Alert archive / New Jersey / Severe Thunderstorm Warnings in 2024
Severe Thunderstorm Warning 211, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 18, 2024, 5:47 PM EDT for Bucks County, Pennsylvania; 4 counties in New Jersey. It was in force for 58 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 18, 2024, 5:47 PM EDT (21:47 UTC)
- Expired
- Aug 18, 2024, 6:45 PM EDT
- In force
- 58 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Burlington County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Bucks County, PA
The radar
The Philadelphia radar (KDIX), 39 km from the middle of the area, began a volume at 21:48 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.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 18, 2:02 PM EDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Brookhaven, NY (KOKX), launched 12:00Z, 9.8 hours before the alert went out and 170 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
- 109 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 582 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 187 m²/s²
- 0-3 km storm-relative helicity
- 205 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
376
WUUS51 KPHI 182147 RRA
SVRPHI
NJC005-021-023-025-PAC017-182245-
/O.NEW.KPHI.SV.W.0211.240818T2147Z-240818T2245Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
547 PM EDT Sun Aug 18 2024
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Mercer County in central New Jersey...
North central Burlington County in southern New Jersey...
Southwestern Monmouth County in central New Jersey...
Southwestern Middlesex County in northern New Jersey...
Southeastern Bucks County in southeastern Pennsylvania...
* Until 645 PM EDT.
* At 547 PM EDT, a severe thunderstorm was located over Jacksonville,
or 12 miles south of Trenton, moving northeast at 25 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...
Trenton, Manalapan, Ewing, Lumberton, Princeton, Florence,
Burlington, Bristol, Mount Holly, Hightstown, Bordentown, Cranbury,
Tullytown, Allentown, Pemberton, Roosevelt, Wrightstown, Princeton
Meadows, Windsor, and Florence-Roebling.
This includes the following highways...
New Jersey Turnpike between exits 5 and 8A.
Pennsylvania Turnpike near mile marker 359.
Interstate 195 in New Jersey between mile markers 0 and 15.
Interstate 295 in New Jersey between mile markers 44 and 72.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
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 3993 7475 4000 7489 4040 7474 4039 7473
4037 7472 4038 7469 4039 7465 4026 7432
TIME...MOT...LOC 2147Z 210DEG 22KT 4005 7480
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Staarmann3 follow-up statements
086
WWUS51 KPHI 182158
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
558 PM EDT Sun Aug 18 2024
NJC005-021-023-025-PAC017-182245-
/O.CON.KPHI.SV.W.0211.000000T0000Z-240818T2245Z/
Mercer NJ-Burlington NJ-Monmouth NJ-Middlesex NJ-Bucks PA-
558 PM EDT Sun Aug 18 2024
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR MERCER...NORTH CENTRAL BURLINGTON...SOUTHWESTERN MONMOUTH...
SOUTHWESTERN MIDDLESEX AND EASTERN BUCKS COUNTIES...
At 558 PM EDT, a severe thunderstorm was located over Columbus, or 8
miles southeast of Trenton, moving northeast at 25 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...
Trenton, Manalapan, Ewing, Princeton, Florence, Burlington,
Hightstown, Bordentown, Cranbury, Tullytown, Allentown, Roosevelt,
Wrightstown, Princeton Meadows, Windsor, Florence-Roebling, Kingston,
Plainsboro Center, Jacksonville, and Georgetown.
This includes the following highways...
New Jersey Turnpike between exits 6 and 8A.
Interstate 195 in New Jersey between mile markers 0 and 15.
Interstate 295 in New Jersey between mile markers 49 and 71.
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.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4000 7466 4006 7484 4040 7474 4039 7473
4037 7472 4038 7469 4039 7465 4026 7432
TIME...MOT...LOC 2158Z 212DEG 22KT 4010 7470
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Staarmann921
WWUS51 KPHI 182221
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
621 PM EDT Sun Aug 18 2024
PAC017-182231-
/O.CAN.KPHI.SV.W.0211.000000T0000Z-240818T2245Z/
Bucks PA-
621 PM EDT Sun Aug 18 2024
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN BUCKS 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 1000 PM EDT for
southern, central and northern New Jersey...and southeastern
Pennsylvania.
LAT...LON 4010 7464 4014 7473 4016 7472 4018 7475
4034 7476 4040 7474 4037 7472 4039 7465
4027 7435
TIME...MOT...LOC 2221Z 208DEG 21KT 4021 7464
$$
NJC005-021-023-025-182245-
/O.CON.KPHI.SV.W.0211.000000T0000Z-240818T2245Z/
Mercer NJ-Burlington NJ-Monmouth NJ-Middlesex NJ-
621 PM EDT Sun Aug 18 2024
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM EDT
FOR MERCER...NORTHERN BURLINGTON...WEST CENTRAL MONMOUTH AND
SOUTHWESTERN MIDDLESEX COUNTIES...
At 621 PM EDT, a severe thunderstorm was located over
Mercerville-Hamilton Square, or near Trenton, moving northeast at 25
mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
Trenton, Manalapan, Ewing, Princeton, Hightstown, Bordentown,
Cranbury, Allentown, Roosevelt, Princeton Meadows, Windsor,
Plainsboro Center, Clearbrook Park, Edinburg, Crosswicks, White
Horse, Twin Rivers, Mercerville-Hamilton Square, Lawrenceville, and
Kingston.
This includes the following highways...
New Jersey Turnpike between exits 8 and 8A.
Interstate 195 in New Jersey between mile markers 0 and 11.
Interstate 295 in New Jersey between mile markers 57 and 70.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 4010 7464 4014 7473 4016 7472 4018 7475
4034 7476 4040 7474 4037 7472 4039 7465
4027 7435
TIME...MOT...LOC 2221Z 208DEG 21KT 4021 7464
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Staarmann857
WWUS51 KPHI 182237
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
637 PM EDT Sun Aug 18 2024
NJC005-021-023-025-182247-
/O.EXP.KPHI.SV.W.0211.000000T0000Z-240818T2245Z/
Mercer NJ-Burlington NJ-Monmouth NJ-Middlesex NJ-
637 PM EDT Sun Aug 18 2024
...THE SEVERE THUNDERSTORM WARNING FOR MERCER...NORTHERN
BURLINGTON...WEST CENTRAL MONMOUTH AND SOUTHWESTERN MIDDLESEX
COUNTIES WILL EXPIRE AT 645 PM EDT...
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.
A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
southern, central and northern New Jersey...and southeastern
Pennsylvania.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Mount Holly NJ.
LAT...LON 4010 7464 4014 7473 4016 7472 4018 7475
4034 7476 4040 7474 4037 7472 4039 7465
4027 7435
TIME...MOT...LOC 2237Z 210DEG 22KT 4028 7459
$$
StaarmannThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 1:35 AM EDT | Flash Flood Warning | PHI | Bucks, Delaware, Montgomery, Philadelphia | 2 hr |
| Aug 18, 3:09 AM EDT | Flash Flood Warning | PHI | Bucks | 93 min |
| Aug 18, 3:24 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 19 min |
| Aug 18, 3:34 PM EDT | Severe Thunderstorm Warning | PHI | Chester, Delaware, Montgomery, Philadelphia | 41 min |
| Aug 18, 3:48 PM EDT | Severe Thunderstorm Warning | PHI | Carbon, Monroe | 42 min |
| Aug 18, 4:04 PM EDT | Severe Thunderstorm Warning | PHI | Monroe | 41 min |
| Aug 18, 4:25 PM EDT | Severe Thunderstorm Warning | PHI | Bucks, Lehigh, Montgomery, Northampton | 28 min |
| Aug 18, 4:41 PM EDT | Severe Thunderstorm Warning | PHI | Monroe, Northampton | 34 min |
| Aug 18, 4:56 PM EDT | Flash Flood Warning | PHI | Monroe, Northampton | 6 hr |
| Aug 18, 5:21 PM EDT | Severe Thunderstorm Warning | PHI | Bucks | 39 min |
| Aug 18, 5:31 PM EDT | Flash Flood Warning | PHI | Bucks, Lehigh, Northampton | 6 hr |
| Aug 18, 4:41 AM EDT | Flash Flood Warning | PHI | Burlington, Camden, Mercer | 2 hr |
| Aug 18, 2:17 PM EDT | Special Marine Warning | PHI | 58 min | |
| Aug 18, 2:42 PM EDT | Special Marine Warning | PHI | 93 min | |
| Aug 18, 3:55 PM EDT | Special Marine Warning | PHI | 95 min | |
| Aug 18, 5:10 PM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Morris, Warren | 29 min |
| Aug 18, 5:38 PM EDT | Flash Flood Warning | PHI | Sussex, Warren | 4 hr |
| Aug 18, 5:47 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Sussex | 43 min |
| Aug 18, 5:51 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Somerset | 24 min |
| Aug 18, 5:59 PM EDT | Severe Thunderstorm Warning | PHI | Morris, Sussex | 18 min |
| Aug 18, 6:01 PM EDT | Flash Flood Warning | PHI | Hunterdon, Morris, Somerset, Sussex, Warren | 6 hr |
| Aug 18, 6:24 PM EDT | Severe Thunderstorm Warning | PHI | Middlesex, Morris, Somerset | 66 min |
| Aug 18, 6:36 PM EDT | Flash Flood Warning | PHI | Morris, Somerset | 5 hr |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2024Severe Thunderstorm Warnings in Pennsylvania, 2024Every severe thunderstorm warning in 2024
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.