Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 253, NWS Philadelphia/Mount Holly

August 25, 2020Cumberland County, Salem County, New Jersey; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 25, 2020, 5:35 PM EDT for Cumberland County, Salem County, New Jersey; New Castle County, Delaware. It was in force for 40 min. 1 report 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: Aug 25, 2020, 5:35 PM EDT (21:35 UTC)
Expired: Aug 25, 2020, 6:15 PM EDT
In force: 40 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties New Castle County, DE, Cumberland County, NJ, Salem County, NJ

The radar

The Dover AFB radar (KDOX), 92 km from the middle of the area, began a volume at 21:38 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
Aug 25, 5:44 PM EDT	TSTM WND GST 45	New Castle Airport (Kil, DE

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
Aug 25, 3:34 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.6 hours before the alert went out and 183 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: 573 J/kg
Mixed-layer CIN: -96 J/kg
Mixed-layer LCL: 1117 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 176 m²/s²
0-3 km storm-relative helicity: 176 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted.

695 
WUUS51 KPHI 252135
SVRPHI
DEC003-NJC011-033-252215-
/O.NEW.KPHI.SV.W.0253.200825T2135Z-200825T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
535 PM EDT Tue Aug 25 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northern New Castle County in northern Delaware...
  Northwestern Cumberland County in southern New Jersey...
  Salem County in southern New Jersey...

* Until 615 PM EDT.

* At 535 PM EDT, a severe thunderstorm was located over Stanton, or
  near Newark, moving southeast at 40 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible. Wind damage to 
           roofs, siding, trees, and power lines is possible.

* Locations impacted include...
  Wilmington, Newark, Pennsville, Carneys Point, Elsmere, New Castle,
  Salem, Woodstown, Alloway, Quinton, Delaware City, Elmer, Newport,
  Shiloh, Stanton, North Star, Delaware Memorial Bridge, Hancocks
  Bridge, Wilmington Manor and Pike Creek.

This includes the following highways...
 New Jersey Turnpike near exit 1.
 Interstate 95 in Delaware between mile markers 4 and 13.
 Interstate 295 in New Jersey between mile markers 0 and 4.

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 3977 7573 3964 7516 3961 7512 3941 7531
      3969 7579
TIME...MOT...LOC 2135Z 297DEG 33KT 3970 7567 

HAIL...1.00IN
WIND...60MPH
 
$$

JEO

3 follow-up statements

310 
WWUS51 KPHI 252147
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
547 PM EDT Tue Aug 25 2020

DEC003-252156-
/O.CAN.KPHI.SV.W.0253.000000T0000Z-200825T2215Z/
New Castle DE-
547 PM EDT Tue Aug 25 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN NEW CASTLE COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
northern Delaware...and southern New Jersey.

LAT...LON 3971 7551 3964 7516 3961 7512 3941 7531
      3955 7555 3957 7558 3957 7559 3958 7558
      3958 7560 3959 7559 3960 7561
TIME...MOT...LOC 2146Z 297DEG 33KT 3965 7555 

$$

NJC011-033-252215-
/O.CON.KPHI.SV.W.0253.000000T0000Z-200825T2215Z/
Cumberland NJ-Salem NJ-
547 PM EDT Tue Aug 25 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR NORTHWESTERN CUMBERLAND AND SALEM COUNTIES...

At 546 PM EDT, a severe thunderstorm was located over New Castle, or
near Wilmington, moving southeast 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...
Wilmington, Pennsville, Carneys Point, Salem, Woodstown, Alloway,
Quinton, Delaware City, Elmer, Shiloh, Delaware Memorial Bridge,
Hancocks Bridge, Seabrook Farms and Olivet.

This includes the following highways...
 New Jersey Turnpike near exit 1.
 Interstate 295 in New Jersey between mile markers 0 and 3.

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 3971 7551 3964 7516 3961 7512 3941 7531
      3955 7555 3957 7558 3957 7559 3958 7558
      3958 7560 3959 7559 3960 7561
TIME...MOT...LOC 2146Z 297DEG 33KT 3965 7555 

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

JEO

782 
WWUS51 KPHI 252203
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
603 PM EDT Tue Aug 25 2020

NJC011-033-252215-
/O.CON.KPHI.SV.W.0253.000000T0000Z-200825T2215Z/
Cumberland NJ-Salem NJ-
603 PM EDT Tue Aug 25 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR NORTHWESTERN CUMBERLAND AND SOUTHWESTERN SALEM COUNTIES...

At 603 PM EDT, a severe thunderstorm was located over Alloway, or 12
miles northwest of Bridgeton, moving southeast 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...
Pennsville, Salem, Alloway, Quinton, Shiloh, Hancocks Bridge,
Seabrook Farms and Olivet.

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 3963 7548 3958 7523 3955 7517 3941 7531
      3953 7553 3958 7557
TIME...MOT...LOC 2203Z 297DEG 33KT 3958 7536 

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

JEO

879 
WWUS51 KPHI 252210
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
610 PM EDT Tue Aug 25 2020

NJC011-033-252220-
/O.EXP.KPHI.SV.W.0253.000000T0000Z-200825T2215Z/
Cumberland NJ-Salem NJ-
610 PM EDT Tue Aug 25 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CUMBERLAND AND
SOUTHWESTERN SALEM COUNTIES WILL EXPIRE AT 615 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 1100 PM EDT for
southern New Jersey.

LAT...LON 3963 7548 3958 7523 3955 7517 3941 7531
      3953 7553 3958 7557
TIME...MOT...LOC 2210Z 297DEG 33KT 3956 7530 

$$

JEO

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 25, 4:43 PM EDT	Special Weather Statement	PHI	Sussex	47 min
Aug 25, 4:49 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	26 min
Aug 25, 5:36 PM EDT	Special Marine Warning	PHI		54 min
Aug 25, 5:57 PM EDT	Severe Thunderstorm Warning	PHI	Warren	18 min
Aug 25, 6:10 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Salem	50 min
Aug 25, 6:13 PM EDT	Special Weather Statement	PHI	Middlesex, Morris, Somerset	47 min
Aug 25, 6:33 PM EDT	Special Marine Warning	PHI		57 min
Aug 25, 6:56 PM EDT	Severe Thunderstorm Warning	PHI	Cape May, Cumberland	43 min
Aug 25, 7:28 PM EDT	Special Marine Warning	PHI		24 min
Aug 25, 5:50 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	40 min
Aug 25, 6:31 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	19 min
Aug 25, 7:15 PM EDT	Special Weather Statement	PHI	Kent	45 min

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.