Alert archive / New Jersey / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 12, NWS Philadelphia/Mount Holly

April 1, 2023Chester County, Delaware County, Pennsylvania; Cumberland County, Gloucester County, Salem County, New Jersey; Kent County, New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 1, 2023, 6:39 PM EDT for Chester County, Delaware County, Pennsylvania; Cumberland County, Gloucester County, Salem County, New Jersey; Kent County, New Castle County, Delaware. It was in force for 51 min. 9 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 1, 2023, 6:39 PM EDT (22:39 UTC)
Expired: Apr 1, 2023, 7:30 PM EDT
In force: 51 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Tornado: Possible
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Kent County, DE, New Castle County, DE, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA

The radar

The Dover AFB radar (KDOX), 93 km from the middle of the area, began a volume at 22:39 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 1, 6:48 PM EDT	TSTM WND DMG	Colonial Heights, DE	TREE INTO HOUSE ON NORTH CLEVELAND ROAD. TIME ESTIMATED VIA RADAR.
Apr 1, 6:49 PM EDT	HAIL 0.5	1 E Glasgow, DE	REPORT FROM MPING: HALF-INCH (0.50 IN.).
Apr 1, 6:50 PM EDT	TSTM WND DMG	1 Nw Nottingham Manor, DE	NWS STORM SURVEY FOUND SPORADIC STRAIGHT LINE WIND DAMAGE CONTINUING INTO NEW CASTLE COUNTY TO BE NOT ASSOCIATED WITH THE UPSTREAM TORNADO WHICH HAD DISSIPATED IN CECIL COUNTY. TIME ESTIMATED FROM RADAR.
Apr 1, 6:50 PM EDT	TSTM WND DMG	Newark, DE	MULTIPLE TREES INTO HOUSES REPORTED IN NEWARK. TIME ESTIMATED VIA RADAR.
Apr 1, 6:50 PM EDT	HAIL 0.5	1 E Glasgow, DE	REPORT FROM MPING: HALF-INCH (0.50 IN.).
Apr 1, 7:00 PM EDT	TSTM WND DMG	Castle Hills, DE	TREES DOWN INTO A HOUSE ON WARDOR AVE. TIME ESTIMATED VIA RADAR.
Apr 1, 7:07 PM EDT	TSTM WND DMG	Pennsville, NJ	TREE DOWN ON RIVIERA DRIVE NEAR BOSTON ROAD. TIME ESTIMATED VIA RADAR.
Apr 1, 7:17 PM EDT	TSTM WND GST 60	Woodstown, NJ	TRAINED SPOTTER REPORTS 60 MPH GUST. TIME ESTIMATED VIA RADAR.
Apr 1, 7:30 PM EDT	HAIL 0.75	1 Sw Pitman, NJ	REPORT FROM MPING: DIME (0.75 IN.).

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 1, 5:30 PM EDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 10.7 hours before the alert went out and 170 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: 648 m above ground
0-6 km bulk shear: 48 kt
0-1 km storm-relative helicity: 448 m²/s²
0-3 km storm-relative helicity: 443 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

787 
WUUS51 KPHI 012239
SVRPHI
DEC001-003-NJC011-015-033-PAC029-045-012330-
/O.NEW.KPHI.SV.W.0012.230401T2239Z-230401T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
639 PM EDT Sat Apr 1 2023

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  New Castle County in northern Delaware...
  North central Kent County in central Delaware...
  Northwestern Cumberland County in southern New Jersey...
  Salem County in southern New Jersey...
  Central Gloucester County in southern New Jersey...
  South central Chester County in southeastern Pennsylvania...
  Southwestern Delaware County in southeastern Pennsylvania...

* Until 730 PM EDT.

* At 639 PM EDT, severe thunderstorms were located along a line
  extending from near Marshallton to Charlestown, moving southeast at
  45 mph.

  HAZARD...70 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Wilmington, Dover, Newark, Bridgeton, Middletown, Chester,
  Glassboro, Pennsville, Smyrna, Pitman, Carneys Point, Elsmere,
  Kennett Square, New Castle, Penns Grove, Salem, Woodstown, Alloway,
  Clayton and West Grove.

This includes the following highways...
 New Jersey Turnpike between exits 1 and 2.
 Interstate 95 in Pennsylvania between mile markers 0 and 4.
 Interstate 95 in Delaware between mile markers 0 and 23.
 Interstate 295 in New Jersey between mile markers 0 and 16.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM EDT for central and
northern Delaware...southern New Jersey...and southeastern
Pennsylvania.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

A Tornado Watch remains in effect until 1000 PM EDT for central and
northern Delaware...southern New Jersey...and southeastern
Pennsylvania.

&&

LAT...LON 3996 7568 3971 7499 3916 7550 3934 7576
      3962 7579 3972 7579 3972 7592
TIME...MOT...LOC 2239Z 303DEG 41KT 3992 7567 3959 7598 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Staarmann

1 follow-up statement

929 
WWUS51 KPHI 012313
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
713 PM EDT Sat Apr 1 2023

PAC029-012322-
/O.CAN.KPHI.SV.W.0012.000000T0000Z-230401T2330Z/
Chester PA-
713 PM EDT Sat Apr 1 2023

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL CHESTER COUNTY
IS CANCELLED...

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

A Tornado Watch remains in effect until 1000 PM EDT for central and
northern Delaware...southern New Jersey...and southeastern
Pennsylvania.

LAT...LON 3985 7538 3971 7499 3916 7550 3934 7576
      3953 7578
TIME...MOT...LOC 2312Z 269DEG 39KT 3972 7526 3939 7569 

$$

DEC001-003-NJC011-015-033-PAC045-012330-
/O.CON.KPHI.SV.W.0012.000000T0000Z-230401T2330Z/
New Castle DE-Kent DE-Cumberland NJ-Salem NJ-Gloucester NJ-
Delaware PA-
713 PM EDT Sat Apr 1 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM EDT
FOR NEW CASTLE...NORTH CENTRAL KENT...NORTHWESTERN CUMBERLAND...
SALEM...CENTRAL GLOUCESTER AND SOUTH CENTRAL DELAWARE COUNTIES...

At 712 PM EDT, severe thunderstorms were located along a line
extending from Mullica Hill to near Middletown, moving east at 45
mph.

HAZARD...70 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Wilmington, Dover, Bridgeton, Middletown, Chester, Glassboro,
Pennsville, Smyrna, Pitman, Carneys Point, New Castle, Penns Grove,
Salem, Woodstown, Alloway, Clayton, Quinton, Swedesboro, Delaware
City and Elmer.

This includes the following highways...
 New Jersey Turnpike between exits 1 and 2.
 Interstate 295 in New Jersey between mile markers 0 and 16.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM EDT for central and
northern Delaware...southern New Jersey...and southeastern
Pennsylvania.

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

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

&&

LAT...LON 3985 7538 3971 7499 3916 7550 3934 7576
      3953 7578
TIME...MOT...LOC 2312Z 269DEG 39KT 3972 7526 3939 7569 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 1, 5:27 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Carbon, Lehigh, Northampton	48 min
Apr 1, 5:53 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery, Northampton	67 min
Apr 1, 6:04 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware, Montgomery	56 min
Apr 1, 6:33 PM EDT	Tornado Warning	PHI	Chester	27 min
Apr 1, 6:37 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	53 min
Apr 1, 6:45 PM EDT	Tornado Warning	PHI	Bucks	30 min
Apr 1, 6:57 PM EDT	Tornado Warning	PHI	Philadelphia	33 min
Apr 1, 7:11 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Philadelphia	64 min
Apr 1, 6:18 PM EDT	Special Marine Warning	PHI		87 min
Apr 1, 6:18 PM EDT	Special Weather Statement	PHI	Morris	42 min
Apr 1, 6:31 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Mercer, Middlesex, Morris, Somerset	44 min
Apr 1, 7:05 PM EDT	Special Marine Warning	PHI		55 min
Apr 1, 7:07 PM EDT	Tornado Warning	PHI	Burlington, Mercer, Monmouth, Ocean	38 min
Apr 1, 7:24 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Atlantic, Cape May, Cumberland, Gloucester, Salem	51 min
Apr 1, 7:26 PM EDT	Special Marine Warning	PHI		64 min
Apr 1, 7:27 PM EDT	Special Marine Warning	PHI		93 min
Apr 1, 7:31 PM EDT	Tornado Warning	PHI	Monmouth, Ocean	29 min
Apr 1, 7:33 PM EDT	Tornado Warning	PHI	Burlington, Ocean	27 min
Apr 1, 7:47 PM EDT	Special Marine Warning	PHI		88 min
Apr 1, 7:52 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Atlantic, Burlington, Cape May, Cumberland, Ocean	38 min
Apr 1, 5:38 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	37 min
Apr 1, 6:01 PM EDT	Tornado Warning	PHI	Kent, Sussex	29 min
Apr 1, 6:22 PM EDT	Tornado Warning Tornado observed	PHI	Sussex	23 min
Apr 1, 6:58 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	47 min
Apr 1, 7:20 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Kent	40 min
Apr 1, 7:36 PM EDT	Severe Thunderstorm Warning Considerable damage threat	PHI	Kent, Sussex	39 min
Apr 1, 7:50 PM EDT	Severe Thunderstorm Warning	PHI	Kent, Sussex	40 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2023 Severe Thunderstorm Warnings in Pennsylvania, 2023 Severe Thunderstorm Warnings in Delaware, 2023 Every severe thunderstorm warning in 2023

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.