Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 160, NWS Philadelphia/Mount Holly

July 9, 2021New Castle County, Delaware; Cumberland County, Gloucester County, Salem County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 9, 2021, 6:57 PM EDT for New Castle County, Delaware; Cumberland County, Gloucester County, Salem County, New Jersey. It was in force for 63 min. 2 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: Jul 9, 2021, 6:57 PM EDT (22:57 UTC)
Expired: Jul 9, 2021, 8:00 PM EDT
In force: 63 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, Gloucester County, NJ, Salem County, NJ

The radar

The Philadelphia radar (KDIX), 82 km from the middle of the area, began a volume at 23:01 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
Jul 9, 7:45 PM EDT	TSTM WND DMG	1 Sw Washington Twp, NJ	LAW ENFORCEMENT REPORTS TREES DOWN ON ROADWAY IN WASHINGTON TOWNSHIP.
Jul 9, 7:48 PM EDT	TSTM WND DMG	Franklin Twp, NJ	TREE DOWN ON WIRES IN FRANKLIN TOWNSHIP.

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 12:00Z, 11.0 hours before the alert went out and 193 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: 712 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

795 
WUUS51 KPHI 092257
SVRPHI
DEC003-NJC011-015-033-100000-
/O.NEW.KPHI.SV.W.0160.210709T2257Z-210710T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
657 PM EDT Fri Jul 9 2021

The National Weather Service in Mount Holly NJ has issued a

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

* Until 800 PM EDT.

* At 657 PM EDT, severe thunderstorms were located along a line
  extending from near Carneys Point to Delaware City to Mount
  Pleasant, moving east at 35 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, Vineland, Millville, Bridgeton, Glassboro, Pennsville,
  Pitman, Clayton, Carneys Point, New Castle, Penns Grove, Salem,
  Woodstown, Alloway, Quinton, Swedesboro, Delaware City, Elmer,
  Greenwich and Shiloh.

This includes the following highways...
 New Jersey Turnpike between exits 1 and 2.
 Interstate 295 in New Jersey between mile markers 0 and 10.
 Atlantic City Expressway between mile markers 43 and 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3958 7572 3963 7562 3974 7551 3980 7508
      3980 7507 3979 7509 3978 7508 3979 7506
      3977 7504 3960 7503 3931 7513 3951 7575
TIME...MOT...LOC 2257Z 262DEG 29KT 3970 7541 3958 7557 3951 7568 

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

Staarmann

3 follow-up statements

895 
WWUS51 KPHI 092319
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
719 PM EDT Fri Jul 9 2021

DEC003-NJC011-015-033-100000-
/O.CON.KPHI.SV.W.0160.000000T0000Z-210710T0000Z/
New Castle DE-Cumberland NJ-Salem NJ-Gloucester NJ-
719 PM EDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR CENTRAL NEW CASTLE...NORTHWESTERN CUMBERLAND...SALEM AND CENTRAL
GLOUCESTER COUNTIES...

At 719 PM EDT, severe thunderstorms were located along a line
extending from Swedesboro to near Elmer to near Port Penn, moving
east 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...
Vineland, Millville, Bridgeton, Glassboro, Pennsville, Pitman,
Clayton, Carneys Point, Salem, Woodstown, Alloway, Quinton,
Swedesboro, Delaware City, Elmer, Greenwich, Shiloh, Franklinville,
Hancocks Bridge and Newport Meadows.

This includes the following highways...
 New Jersey Turnpike between exits 1 and 2.
 Interstate 295 in New Jersey between mile markers 4 and 10.
 Atlantic City Expressway between mile markers 43 and 44.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3961 7551 3975 7543 3980 7508 3979 7509
      3978 7508 3979 7506 3977 7504 3960 7503
      3931 7513 3949 7569 3955 7569
TIME...MOT...LOC 2319Z 263DEG 35KT 3975 7529 3960 7522 3952 7552 

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

Staarmann

113 
WWUS51 KPHI 092337
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
737 PM EDT Fri Jul 9 2021

DEC003-092346-
/O.CAN.KPHI.SV.W.0160.000000T0000Z-210710T0000Z/
New Castle DE-
737 PM EDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL NEW CASTLE COUNTY IS
CANCELLED...

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

LAT...LON 3954 7554 3959 7531 3972 7535 3980 7508
      3979 7509 3978 7508 3979 7506 3978 7505
      3960 7503 3931 7513 3945 7556
TIME...MOT...LOC 2336Z 266DEG 25KT 3967 7520 3956 7514 3946 7543 

$$

NJC011-015-033-100000-
/O.CON.KPHI.SV.W.0160.000000T0000Z-210710T0000Z/
Cumberland NJ-Salem NJ-Gloucester NJ-
737 PM EDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR NORTHWESTERN CUMBERLAND...SALEM AND CENTRAL GLOUCESTER
COUNTIES...

At 736 PM EDT, severe thunderstorms were located along a line
extending from near Mullica Hill to near Olivet to near Newport
Meadows, moving east at 30 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...
Vineland, Millville, Bridgeton, Glassboro, Pitman, Clayton, Salem,
Woodstown, Alloway, Quinton, Elmer, Greenwich, Shiloh, Franklinville,
Hancocks Bridge, Newport Meadows, Olivet, Malaga, Hope Creek and
Fairton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3954 7554 3959 7531 3972 7535 3980 7508
      3979 7509 3978 7508 3979 7506 3978 7505
      3960 7503 3931 7513 3945 7556
TIME...MOT...LOC 2336Z 266DEG 25KT 3967 7520 3956 7514 3946 7543 

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

Staarmann

555 
WWUS51 KPHI 092353
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
753 PM EDT Fri Jul 9 2021

NJC011-015-033-100000-
/O.CON.KPHI.SV.W.0160.000000T0000Z-210710T0000Z/
Cumberland NJ-Salem NJ-Gloucester NJ-
753 PM EDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM EDT
FOR NORTHWESTERN CUMBERLAND...SOUTHEASTERN SALEM AND CENTRAL
GLOUCESTER COUNTIES...

At 753 PM EDT, severe thunderstorms were located along a line
extending from near Monroe Township to Buena to Shiloh, moving east
at 35 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Vineland, Millville, Bridgeton, Glassboro, Pitman, Clayton, Alloway,
Greenwich, Shiloh, Franklinville, Olivet, Malaga, Newport Meadows,
Fairton, Cedarville, Seabrook Farms, Rosenhayn, Turnersville and
Centerton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3953 7543 3956 7514 3971 7523 3976 7505
      3960 7503 3931 7513 3941 7541
TIME...MOT...LOC 2353Z 264DEG 30KT 3966 7502 3955 7496 3946 7531 

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

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 8, 10:19 PM EDT	Areal Flood Advisory	PHI	Kent, Sussex	5 hr
Jul 8, 11:37 PM EDT	Tornado Warning	PHI	Sussex	23 min
Jul 8, 11:59 PM EDT	Tornado Warning	PHI	Sussex	12 min
Jul 9, 12:04 AM EDT	Tornado Warning	PHI	Sussex	26 min
Jul 9, 12:11 AM EDT	Tornado Warning	PHI	Sussex	35 min
Jul 9, 12:28 AM EDT	Tornado Warning	PHI	Sussex	17 min
Jul 9, 4:54 PM EDT	Special Weather Statement	PHI	New Castle	66 min
Jul 9, 5:17 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	43 min
Jul 9, 6:19 PM EDT	Severe Thunderstorm Warning	PHI	New Castle	41 min
Jul 9, 6:50 PM EDT	Areal Flood Advisory	PHI	New Castle	2 hr
Jul 8, 10:25 PM EDT	Areal Flood Advisory	PHI	Cape May, Cumberland	7 hr
Jul 8, 11:02 PM EDT	Special Marine Warning	PHI		88 min
Jul 8, 11:59 PM EDT	Areal Flood Advisory	PHI	Salem	5 hr
Jul 9, 12:07 AM EDT	Special Marine Warning	PHI		53 min
Jul 9, 12:08 AM EDT	Areal Flood Advisory	PHI	Atlantic, Camden, Gloucester	6 hr
Jul 9, 12:25 AM EDT	Special Marine Warning	PHI		95 min
Jul 9, 1:34 AM EDT	Special Marine Warning	PHI		86 min
Jul 9, 1:49 AM EDT	Special Marine Warning	PHI		26 min
Jul 9, 2:05 AM EDT	Areal Flood Advisory	PHI	Burlington, Monmouth, Ocean	8 hr
Jul 9, 2:50 AM EDT	Tornado Warning	PHI	Atlantic, Cape May, Cumberland	25 min
Jul 9, 2:53 AM EDT	Special Marine Warning	PHI		68 min
Jul 9, 3:38 AM EDT	Tornado Warning	PHI	Atlantic, Burlington, Ocean	18 min
Jul 9, 3:51 AM EDT	Special Marine Warning	PHI		84 min
Jul 9, 4:08 AM EDT	Gale Warning	PHI		3 hr
Jul 9, 4:41 AM EDT	Tornado Warning	PHI	Monmouth, Ocean	34 min
Jul 9, 4:44 AM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex	5 hr
Jul 9, 4:54 AM EDT	Areal Flood Advisory	PHI	Morris, Somerset	5 hr
Jul 9, 4:58 AM EDT	Special Marine Warning	PHI		39 min
Jul 9, 5:34 PM EDT	Areal Flood Advisory	PHI	Sussex, Warren	2 hr
Jul 9, 6:24 PM EDT	Special Marine Warning	PHI		66 min
Jul 9, 7:17 PM EDT	Severe Thunderstorm Warning	PHI	Camden, Gloucester	23 min
Jul 9, 7:39 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Sussex, Warren	2 hr
Jul 9, 7:43 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Camden, Cape May, Cumberland, Gloucester, Salem	62 min
Jul 9, 7:46 PM EDT	Areal Flood Advisory	PHI	Atlantic, Camden, Cumberland, Gloucester, Salem	108 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2021 Severe Thunderstorm Warnings in Delaware, 2021 Every severe thunderstorm warning in 2021

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.