Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 278, NWS Philadelphia/Mount Holly

August 27, 2021Camden County, Gloucester County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 27, 2021, 4:06 PM EDT for Camden County, Gloucester County, New Jersey. It was in force for 39 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 27, 2021, 4:06 PM EDT (20:06 UTC)
Expired
Aug 27, 2021, 4:45 PM EDT
In force
39 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Camden County, NJ, Gloucester County, NJ

The radar

The Philadelphia radar (KDIX), 60 km from the middle of the area, began a volume at 20:08 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

TimeReportWhereRemark
Aug 27, 4:55 PM EDTHAIL 0.7Monroe Twp, NJ

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, 8.1 hours before the alert went out and 196 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-pSkew-T log-p diagram, Wallops Is Stn, VA at 12:00Z on 2021-08-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1436 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Wallops Is Stn, VA at 12:00Z on 2021-08-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1436 J/kg
Mixed-layer CIN
-33 J/kg
Mixed-layer LCL
1124 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
52 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

555 
WUUS51 KPHI 272006
SVRPHI
NJC007-015-272045-
/O.NEW.KPHI.SV.W.0278.210827T2006Z-210827T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
406 PM EDT Fri Aug 27 2021

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  South central Camden County in southern New Jersey...
  East central Gloucester County in southern New Jersey...

* Until 445 PM EDT.

* At 406 PM EDT, a severe thunderstorm was located near Monroe
  Township, or 14 miles north of Vineland, and is nearly stationary.

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

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Glassboro, Clayton, Chesilhurst, Victory Lakes, Sicklerville,
  Williamstown and Monroe Township.

This includes Atlantic City Expressway between mile markers 31 and
40.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

In addition to hail and damaging winds, frequent cloud to ground 
lightning is occurring with this storm. Move indoors immediately. 
Remember, if you can hear thunder, you are close enough to be struck 
by lightning.

&&

LAT...LON 3962 7510 3974 7510 3974 7486 3961 7487
TIME...MOT...LOC 2006Z 256DEG 3KT 3967 7492 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gorse
2 follow-up statements
818 
WWUS51 KPHI 272021
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
421 PM EDT Fri Aug 27 2021

NJC007-015-272045-
/O.CON.KPHI.SV.W.0278.000000T0000Z-210827T2045Z/
Camden NJ-Gloucester NJ-
421 PM EDT Fri Aug 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR SOUTH CENTRAL CAMDEN AND EAST CENTRAL GLOUCESTER COUNTIES...

At 420 PM EDT, a severe thunderstorm was located over Victory Lakes,
or 12 miles north of Vineland, moving southeast at 5 mph.

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

SOURCE...Radar indicated.

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

Locations impacted include...
Glassboro, Clayton, Chesilhurst, Victory Lakes, Sicklerville,
Williamstown and Monroe Township.

This includes Atlantic City Expressway between mile markers 31 and
40.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Frequent cloud to ground lightning is occurring with this storm. Move
indoors immediately. Lightning is one of nature's leading killers.
Remember, if you can hear thunder, you are close enough to be struck
by lightning.

&&

LAT...LON 3962 7510 3974 7510 3974 7486 3961 7487
TIME...MOT...LOC 2020Z 301DEG 5KT 3965 7497 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Gorse
325 
WWUS51 KPHI 272039
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
439 PM EDT Fri Aug 27 2021

NJC007-015-272049-
/O.EXP.KPHI.SV.W.0278.000000T0000Z-210827T2045Z/
Camden NJ-Gloucester NJ-
439 PM EDT Fri Aug 27 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL CAMDEN AND EAST
CENTRAL GLOUCESTER COUNTIES WILL EXPIRE AT 445 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 3962 7510 3974 7510 3974 7486 3961 7487
TIME...MOT...LOC 2039Z 256DEG 3KT 3965 7495 

$$

Gorse

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 27, 1:33 PM EDTAreal Flood AdvisoryPHIBurlington, Camden83 min
Aug 27, 2:18 PM EDTSmall Craft AdvisoryPHI44 hr
Aug 27, 2:28 PM EDTSpecial Weather StatementPHIAtlantic47 min
Aug 27, 2:33 PM EDTAreal Flood AdvisoryPHIWarren109 min
Aug 27, 2:37 PM EDTSevere Thunderstorm WarningPHIOcean38 min
Aug 27, 2:38 PM EDTSevere Thunderstorm WarningPHIWarren35 min
Aug 27, 2:59 PM EDTSevere Thunderstorm WarningPHIOcean46 min
Aug 27, 3:07 PM EDTSevere Thunderstorm WarningPHIWarren24 min
Aug 27, 3:16 PM EDTSpecial Weather StatementPHIBurlington44 min
Aug 27, 3:30 PM EDTSevere Thunderstorm WarningPHIBurlington, Ocean45 min
Aug 27, 3:38 PM EDTSpecial Weather StatementPHICamden52 min
Aug 27, 3:45 PM EDTSpecial Weather StatementPHIOcean30 min
Aug 27, 3:54 PM EDTSpecial Weather StatementPHIAtlantic51 min
Aug 27, 3:59 PM EDTSpecial Weather StatementPHIOcean46 min
Aug 27, 4:37 PM EDTAreal Flood AdvisoryPHIGloucester106 min
Aug 27, 4:46 PM EDTSpecial Marine WarningPHI43 min
Aug 27, 4:56 PM EDTSpecial Weather StatementPHIAtlantic34 min
Aug 27, 5:02 PM EDTSevere Thunderstorm WarningPHIAtlantic, Cumberland29 min
Aug 27, 5:09 PM EDTAreal Flood AdvisoryPHIAtlantic, Cape May, Cumberland2 hr
Aug 27, 5:21 PM EDTSpecial Weather StatementPHIMiddlesex39 min
Aug 27, 5:29 PM EDTAreal Flood AdvisoryPHIHunterdon, Mercer, Middlesex, Monmouth, Somerset3 hr
Aug 27, 5:44 PM EDTFlash Flood WarningPHIMiddlesex4 hr
Aug 27, 6:52 PM EDTAreal Flood AdvisoryPHISalem98 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2021Every 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.