 211728
SVRPHI
NJC005-007-019-021-023-027-035-PAC017-091-101-211800-
/O.NEW.KPHI.SV.W.0037.200421T1728Z-200421T1800Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
128 PM EDT Tue Apr 21 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Morris County in northern New Jersey...
  Southeastern Hunterdon County in northwestern New Jersey...
  Northwestern Camden County in southern New Jersey...
  Mercer County in central New Jersey...
  Northwestern Burlington County in southern New Jersey...
  Somerset County in northern New Jersey...
  Western Middlesex County in northern New Jersey...
  Southeastern Montgomery County in southeastern Pennsylvania...
  Southeastern Bucks County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...

* Until 200 PM EDT.

* At 127 PM EDT, severe thunderstorms were located along a line
  extending from Wharton to near Washington Crossing to Lima, moving
  east at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Philadelphia, Trenton, Camden, New Brunswick, Morristown,
  Somerville, Somerset, Bensalem, East Brunswick, Bridgewater, South
  Brunswick, Mount Laurel, North Brunswick, Ewing, Willingboro,
  Dover, Madison, Hopatcong, Middlesex and Princeton.

People attending Covid-19 Drive through testing should seek safe
shelter immediately!

This includes the following highways...
 Interstate 195 in New Jersey between mile markers 0 and 7.
 Interstate 287 in New Jersey between mile markers 3 and 47.
 Interstate 295 in New Jersey between mile markers 35 and 76.
 Interstate 78 in New Jersey between mile markers 22 and 42.
 Interstate 80 in New Jersey between mile markers 29 and 48.
 Interstate 95 in Pennsylvania between mile markers 22 and 40.
 New Jersey Turnpike between exits 4 and 8, and between exits 9 and
10.
 Pennsylvania Turnpike between exits 339 and 353.
 Interstate 76 in Pennsylvania between mile markers 332 and 342.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

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

&&

LAT...LON 4091 7433 4083 7433 4076 7438 4075 7436
      4067 7446 4066 7445 4066 7440 4060 7446
      4060 7434 4025 7452 4018 7461 3988 7491
      4002 7532 4005 7534 4031 7503 4096 7463
      4091 7427 4090 7427
TIME...MOT...LOC 1727Z 278DEG 34KT 4092 7457 4030 7493 3991 7545 

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

Davis

1 follow-up statement

344 
WWUS51 KPHI 211742
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
142 PM EDT Tue Apr 21 2020

NJC005-007-019-021-023-027-035-PAC017-091-101-211800-
/O.CON.KPHI.SV.W.0037.000000T0000Z-200421T1800Z/
Morris NJ-Hunterdon NJ-Camden NJ-Mercer NJ-Burlington NJ-Somerset NJ-
Middlesex NJ-Montgomery PA-Bucks PA-Philadelphia PA-
142 PM EDT Tue Apr 21 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 PM EDT
FOR CENTRAL MORRIS...SOUTHEASTERN HUNTERDON...NORTHWESTERN CAMDEN...
MERCER...NORTHWESTERN BURLINGTON...SOMERSET...WESTERN MIDDLESEX...
SOUTHEASTERN MONTGOMERY...SOUTHEASTERN BUCKS AND PHILADELPHIA
COUNTIES...

At 142 PM EDT, severe thunderstorms were located along a line
extending from near Lake Telemark to near Richboro to Chestnut Hill,
moving east at 45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Philadelphia, Trenton, Camden, New Brunswick, Morristown, Somerville,
Somerset, Bensalem, East Brunswick, Bridgewater, South Brunswick,
Mount Laurel, North Brunswick, Ewing, Willingboro, Dover, Madison,
Middlesex, Princeton and Florence.

People attending Covid-19 Drive through testing should seek safe
shelter immediately!

This includes the following highways...
 Interstate 195 in New Jersey between mile markers 0 and 7.
 Interstate 287 in New Jersey between mile markers 3 and 47.
 Interstate 295 in New Jersey between mile markers 35 and 76.
 Interstate 78 in New Jersey between mile markers 23 and 42.
 Interstate 80 in New Jersey between mile markers 32 and 48.
 Interstate 95 in Pennsylvania between mile markers 22 and 40.
 New Jersey Turnpike between exits 4 and 8, and between exits 9 and
10.
 Pennsylvania Turnpike between exits 339 and 353.
 Interstate 76 in Pennsylvania between mile markers 332 and 342.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Protecting yourself from immediate threats to life and safety shall
take priority.  Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.

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

&&

LAT...LON 4091 7433 4083 7433 4076 7438 4075 7436
      4067 7446 4066 7445 4066 7440 4060 7446
      4060 7434 4025 7452 4018 7461 3988 7491
      4002 7532 4005 7534 4031 7503 4095 7459
      4091 7427 4090 7427
TIME...MOT...LOC 1742Z 281DEG 39KT 4100 7456 4027 7501 4008 7521 

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

Deal

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 21, 3:34 AM EDT	Freeze Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 10 more	28 hr
Apr 21, 11:44 AM EDT	Coastal Flood Statement	PHI	Ocean	5 hr
Apr 21, 12:23 PM EDT	Special Weather Statement	PHI	Monmouth	37 min
Apr 21, 1:04 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	26 min
Apr 21, 1:38 PM EDT	Special Weather Statement	PHI	Cumberland, Salem	52 min
Apr 21, 1:49 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Salem	56 min
Apr 21, 1:59 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Hunterdon, Mercer, Middlesex, Monmouth and 3 more	61 min
Apr 21, 2:04 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland	56 min
Apr 21, 2:17 PM EDT	Special Marine Warning	PHI		58 min
Apr 21, 2:24 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	66 min
Apr 21, 2:55 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Monmouth, Ocean	35 min
Apr 21, 3:04 PM EDT	Special Marine Warning	PHI		116 min
Apr 21, 12:48 PM EDT	Special Weather Statement	PHI	Bucks, Chester, Montgomery	42 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2020 Severe Thunderstorm Warnings in Pennsylvania, 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.