Alert archive / New Jersey / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 1, NWS Philadelphia/Mount Holly

February 21, 20234 counties in New Jersey; Bucks County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Feb 21, 2023, 3:15 PM EST for 4 counties in New Jersey; Bucks County, Pennsylvania. It was in force for 45 min. 21 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
Feb 21, 2023, 3:15 PM EST (20:15 UTC)
Expired
Feb 21, 2023, 4:00 PM EST
In force
45 min
Issued by
NWS Philadelphia/Mount Holly
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Hunterdon County, NJ, Mercer County, NJ, Middlesex County, NJ, Somerset County, NJ, Bucks County, PA

The radar

The Philadelphia radar (KDIX), 38 km from the middle of the area, began a volume at 20:18 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
Feb 21, 3:25 PM ESTHAIL 0.75Trenton Mercer Airport, NJ
Feb 21, 3:30 PM ESTHAIL 1Lawrenceville, NJ
Feb 21, 3:30 PM ESTHAIL 1Lawrenceville, NJ
Feb 21, 3:30 PM ESTHAIL 1Pennington, NJ
Feb 21, 3:35 PM ESTHAIL 0.51 W Prospect Park, NJREPORT FROM MPING: HALF-INCH (0.50 IN.).
Feb 21, 3:35 PM ESTTORNADO2 Ese Lawrence Twp, NJSPORADIC MINOR TREE DAMAGE WAS OBSERVED WEST OF INTERSTATE 295. A CONTINUOUS PATH OF TREE DAMAGE WAS OBSERVED NEAR LAWRENCE STATION ROAD, PARTICULARLY IN A HOUSING DEVELOPMENT ALONG FOUNTAYNE LANE. ADDITIONAL TREE DAMAGE AND DAMAGE TO ROOFING OCCURRED IN A HOU
Feb 21, 3:37 PM ESTHAIL 0.751 W Woodsville, NJREPORT FROM MPING: DIME (0.75 IN.).
Feb 21, 3:39 PM ESTTSTM WND DMG1 N Edinburg, NJBROADCAST MEDIA REPORTS LARGE TREES DOWN ON DUNBAR DRIVE AND CONOVER ROAD IN WEST WINDSOR, NJ. POSSIBLE TORNADO.
Feb 21, 3:40 PM ESTTSTM WND DMG1 Ese Lawrence Twp, NJROUTE 1 CLOSED AT INTERSECTION OF FRANKLIN CORNER ROAD DUE TO POWER LINES DOWN.
Feb 21, 3:40 PM ESTTSTM WND DMGPennington, NJNWS EMPLOYEE REPORTS DAMAGE ON QUAKERBRIDGE ROAD. POSSIBLE TORNADO.
Feb 21, 3:40 PM ESTHAIL 0.51 Ne Hamilton Square, NJ
Feb 21, 3:40 PM ESTHAIL 0.52 E Woodsville, NJREPORT FROM MPING: HALF-INCH (0.50 IN.).
Feb 21, 3:40 PM ESTHAIL 0.75Hamilton Square, NJ
Feb 21, 3:43 PM ESTHAIL 0.51 Ne Mercerville, NJREPORT FROM MPING: HALF-INCH (0.50 IN.).
Feb 21, 3:44 PM ESTHAIL 0.51 W West Windsor Twp., NJREPORT FROM MPING: HALF-INCH (0.50 IN.).
Feb 21, 3:45 PM ESTTSTM WND DMG2 Nne Windsor, NJTREE DAMAGE REPORTED IN RESIDENTIAL AREAS OF EAST WINDSOR TWP NEAR WAYNE WAY & DORCHESTER DRIVE; CHESTNUT DRIVE & GLEN OAK; AND ELM DRIVE & PRIMROSE LANE. THIS AREA WAS DOWNSTREAM AND TO THE RIGHT OF A TORNADO AND WAS LIKELY CAUSED BY STRONG RFD WINDS. TIME ES
Feb 21, 3:45 PM ESTHAIL 0.51 N Hamilton Square, NJREPORT FROM MPING: HALF-INCH (0.50 IN.).
Feb 21, 3:46 PM ESTHAIL 0.52 E Windsor, NJREPORT FROM MPING: HALF-INCH (0.50 IN.).
Feb 21, 3:47 PM ESTHAIL 11 Wsw Woodsville, NJREPORT FROM MPING: QUARTER (1.00 IN.).
Feb 21, 3:50 PM ESTTSTM WND DMGPennington, NJPOSSIBLE TORNADO IN QUAKER BRIDGE. REPORT OF TREES AND WIRES ON A CAR.
Feb 21, 4:01 PM ESTHAIL 0.51 E Twin Rivers, NJREPORT FROM MPING: HALF-INCH (0.50 IN.).

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, 8.3 hours before the alert went out and 161 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 2023-02-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brookhaven, NY at 12:00Z on 2023-02-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 square meters per square second.1939587897117136Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
565 m above ground
0-6 km bulk shear
67 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
148 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

583 
WUUS51 KPHI 212015
SVRPHI
NJC019-021-023-035-PAC017-212100-
/O.NEW.KPHI.SV.W.0001.230221T2015Z-230221T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
315 PM EST Tue Feb 21 2023

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Southeastern Hunterdon County in northwestern New Jersey...
  Mercer County in central New Jersey...
  Southwestern Somerset County in northern New Jersey...
  Southwestern Middlesex County in northern New Jersey...
  East central Bucks County in southeastern Pennsylvania...

* Until 400 PM EST.

* At 315 PM EST, a severe thunderstorm was located over New Hope, or
  13 miles northwest of Trenton, moving east at 45 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, Ewing, Princeton, Jamesburg, Hightstown, Cranbury,
  Pennington, New Hope, Yardley, Hopewell, Allentown, Rocky Hill,
  Stockton, Washington Crossing, Skillman, Princeton Meadows,
  Windsor, Kingston, Dayton and Plainsboro Center.

This includes the following highways...
 New Jersey Turnpike between exits 8 and 9.
 Interstate 195 in New Jersey between mile markers 2 and 8.
 Interstate 295 in New Jersey between mile markers 62 and 76.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4026 7444 4025 7448 4023 7450 4022 7453
      4018 7457 4018 7461 4016 7460 4032 7507
      4047 7496 4035 7435
TIME...MOT...LOC 2015Z 290DEG 38KT 4038 7493 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

PO
2 follow-up statements
433 
WWUS51 KPHI 212031
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
331 PM EST Tue Feb 21 2023

NJC019-PAC017-212040-
/O.CAN.KPHI.SV.W.0001.000000T0000Z-230221T2100Z/
Hunterdon NJ-Bucks PA-
331 PM EST Tue Feb 21 2023

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HUNTERDON AND
EAST CENTRAL BUCKS COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4026 7444 4025 7448 4023 7450 4022 7454
      4019 7456 4018 7461 4016 7460 4024 7482
      4029 7487 4042 7478 4043 7475 4035 7435
TIME...MOT...LOC 2030Z 290DEG 38KT 4032 7473 

$$

NJC021-023-035-212100-
/O.CON.KPHI.SV.W.0001.000000T0000Z-230221T2100Z/
Mercer NJ-Somerset NJ-Middlesex NJ-
331 PM EST Tue Feb 21 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EST
FOR MERCER...SOUTHWESTERN SOMERSET AND SOUTHWESTERN MIDDLESEX
COUNTIES...

At 330 PM EST, a severe thunderstorm was located over Lawrenceville,
or 7 miles north of Trenton, moving east at 45 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, Ewing, Princeton, Jamesburg, Hightstown, Cranbury,
Pennington, Hopewell, Rocky Hill, Skillman, Princeton Meadows,
Windsor, Kingston, Dayton, Plainsboro Center, Clearbrook Park,
Edinburg, Twin Rivers, Whittingham and Mercerville-Hamilton Square.

This includes the following highways...
 New Jersey Turnpike between exits 8 and 9.
 Interstate 195 in New Jersey between mile markers 3 and 8.
 Interstate 295 in New Jersey between mile markers 62 and 76.

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.

&&

LAT...LON 4026 7444 4025 7448 4023 7450 4022 7454
      4019 7456 4018 7461 4016 7460 4024 7482
      4029 7487 4042 7478 4043 7475 4035 7435
TIME...MOT...LOC 2030Z 290DEG 38KT 4032 7473 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

PO
464 
WWUS51 KPHI 212045
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
345 PM EST Tue Feb 21 2023

NJC035-212055-
/O.CAN.KPHI.SV.W.0001.000000T0000Z-230221T2100Z/
Somerset NJ-
345 PM EST Tue Feb 21 2023

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN SOMERSET COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning has been cancelled.

LAT...LON 4026 7444 4025 7448 4023 7450 4022 7454
      4019 7456 4018 7461 4016 7460 4020 7470
      4025 7471 4033 7466 4037 7460 4035 7435
TIME...MOT...LOC 2045Z 290DEG 38KT 4026 7453 

$$

NJC021-023-212100-
/O.CON.KPHI.SV.W.0001.000000T0000Z-230221T2100Z/
Mercer NJ-Middlesex NJ-
345 PM EST Tue Feb 21 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM EST
FOR SOUTHEASTERN MERCER AND SOUTHWESTERN MIDDLESEX COUNTIES...

At 345 PM EST, a severe thunderstorm was located over Hightstown, or
12 miles east of Trenton, moving east at 45 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...
Jamesburg, Hightstown, Cranbury, Edinburg, Princeton Meadows,
Windsor, Twin Rivers, Whittingham, Mercerville-Hamilton Square,
Plainsboro Center, Clearbrook Park, White Horse, Concordia, Princeton
Junction, Rossmoor and Yardville-Groveville.

This includes the following highways...
 New Jersey Turnpike between exits 8 and 9.
 Interstate 195 in New Jersey between mile markers 3 and 8.
 Interstate 295 in New Jersey between mile markers 63 and 67.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4026 7444 4025 7448 4023 7450 4022 7454
      4019 7456 4018 7461 4016 7460 4020 7470
      4025 7471 4033 7466 4037 7460 4035 7435
TIME...MOT...LOC 2045Z 290DEG 38KT 4026 7453 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

PO

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 21, 1:59 PM ESTSpecial Weather StatementPHISalem31 min
Feb 21, 2:02 PM ESTSpecial Marine WarningPHI58 min
Feb 21, 2:21 PM ESTSpecial Weather StatementPHICumberland39 min
Feb 21, 2:30 PM ESTSpecial Weather StatementPHIAtlantic, Cumberland45 min
Feb 21, 2:39 PM ESTSpecial Marine WarningPHI66 min
Feb 21, 2:47 PM ESTSpecial Weather StatementPHIHunterdon43 min
Feb 21, 2:48 PM ESTSpecial Weather StatementPHIBurlington, Ocean27 min
Feb 21, 2:56 PM ESTSpecial Marine WarningPHI53 min
Feb 21, 3:02 PM ESTSpecial Weather StatementPHICape May28 min
Feb 21, 3:40 PM ESTTornado WarningPHIMercer, Middlesex, Monmouth22 min
Feb 21, 4:00 PM ESTSevere Thunderstorm WarningPHIMonmouth13 min
Feb 21, 4:12 PM ESTSpecial Weather StatementPHISussex, Warren33 min
Feb 21, 4:17 PM ESTSpecial Marine WarningPHI58 min
Feb 21, 4:42 PM ESTSevere Thunderstorm WarningPHIOcean27 min
Feb 21, 4:52 PM ESTSpecial Weather StatementPHIMorris23 min
Feb 21, 4:53 PM ESTSpecial Marine WarningPHI54 min
Feb 21, 2:16 PM ESTSpecial Weather StatementPHICarbon, Lehigh, Monroe, Northampton44 min
Feb 21, 3:10 PM ESTWinter Weather AdvisoryPHICarbon, Monroe30 hr
Feb 21, 3:11 PM ESTSpecial Weather StatementPHIBerks49 min
Feb 21, 3:22 PM ESTSpecial Weather StatementPHICarbon, Monroe, Northampton38 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.