Alert archive / New Jersey / Severe Thunderstorm Warnings in 2023
Severe Thunderstorm Warning 294, NWS Philadelphia/Mount Holly
NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 13, 2023, 1:10 AM EDT for 4 counties in Pennsylvania; 6 counties in New Jersey. It was in force for 50 min. 6 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 13, 2023, 1:10 AM EDT (05:10 UTC)
- Expired
- Aug 13, 2023, 2:00 AM EDT
- In force
- 50 min
- Issued by
- NWS Philadelphia/Mount Holly
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Burlington County, NJ, Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Monmouth County, NJ, Somerset County, NJ, Bucks County, PA, Lehigh County, PA, Montgomery County, PA, Northampton County, PA
The radar
The Philadelphia radar (KDIX), 69 km from the middle of the area, began a volume at 05:10 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 13, 1:16 AM EDT | TSTM WND DMG | Milford, NJ | Multiple trees down in Milford. Time estimated from radar. |
| Aug 13, 1:20 AM EDT | TSTM WND DMG | 3 Nw Sand Brook, NJ | Trees down on Route 12 at Whiskey Lane in Franklin Township. Time estimated from radar. |
| Aug 13, 1:28 AM EDT | TSTM WND DMG | 2 Wsw Trenton Mercer Ai, NJ | Delayed report from Sunday 8/13 - Large limb broken off tree along Willis Drive. Time estimated from surface obs. |
| Aug 13, 1:41 AM EDT | TSTM WND DMG | 2 S Raritan, NJ | Trees down on Roycefield Road in Hillsborough Township. Time estimated from radar. |
| Aug 13, 1:45 AM EDT | TSTM WND DMG | Bridgewater, NJ | Trees down. Photos received via social media. Time estimated from radar. |
| Aug 13, 1:54 AM EDT | TSTM WND DMG | Highland Park, NJ | Large tree limbs down which damaged a car. 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 00:00Z, 5.2 hours before the alert went out and 180 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
- 358 J/kg
- Mixed-layer CIN
- -89 J/kg
- Mixed-layer LCL
- 1179 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 102 m²/s²
- 0-3 km storm-relative helicity
- 113 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 2.5
The text
As transmitted.
228
WUUS51 KPHI 130510
SVRPHI
NJC005-019-021-023-025-035-PAC017-077-091-095-130600-
/O.NEW.KPHI.SV.W.0294.230813T0510Z-230813T0600Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
110 AM EDT Sun Aug 13 2023
The National Weather Service in Mount Holly NJ has issued a
* Severe Thunderstorm Warning for...
Hunterdon County in northwestern New Jersey...
Mercer County in central New Jersey...
North central Burlington County in southern New Jersey...
Somerset County in northern New Jersey...
Southwestern Monmouth County in central New Jersey...
Western Middlesex County in northern New Jersey...
East central Lehigh County in eastern Pennsylvania...
East central Montgomery County in southeastern Pennsylvania...
Bucks County in southeastern Pennsylvania...
South central Northampton County in eastern Pennsylvania...
* Until 200 AM EDT.
* At 110 AM EDT, severe thunderstorms were located along a line
extending from near Hellertown to Revere to near Gardenville to
Hatboro, moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
* Locations impacted include...
Trenton, New Brunswick, Somerville, Somerset, Bethlehem, Old
Bridge, East Brunswick, Bridgewater, South Brunswick, North
Brunswick, Manalapan, Ewing, Middlesex, Princeton, Bound Brook,
Manville, Doylestown, Byram, Hatboro and Jamesburg.
This includes the following highways...
New Jersey Turnpike between exits 8 and 10.
Pennsylvania Turnpike between mile markers 341 and 349.
Interstate 78 in Pennsylvania between mile markers 62 and 69.
Interstate 195 in New Jersey between mile markers 0 and 16.
Interstate 295 in New Jersey between mile markers 57 and 76.
Interstate 287 in New Jersey between mile markers 5 and 18.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4017 7441 4012 7448 4015 7521 4038 7516
4049 7520 4051 7540 4060 7546 4061 7520
4059 7518 4061 7516 4063 7483 4059 7443
4043 7436
TIME...MOT...LOC 0510Z 265DEG 33KT 4056 7536 4053 7514 4036 7506 4020
7510
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
RCM4 follow-up statements
592
WWUS51 KPHI 130528
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
128 AM EDT Sun Aug 13 2023
NJC005-025-PAC077-091-095-130538-
/O.CAN.KPHI.SV.W.0294.000000T0000Z-230813T0600Z/
Burlington NJ-Monmouth NJ-Lehigh PA-Montgomery PA-Northampton PA-
128 AM EDT Sun Aug 13 2023
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL BURLINGTON...
SOUTHWESTERN MONMOUTH...EAST CENTRAL LEHIGH...EAST CENTRAL MONTGOMERY
AND SOUTH CENTRAL NORTHAMPTON COUNTIES IS CANCELLED...
The storms which prompted the warning have moved past the warned
area. Therefore, the warning has been cancelled.
LAT...LON 4029 7439 4027 7441 4024 7450 4029 7500
4040 7501 4050 7511 4051 7520 4059 7523
4061 7520 4059 7518 4061 7516 4063 7483
4059 7443 4043 7436
TIME...MOT...LOC 0528Z 265DEG 33KT 4057 7516 4054 7494 4037 7486 4021
7491
$$
NJC019-021-023-035-PAC017-130600-
/O.CON.KPHI.SV.W.0294.000000T0000Z-230813T0600Z/
Hunterdon NJ-Mercer NJ-Somerset NJ-Middlesex NJ-Bucks PA-
128 AM EDT Sun Aug 13 2023
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 AM EDT
FOR HUNTERDON...MERCER...SOMERSET...WESTERN MIDDLESEX AND
NORTHEASTERN BUCKS COUNTIES...
At 128 AM EDT, severe thunderstorms were located along a line
extending from near Riegelsville to near Flemington to near New Hope
to Newtown, moving east at 40 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
New Brunswick, Somerville, Somerset, Old Bridge, East Brunswick,
Bridgewater, South Brunswick, North Brunswick, Ewing, Middlesex,
Princeton, Bound Brook, Manville, Jamesburg, Hightstown, Flemington,
Cranbury, Pennington, New Hope and Hopewell.
This includes the following highways...
New Jersey Turnpike between exits 8A and 10.
Interstate 295 in New Jersey between mile markers 66 and 75.
Interstate 287 in New Jersey between mile markers 5 and 18.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4029 7439 4027 7441 4024 7450 4029 7500
4040 7501 4050 7511 4051 7520 4059 7523
4061 7520 4059 7518 4061 7516 4063 7483
4059 7443 4043 7436
TIME...MOT...LOC 0528Z 265DEG 33KT 4057 7516 4054 7494 4037 7486 4021
7491
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
RCM985
WWUS51 KPHI 130538
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
138 AM EDT Sun Aug 13 2023
PAC017-130547-
/O.CAN.KPHI.SV.W.0294.000000T0000Z-230813T0600Z/
Bucks PA-
138 AM EDT Sun Aug 13 2023
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BUCKS COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 4029 7439 4027 7441 4024 7450 4029 7477
4042 7484 4052 7490 4055 7497 4061 7506
4063 7483 4059 7443 4043 7436
TIME...MOT...LOC 0537Z 258DEG 50KT 4060 7491 4057 7477 4040 7469 4034
7470
$$
NJC019-021-023-035-130600-
/O.CON.KPHI.SV.W.0294.000000T0000Z-230813T0600Z/
Hunterdon NJ-Mercer NJ-Somerset NJ-Middlesex NJ-
138 AM EDT Sun Aug 13 2023
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 AM EDT
FOR SOUTHEASTERN HUNTERDON...NORTHEASTERN MERCER...SOMERSET AND
WESTERN MIDDLESEX COUNTIES...
At 137 AM EDT, severe thunderstorms were located along a line
extending from near Clinton to near White House Station to near
Skillman to near Princeton, moving east at 60 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Damage to roofs, siding, trees, and power lines is
possible.
Locations impacted include...
New Brunswick, Somerville, Somerset, Old Bridge, East Brunswick,
Bridgewater, South Brunswick, North Brunswick, Middlesex, Princeton,
Bound Brook, Manville, Jamesburg, Hightstown, Flemington, Cranbury,
Pennington, Hopewell, Rocky Hill and Millstone.
This includes the following highways...
New Jersey Turnpike between exits 8A and 10.
Interstate 295 in New Jersey between mile markers 67 and 71.
Interstate 287 in New Jersey between mile markers 5 and 18.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4029 7439 4027 7441 4024 7450 4029 7477
4042 7484 4052 7490 4055 7497 4061 7506
4063 7483 4059 7443 4043 7436
TIME...MOT...LOC 0537Z 258DEG 50KT 4060 7491 4057 7477 4040 7469 4034
7470
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
RCM405
WWUS51 KPHI 130542
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
142 AM EDT Sun Aug 13 2023
NJC019-021-023-035-130600-
/O.CON.KPHI.SV.W.0294.000000T0000Z-230813T0600Z/
Hunterdon NJ-Mercer NJ-Somerset NJ-Middlesex NJ-
142 AM EDT Sun Aug 13 2023
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 AM EDT
FOR EAST CENTRAL HUNTERDON...NORTH CENTRAL MERCER...SOMERSET AND
NORTHWESTERN MIDDLESEX COUNTIES...
At 142 AM EDT, severe thunderstorms were located along a line
extending from near Lebanon to near Bridgewater to Rocky Hill to
Princeton, moving east at 40 mph.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
New Brunswick, Somerville, Somerset, East Brunswick, Bridgewater,
South Brunswick, North Brunswick, Middlesex, Princeton, Bound Brook,
Manville, Rocky Hill, Millstone, Skillman, Flagtown, Kingston,
Dayton, Belle Mead, Martinsville and North Brunswick Township.
This includes the following highways...
New Jersey Turnpike near exit 10.
Interstate 287 in New Jersey between mile markers 5 and 18.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4039 7439 4037 7449 4035 7457 4032 7472
4044 7474 4054 7482 4057 7488 4062 7489
4063 7483 4059 7443 4043 7436
TIME...MOT...LOC 0542Z 265DEG 33KT 4060 7485 4057 7471 4040 7463 4034
7464
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
RCM659
WWUS51 KPHI 130550
SVSPHI
Severe Weather Statement
National Weather Service Mount Holly NJ
150 AM EDT Sun Aug 13 2023
NJC021-130600-
/O.CAN.KPHI.SV.W.0294.000000T0000Z-230813T0600Z/
Mercer NJ-
150 AM EDT Sun Aug 13 2023
...THE SEVERE THUNDERSTORM WARNING FOR NORTH CENTRAL MERCER COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 4039 7439 4037 7449 4035 7457 4037 7454
4051 7463 4058 7474 4061 7479 4063 7484
4063 7478 4059 7443 4043 7436
TIME...MOT...LOC 0550Z 265DEG 33KT 4061 7477 4058 7463 4041 7455 4035
7456
$$
NJC019-023-035-130600-
/O.CON.KPHI.SV.W.0294.000000T0000Z-230813T0600Z/
Hunterdon NJ-Somerset NJ-Middlesex NJ-
150 AM EDT Sun Aug 13 2023
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 200 AM EDT
FOR EAST CENTRAL HUNTERDON...CENTRAL SOMERSET AND CENTRAL MIDDLESEX
COUNTIES...
At 150 AM EDT, severe thunderstorms were located along a line
extending from White House Station to Somerville to South Brunswick
to Princeton Meadows, moving east at 40 mph.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
New Brunswick, Somerville, Somerset, East Brunswick, Bridgewater,
South Brunswick, North Brunswick, Middlesex, Bound Brook, Manville,
Millstone, Dayton, Martinsville, North Brunswick Township, Kendall
Park, White House Station, Society Hill, South River, Highland Park
and Spotswood.
This includes the following highways...
New Jersey Turnpike near exit 10.
Interstate 287 in New Jersey between mile markers 5 and 18.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4039 7439 4037 7449 4035 7457 4037 7454
4051 7463 4058 7474 4061 7479 4063 7484
4063 7478 4059 7443 4043 7436
TIME...MOT...LOC 0550Z 265DEG 33KT 4061 7477 4058 7463 4041 7455 4035
7456
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
RCMThe office that day
Everything else NWS Philadelphia/Mount Holly issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 12, 10:01 PM EDT | Special Weather Statement | PHI | Monroe | 44 min |
| Aug 12, 10:28 PM EDT | Special Weather Statement | PHI | Schuylkill | 62 min |
| Aug 12, 11:31 PM EDT | Special Weather Statement | PHI | Berks | 59 min |
| Aug 12, 11:47 PM EDT | Severe Thunderstorm Warning | PHI | Berks | 43 min |
| Aug 13, 12:06 AM EDT | Areal Flood Advisory | PHI | Berks | 3 hr |
| Aug 13, 12:24 AM EDT | Severe Thunderstorm Warning | PHI | Berks, Bucks, Chester, Delaware, Lehigh, Montgomery and 1 more | 51 min |
| Aug 12, 9:22 PM EDT | Special Weather Statement | PHI | Sussex | 53 min |
| Aug 13, 1:25 AM EDT | Tornado Warning | PHI | Hunterdon, Middlesex, Somerset | 35 min |
| Aug 13, 1:41 AM EDT | Severe Thunderstorm Warning | PHI | Hunterdon, Middlesex, Morris, Somerset | 33 min |
| Aug 13, 1:49 AM EDT | Tornado Warning | PHI | Morris, Somerset | 26 min |
Nearby
Severe Thunderstorm Warnings in New Jersey, 2023Severe Thunderstorm Warnings in Pennsylvania, 2023Every severe thunderstorm warning in 2023
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.