Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 27, NWS Philadelphia/Mount Holly

April 10, 20208 counties in New Jersey; Kent County, New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 10, 2020, 12:16 AM EDT for 8 counties in New Jersey; Kent County, New Castle County, Delaware. It was in force for 14 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 10, 2020, 12:16 AM EDT (04:16 UTC)
Expired: Apr 10, 2020, 12:30 AM EDT
In force: 14 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Kent County, DE, New Castle County, DE, Atlantic County, NJ, Burlington County, NJ, Camden County, NJ, Cape May County, NJ, Cumberland County, NJ, Gloucester County, NJ, Ocean County, NJ, Salem County, NJ

The radar

The Philadelphia radar (KDIX), 77 km from the middle of the area, began a volume at 04:19 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 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.
Apr 10, 12:30 AM EDT	TSTM WND DMG	2 Ese Millville, NJ	MPING REPORT OF TREE LIMBS DOWN AND SHINGLES BLOWN OFF. TIME ESTIMATED FROM RADAR.
Apr 10, 12:30 AM EDT	TSTM WND DMG	2 S Minotola, NJ	MPING REPORT OF TREE LIMBS DOWN AND SHINGLES BLOWN OFF. TIME ESTIMATED FROM RADAR.
Apr 10, 12:39 AM EDT	TSTM WND DMG	Laurel Lake, NJ	DOWNED TREES AND POWER LINES. TIME ESTIMATED FROM RADAR.

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

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 00:00Z, 4.3 hours before the alert went out and 163 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: 2111 m above ground
0-6 km bulk shear: 85 kt
0-1 km storm-relative helicity: -80 m²/s²
0-3 km storm-relative helicity: 169 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

736 
WUUS51 KPHI 100416
SVRPHI
DEC001-003-NJC001-005-007-009-011-015-029-033-100430-
/O.NEW.KPHI.SV.W.0027.200410T0416Z-200410T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
1216 AM EDT Fri Apr 10 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  South central New Castle County in northern Delaware...
  Northern Kent County in central Delaware...
  Atlantic County in southern New Jersey...
  Cumberland County in southern New Jersey...
  Southeastern Salem County in southern New Jersey...
  South central Ocean County in southern New Jersey...
  Southeastern Camden County in southern New Jersey...
  Southeastern Gloucester County in southern New Jersey...
  Cape May County in southern New Jersey...
  Southeastern Burlington County in southern New Jersey...

* Until 1230 AM EDT.

* At 1215 AM EDT, severe thunderstorms were located along a line
  extending from Mullica Hill to near Quinton to near Warwick, moving
  east at 65 mph.

  HAZARD...70 mph wind gusts and small hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Vineland, Atlantic City, Dover, Millville, Bridgeton, Ocean City,
  Cape May, Cumberland, Pleasantville, Glassboro, Hammonton, Somers
  Point, Ventnor City, Smyrna, Brigantine, Northfield, Absecon,
  Berlin, Margate City and Buena.

This includes the following highways...
 Atlantic City Expressway between mile markers 0 and 42.
 Garden State Parkway between mile markers 0 and 57.

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 3932 7417 3922 7427 3910 7447 3887 7464
      3896 7534 3931 7576 3947 7525 3981 7500
      3955 7399
TIME...MOT...LOC 0415Z 290DEG 56KT 3975 7523 3949 7537 3937 7571 

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, 11:44 PM EDT	Special Marine Warning	PHI		61 min
Apr 9, 11:49 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Cumberland, Gloucester, Salem	41 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, 3:33 AM EDT	Freeze Watch	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	12 hr
Apr 10, 3:29 PM EDT	Freeze Warning	PHI	Hunterdon, Mercer, Morris, Somerset, Sussex, Warren	18 hr
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 Delaware, 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.