Alert archive / New Jersey / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 231, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 12, 2020, 1:57 PM EDT for Atlantic County, Burlington County, Ocean County, New Jersey. It was in force for 48 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 12, 2020, 1:57 PM EDT (17:57 UTC)
- Expired
- Aug 12, 2020, 2:45 PM EDT
- In force
- 48 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Atlantic County, NJ, Burlington County, NJ, Ocean County, NJ
The radar
The Philadelphia radar (KDIX), 29 km from the middle of the area, began a volume at 17:56 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 12, 2:16 PM EDT | TSTM WND DMG | 2 Sse Chatsworth, NJ | DOWNED TREE LIMBS AND WIRES NEAR CHATSWORTH TUCKERTON ROAD. 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, 6.0 hours before the alert went out and 192 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.
- 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
The text
As transmitted.
201
WUUS51 KPHI 121757
SVRPHI
NJC001-005-029-121845-
/O.NEW.KPHI.SV.W.0231.200812T1757Z-200812T1845Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
157 PM EDT Wed Aug 12 2020
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
North central Atlantic County in southern New Jersey...
Central Ocean County in southern New Jersey...
Southeastern Burlington County in southern New Jersey...
* Until 245 PM EDT.
* At 157 PM EDT, a severe thunderstorm was located over Batsto, or 20
miles northwest of Atlantic City, moving northeast at 15 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...
Hammonton, Egg Harbor City, Brookville, Warren Grove, Batsto,
Wharton State Forest, Chatsworth, Old Halfway, Penn State Forest,
Wading River and Ocean Acres.
This includes Garden State Parkway between mile markers 71 and 74.
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 3954 7458 3966 7475 3991 7456 3984 7417
TIME...MOT...LOC 1757Z 222DEG 11KT 3966 7460
HAIL...1.00IN
WIND...60MPH
$$
CMS1 follow-up statement
797
WWUS51 KPHI 121824
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
224 PM EDT Wed Aug 12 2020
NJC001-121834-
/O.CAN.KPHI.SV.W.0231.000000T0000Z-200812T1845Z/
Atlantic NJ-
224 PM EDT Wed Aug 12 2020
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL ATLANTIC COUNTY
IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 3965 7443 3973 7470 3991 7456 3984 7417
TIME...MOT...LOC 1824Z 222DEG 11KT 3972 7453
$$
NJC005-029-121845-
/O.CON.KPHI.SV.W.0231.000000T0000Z-200812T1845Z/
Ocean NJ-Burlington NJ-
224 PM EDT Wed Aug 12 2020
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM EDT
FOR CENTRAL OCEAN AND SOUTHEASTERN BURLINGTON COUNTIES...
At 224 PM EDT, a severe thunderstorm was located near Penn State
Forest, or 23 miles north of Atlantic City, moving northeast at 15
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...
Brookville, Warren Grove, Wharton State Forest, Chatsworth, Old
Halfway, Penn State Forest and Ocean Acres.
This includes Garden State Parkway between mile markers 71 and 74.
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 3965 7443 3973 7470 3991 7456 3984 7417
TIME...MOT...LOC 1824Z 222DEG 11KT 3972 7453
HAIL...1.00IN
WIND...60MPH
$$
CMSThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 12:06 PM EDT | Special Weather Statement | PHI | Monmouth | 24 min |
| Aug 12, 12:16 PM EDT | Special Weather Statement | PHI | Burlington | 29 min |
| Aug 12, 12:33 PM EDT | Severe Thunderstorm Warning | PHI | Burlington | 42 min |
| Aug 12, 12:43 PM EDT | Areal Flood Advisory | PHI | Burlington, Camden, Gloucester, Mercer, Monmouth, Ocean and 1 more | 3 hr |
| Aug 12, 12:45 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 45 min |
| Aug 12, 1:12 PM EDT | Flash Flood Warning | PHI | Burlington | 3 hr |
| Aug 12, 1:12 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester, Monmouth, Ocean | 48 min |
| Aug 12, 1:25 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 50 min |
| Aug 12, 1:54 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester | 51 min |
| Aug 12, 2:40 PM EDT | Flash Flood Warning | PHI | Burlington, Camden, Gloucester | 3 hr |
| Aug 12, 2:42 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Ocean | 25 min |
| Aug 12, 2:44 PM EDT | Severe Thunderstorm Warning | PHI | Camden, Gloucester | 46 min |
| Aug 12, 3:12 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Gloucester, Salem | 29 min |
| Aug 12, 3:54 PM EDT | Special Marine Warning | PHI | 53 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.