Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 229, NWS Philadelphia/Mount Holly

August 12, 2020Monmouth County, Ocean County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 12, 2020, 1:25 PM EDT for Monmouth County, Ocean County, New Jersey. It was in force for 50 min. 4 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
Aug 12, 2020, 1:25 PM EDT (17:25 UTC)
Expired
Aug 12, 2020, 2:15 PM EDT
In force
50 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Monmouth County, NJ, Ocean County, NJ

The radar

The Philadelphia radar (KDIX), 13 km from the middle of the area, began a volume at 17:28 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 12, 1:30 PM EDTTSTM WND DMG2 Wnw Toms River, NJSEVERAL REPORTS OF DOWNED POWER LINES IN THE SILVER RIDGE AREA. TIME ESTIMATED FROM RADAR.
Aug 12, 1:54 PM EDTTSTM WND DMG5 Nw Lakehurst, NJREPORTS OF DOWNED TREE LIMBS AND WIRES NEAR AND SOUTH OF STUMP TAVERN ROAD. TIME ESTIMATED FROM RADAR.
Aug 12, 2:01 PM EDTTSTM WND DMG1 S Buckingham, NJDOWNED TREE AND WIRES NEAR ROOSEVELT CITY ROAD AND GRANT AVENUE IN BUCKINGHAM. TIME ESTIMATED FROM RADAR.
Aug 12, 2:11 PM EDTTSTM WND DMG1 Ene Roosevelt City, NJREPORTS OF POWER LINES DOWN IN THE CRESTWOOD VILLAGE AREA. 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

Brookhaven, NY (KOKX), launched 12:00Z, 5.4 hours before the alert went out and 157 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, Brookhaven, NY at 12:00Z on 2020-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1221 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, Brookhaven, NY at 12:00Z on 2020-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 70 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
1221 J/kg
Mixed-layer CIN
-60 J/kg
Mixed-layer LCL
921 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
70 m²/s²
0-3 km storm-relative helicity
58 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.4

Open this sounding in Storm Lab

The text

As transmitted.

061 
WUUS51 KPHI 121725
SVRPHI
NJC025-029-121815-
/O.NEW.KPHI.SV.W.0229.200812T1725Z-200812T1815Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
125 PM EDT Wed Aug 12 2020

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northern Ocean County in southern New Jersey...
  Southeastern Monmouth County in central New Jersey...

* Until 215 PM EDT.

* At 125 PM EDT, a severe thunderstorm was located over Woodruff, or
  13 miles west of Toms River, moving southeast at 15 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Law enforcement. Trees and wires have been downed in 
           Brick Township.

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

* Locations impacted include...
  Toms River, Lakewood, Jackson, Beachwood, Manasquan, Point Pleasant
  Beach, Seaside Heights, Lakehurst, Mantoloking, Leisure Village,
  Allenwood, Dover Beaches North, Holiday City South, Pleasant
  Plains, Cedar Glen West, Leisure Village East, Dover Beaches South,
  Cassville, Woodruff and Holiday City-Berkeley.

This includes Garden State Parkway between mile markers 74 and 97.
 
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.

In addition to large 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.

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

&&

LAT...LON 3982 7408 3987 7444 3989 7446 4010 7453
      4017 7399
TIME...MOT...LOC 1725Z 320DEG 15KT 4003 7443 

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

CMS
2 follow-up statements
520 
WWUS51 KPHI 121740
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
140 PM EDT Wed Aug 12 2020

NJC025-029-121815-
/O.CON.KPHI.SV.W.0229.000000T0000Z-200812T1815Z/
Ocean NJ-Monmouth NJ-
140 PM EDT Wed Aug 12 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM EDT
FOR NORTHERN OCEAN AND SOUTHEASTERN MONMOUTH COUNTIES...

At 139 PM EDT, a severe thunderstorm was located over Whiting, or 10
miles west of Toms River, moving southeast at 15 mph.

HAZARD...60 mph wind gusts.

SOURCE...Law enforcement. Several reports of trees and wires down 
         have been received near and southwest of Brick Township 
         toward the Lakehurst area.

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

Locations impacted include...
Toms River, Lakewood, Jackson, Beachwood, Manasquan, Point Pleasant
Beach, Seaside Heights, Lakehurst, Mantoloking, Leisure Village,
Allenwood, Dover Beaches North, Holiday City South, Pleasant Plains,
Cedar Glen West, Leisure Village East, Dover Beaches South,
Cassville, Woodruff and Holiday City-Berkeley.

This includes Garden State Parkway between mile markers 74 and 97.
 
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.

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.

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

&&

LAT...LON 3983 7408 3982 7409 3987 7444 3990 7446
      4010 7453 4017 7399
TIME...MOT...LOC 1739Z 320DEG 15KT 3998 7438 

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

CMS
096 
WWUS51 KPHI 121813
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
213 PM EDT Wed Aug 12 2020

NJC025-029-121823-
/O.EXP.KPHI.SV.W.0229.000000T0000Z-200812T1815Z/
Ocean NJ-Monmouth NJ-
213 PM EDT Wed Aug 12 2020

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN OCEAN AND
SOUTHEASTERN MONMOUTH COUNTIES WILL EXPIRE AT 215 PM EDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However, gusty 
winds and heavy rain are still possible with this thunderstorm.

LAT...LON 3983 7408 3982 7409 3987 7444 3990 7446
      4010 7453 4017 7399
TIME...MOT...LOC 1813Z 320DEG 15KT 3988 7427 

$$

CMS

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 12, 12:06 PM EDTSpecial Weather StatementPHIMonmouth24 min
Aug 12, 12:16 PM EDTSpecial Weather StatementPHIBurlington29 min
Aug 12, 12:33 PM EDTSevere Thunderstorm WarningPHIBurlington42 min
Aug 12, 12:43 PM EDTAreal Flood AdvisoryPHIBurlington, Camden, Gloucester, Mercer, Monmouth, Ocean and 1 more3 hr
Aug 12, 12:45 PM EDTSevere Thunderstorm WarningPHIMonmouth, Ocean45 min
Aug 12, 1:12 PM EDTFlash Flood WarningPHIBurlington3 hr
Aug 12, 1:12 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester, Monmouth, Ocean48 min
Aug 12, 1:54 PM EDTSevere Thunderstorm WarningPHIBurlington, Camden, Gloucester51 min
Aug 12, 1:57 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Ocean48 min
Aug 12, 2:40 PM EDTFlash Flood WarningPHIBurlington, Camden, Gloucester3 hr
Aug 12, 2:42 PM EDTSevere Thunderstorm WarningPHIBurlington, Ocean25 min
Aug 12, 2:44 PM EDTSevere Thunderstorm WarningPHICamden, Gloucester46 min
Aug 12, 3:12 PM EDTSevere Thunderstorm WarningPHIAtlantic, Burlington, Camden, Gloucester, Salem29 min
Aug 12, 3:54 PM EDTSpecial Marine WarningPHI53 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2020Every 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.