Alert archive / New Jersey / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 16, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 21, 2021, 2:17 PM EDT for 4 counties in New Jersey. It was in force for 43 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
- Apr 21, 2021, 2:17 PM EDT (18:17 UTC)
- Expired
- Apr 21, 2021, 3:00 PM EDT
- In force
- 43 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Atlantic County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ
The radar
The Dover AFB radar (KDOX), 71 km from the middle of the area, began a volume at 18:17 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 |
|---|---|---|---|
| Apr 21, 2:20 PM EDT | TSTM WND GST 54 | 1 W Millville Municipal, NJ | ASOS STATION KMIV MILLVILLE. |
| Apr 21, 2:23 PM EDT | HAIL 1 | Millville, NJ | |
| Apr 21, 2:24 PM EDT | HAIL 0.88 | 1 Wsw Millville, NJ | SOCIAL MEDIA. TIME ESTIMATED FROM RADAR. |
| Apr 21, 2:40 PM EDT | HAIL 0.25 | Dorothy, NJ |
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 |
|---|---|---|---|
| Apr 21, 12:28 PM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Wallops Is Stn, VA (KWAL), launched 12:00Z, 6.3 hours before the alert went out and 165 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
- 12 J/kg
- Mixed-layer CIN
- -142 J/kg
- Mixed-layer LCL
- 1437 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 136 m²/s²
- 0-3 km storm-relative helicity
- 126 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
239
WUUS51 KPHI 211817
SVRPHI
NJC001-011-015-033-211900-
/O.NEW.KPHI.SV.W.0016.210421T1817Z-210421T1900Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
217 PM EDT Wed Apr 21 2021
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Southwestern Atlantic County in southern New Jersey...
Central Cumberland County in southern New Jersey...
Southeastern Salem County in southern New Jersey...
Southeastern Gloucester County in southern New Jersey...
* Until 300 PM EDT.
* At 216 PM EDT, a severe thunderstorm was located over Fairton, or
near Bridgeton, moving northeast 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, Cumberland, Hammonton, Buena,
Laurel Lake, Weymouth, Estell Manor, Newfield, Newport, Mays
Landing, Dorothy, Fairton, Cedarville, Mizpah, South Vineland,
Rosenhayn, Folsom and Collings Lakes.
This includes Atlantic City Expressway between mile markers 13 and
23.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3928 7522 3943 7531 3961 7483 3947 7459
3933 7501 3932 7511
TIME...MOT...LOC 1816Z 244DEG 36KT 3938 7517
HAIL...1.00IN
WIND...60MPH
$$
JEO3 follow-up statements
498
WWUS51 KPHI 211828
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
228 PM EDT Wed Apr 21 2021
NJC001-011-015-033-211900-
/O.CON.KPHI.SV.W.0016.000000T0000Z-210421T1900Z/
Atlantic NJ-Cumberland NJ-Salem NJ-Gloucester NJ-
228 PM EDT Wed Apr 21 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM EDT
FOR SOUTHWESTERN ATLANTIC...NORTHEASTERN CUMBERLAND...SOUTHEASTERN
SALEM AND SOUTHEASTERN GLOUCESTER COUNTIES...
At 227 PM EDT, a severe thunderstorm was located over South Vineland,
or over Vineland, moving northeast at 40 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Vineland, Millville, Cumberland, Hammonton, Buena, Laurel Lake,
Weymouth, Estell Manor, Newfield, Mays Landing, Dorothy, Mizpah,
South Vineland, Rosenhayn, Folsom and Collings Lakes.
This includes Atlantic City Expressway between mile markers 13 and
23.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3947 7459 3933 7501 3933 7504 3948 7518
3961 7483
TIME...MOT...LOC 1827Z 244DEG 36KT 3943 7503
HAIL...1.25IN
WIND...60MPH
$$
JEO355
WWUS51 KPHI 211840
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
240 PM EDT Wed Apr 21 2021
NJC033-211850-
/O.CAN.KPHI.SV.W.0016.000000T0000Z-210421T1900Z/
Salem NJ-
240 PM EDT Wed Apr 21 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SALEM 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 600 PM EDT for
southern New Jersey.
LAT...LON 3947 7459 3938 7485 3954 7502 3961 7483
TIME...MOT...LOC 1840Z 244DEG 36KT 3949 7488
$$
NJC001-011-015-211900-
/O.CON.KPHI.SV.W.0016.000000T0000Z-210421T1900Z/
Atlantic NJ-Cumberland NJ-Gloucester NJ-
240 PM EDT Wed Apr 21 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM EDT
FOR SOUTHWESTERN ATLANTIC...NORTHEASTERN CUMBERLAND AND SOUTHEASTERN
GLOUCESTER COUNTIES...
At 240 PM EDT, a severe thunderstorm was located over Mizpah, or near
Vineland, moving northeast at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Public. Quarter size hail was reported in Millville.
IMPACT...Minor damage to vehicles is possible. Wind damage to roofs,
siding, trees, and power lines is possible.
Locations impacted include...
Vineland, Hammonton, Buena, Weymouth, Estell Manor, Newfield,
Dorothy, Mays Landing, Mizpah, Folsom and Collings Lakes.
This includes Atlantic City Expressway between mile markers 13 and
23.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Protecting yourself from immediate threats to life and safety shall
take priority. Whenever possible, as long as it does not cause
greater harm, all COVID-19 protective action guidance should be
followed.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3947 7459 3938 7485 3954 7502 3961 7483
TIME...MOT...LOC 1840Z 244DEG 36KT 3949 7488
HAIL...1.00IN
WIND...60MPH
$$
JEO176
WWUS51 KPHI 211853
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
253 PM EDT Wed Apr 21 2021
NJC001-011-015-211902-
/O.EXP.KPHI.SV.W.0016.000000T0000Z-210421T1900Z/
Atlantic NJ-Cumberland NJ-Gloucester NJ-
253 PM EDT Wed Apr 21 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN ATLANTIC...
NORTHEASTERN CUMBERLAND AND SOUTHEASTERN GLOUCESTER COUNTIES WILL
EXPIRE AT 300 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 600 PM EDT for
southern New Jersey.
LAT...LON 3947 7459 3938 7485 3954 7502 3961 7483
TIME...MOT...LOC 1852Z 244DEG 36KT 3954 7476
$$
JEOThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 8:48 PM EDT | Freeze Watch | PHI | Hunterdon, Morris, Somerset, Sussex, Warren | 7 hr |
| Apr 21, 3:26 AM EDT | Freeze Warning | PHI | Hunterdon, Morris, Somerset, Sussex, Warren | 30 hr |
| Apr 21, 12:25 PM EDT | Severe Thunderstorm Warning | PHI | Warren | 50 min |
| Apr 21, 12:51 PM EDT | Severe Thunderstorm Warning | PHI | Sussex, Warren | 21 min |
| Apr 21, 12:55 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Warren | 27 min |
| Apr 21, 1:10 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Gloucester, Mercer, Salem | 50 min |
| Apr 21, 1:17 PM EDT | Special Weather Statement | PHI | Hunterdon, Morris, Somerset, Sussex | 58 min |
| Apr 21, 1:28 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Camden, Gloucester | 36 min |
| Apr 21, 1:30 PM EDT | Special Marine Warning | PHI | 60 min | |
| Apr 21, 1:43 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Middlesex, Morris, Somerset | 33 min |
| Apr 21, 1:58 PM EDT | Special Weather Statement | PHI | Burlington, Camden, Monmouth, Ocean | 62 min |
| Apr 21, 2:02 PM EDT | Severe Thunderstorm Warning | PHI | Burlington, Camden, Monmouth, Ocean | 43 min |
| Apr 21, 2:03 PM EDT | Special Weather Statement | PHI | Cumberland | 27 min |
| Apr 21, 2:28 PM EDT | Special Weather Statement | PHI | Middlesex, Monmouth | 47 min |
| Apr 21, 2:30 PM EDT | Special Marine Warning | PHI | 60 min | |
| Apr 21, 2:38 PM EDT | Severe Thunderstorm Warning | PHI | Monmouth, Ocean | 37 min |
| Apr 21, 2:40 PM EDT | Special Marine Warning | PHI | 55 min | |
| Apr 21, 2:43 PM EDT | Special Weather Statement | PHI | Cape May | 32 min |
| Apr 21, 2:50 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic, Burlington, Ocean | 40 min |
| Apr 21, 3:02 PM EDT | Severe Thunderstorm Warning | PHI | Atlantic | 28 min |
| Apr 21, 3:07 PM EDT | Special Marine Warning | PHI | 53 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.