Alert archive / New Jersey / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 203, NWS Philadelphia/Mount Holly

July 15, 2023Bucks County, Pennsylvania; Mercer County, Middlesex County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 15, 2023, 5:12 PM EDT for Bucks County, Pennsylvania; Mercer County, Middlesex County, New Jersey. It was in force for 63 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: Jul 15, 2023, 5:12 PM EDT (21:12 UTC)
Expired: Jul 15, 2023, 6:15 PM EDT
In force: 63 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Philadelphia radar (KDIX), 43 km from the middle of the area, began a volume at 21:13 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
Jul 15, 5:27 PM EDT	TSTM WND DMG	2 Se Washington Crossin, NJ	Tree fell onto a house on Montague Avenue in Ewing. 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, 9.2 hours before the alert went out and 164 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1125 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 596 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 100 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted.

546 
WUUS51 KPHI 152112
SVRPHI
NJC021-023-PAC017-152215-
/O.NEW.KPHI.SV.W.0203.230715T2112Z-230715T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
512 PM EDT Sat Jul 15 2023

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Mercer County in central New Jersey...
  Southern Middlesex County in northern New Jersey...
  Southeastern Bucks County in southeastern Pennsylvania...

* Until 615 PM EDT.

* At 512 PM EDT, severe thunderstorms were located along a line
  extending from near Plainsboro Center to Newtown, moving east at 5
  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, Old Bridge, East Brunswick, South Brunswick, North
  Brunswick, Ewing, Princeton, Jamesburg, Hightstown, Cranbury,
  Pennington, Yardley, Newtown, Tullytown, Langhorne, Ivyland,
  Brownville, Richboro, White Horse and Twin Rivers.

This includes the following highways...
 New Jersey Turnpike between exits 8 and 9.
 Pennsylvania Turnpike between mile markers 355 and 358.
 Interstate 95 in Pennsylvania near mile marker 40.
 Interstate 195 in New Jersey between mile markers 0 and 7.
 Interstate 295 in New Jersey between mile markers 59 and 76.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4018 7460 4016 7466 4018 7471 4015 7472
      4011 7488 4020 7508 4031 7498 4039 7465
      4037 7461 4040 7459 4042 7459 4046 7448
      4046 7430 4039 7427
TIME...MOT...LOC 2112Z 278DEG 6KT 4031 7463 4022 7491 

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

$$

Staarmann

3 follow-up statements

045 
WWUS51 KPHI 152128
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
528 PM EDT Sat Jul 15 2023

NJC021-023-PAC017-152215-
/O.CON.KPHI.SV.W.0203.000000T0000Z-230715T2215Z/
Mercer NJ-Middlesex NJ-Bucks PA-
528 PM EDT Sat Jul 15 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR MERCER...SOUTHERN MIDDLESEX AND SOUTHEASTERN BUCKS COUNTIES...

At 527 PM EDT, severe thunderstorms were located along a line
extending from East Brunswick to Pennington to near Woodside, moving 
east at 5 mph. This storm has a history of producing wind damage in 
South Brunswick.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Law enforcement.

IMPACT...Minor damage to vehicles is possible. Wind damage to roofs, 
         siding, trees, and power lines is possible.

Locations impacted include...
Trenton, Old Bridge, East Brunswick, South Brunswick, North
Brunswick, Ewing, Princeton, Jamesburg, Hightstown, Cranbury,
Pennington, Yardley, Newtown, Tullytown, Langhorne, Ivyland,
Brownville, Richboro, White Horse and Twin Rivers.

This includes the following highways...
 New Jersey Turnpike between exits 8 and 9.
 Pennsylvania Turnpike between mile markers 355 and 358.
 Interstate 95 in Pennsylvania near mile marker 40.
 Interstate 195 in New Jersey between mile markers 0 and 7.
 Interstate 295 in New Jersey between mile markers 59 and 76.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4018 7460 4016 7466 4018 7471 4015 7472
      4011 7488 4020 7508 4031 7498 4039 7465
      4037 7461 4040 7459 4042 7459 4046 7448
      4046 7430 4039 7427
TIME...MOT...LOC 2127Z 265DEG 5KT 4042 7445 4030 7479 4025 7490 

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

$$

Staarmann

527 
WWUS51 KPHI 152154
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
554 PM EDT Sat Jul 15 2023

NJC021-023-PAC017-152215-
/O.CON.KPHI.SV.W.0203.000000T0000Z-230715T2215Z/
Mercer NJ-Middlesex NJ-Bucks PA-
554 PM EDT Sat Jul 15 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM EDT
FOR MERCER...SOUTHERN MIDDLESEX AND SOUTHEASTERN BUCKS COUNTIES...

At 552 PM EDT, severe thunderstorms were located along a line 
extending from Sayreville to Ewing to Langhorn, moving east at 5 
mph. This cluster of storms has a history of producing wind damage.

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, Old Bridge, East Brunswick, South Brunswick, North
Brunswick, Ewing, Princeton, Jamesburg, Hightstown, Cranbury,
Pennington, Yardley, Newtown, Tullytown, Langhorne, Ivyland,
Brownville, Richboro, White Horse and Twin Rivers.

This includes the following highways...
 New Jersey Turnpike between exits 8 and 9.
 Pennsylvania Turnpike between mile markers 355 and 358.
 Interstate 95 in Pennsylvania near mile marker 40.
 Interstate 195 in New Jersey between mile markers 0 and 7.
 Interstate 295 in New Jersey between mile markers 59 and 76.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4018 7460 4016 7466 4018 7471 4015 7472
      4011 7488 4020 7508 4031 7498 4039 7465
      4037 7461 4040 7459 4042 7459 4046 7448
      4046 7430 4039 7427
TIME...MOT...LOC 2152Z 286DEG 5KT 4044 7432 4028 7480 4019 7490 

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

$$

Staarmann

598 
WWUS51 KPHI 152213
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
613 PM EDT Sat Jul 15 2023

NJC021-023-PAC017-152223-
/O.EXP.KPHI.SV.W.0203.000000T0000Z-230715T2215Z/
Mercer NJ-Middlesex NJ-Bucks PA-
613 PM EDT Sat Jul 15 2023

...THE SEVERE THUNDERSTORM WARNING FOR MERCER...SOUTHERN MIDDLESEX
AND SOUTHEASTERN BUCKS COUNTIES WILL EXPIRE AT 615 PM EDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty 
winds and heavy rain are still possible with these thunderstorms. A 
Flash Flood Warning remains in effect for portions of the area.

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 4018 7460 4016 7466 4018 7471 4015 7472
      4011 7488 4020 7508 4031 7498 4039 7465
      4037 7461 4040 7459 4042 7459 4046 7448
      4046 7430 4039 7427
TIME...MOT...LOC 2213Z 278DEG 6KT 4044 7428 4028 7476 4019 7486 

$$

Staarmann

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 14, 8:50 PM EDT	Areal Flood Advisory	PHI	Carbon, Lehigh, Monroe, Northampton	3 hr
Jul 15, 3:44 AM EDT	Flood Watch	PHI	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	38 hr
Jul 15, 1:46 PM EDT	Special Weather Statement	PHI	Montgomery	29 min
Jul 15, 3:35 PM EDT	Special Weather Statement	PHI	Berks	25 min
Jul 15, 3:51 PM EDT	Special Weather Statement	PHI	Bucks	24 min
Jul 15, 4:08 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	67 min
Jul 15, 4:31 PM EDT	Areal Flood Advisory	PHI	Bucks	106 min
Jul 15, 5:18 PM EDT	Flash Flood Warning	PHI	Bucks	4 hr
Jul 15, 6:09 PM EDT	Flash Flood Warning Considerable damage threat	PHI	Bucks	4 hr
Jul 15, 7:46 PM EDT	Special Weather Statement	PHI	Carbon	29 min
Jul 15, 7:53 PM EDT	Severe Thunderstorm Warning	PHI	Carbon	52 min
Jul 14, 8:05 PM EDT	Special Weather Statement	PHI	Morris	40 min
Jul 14, 8:29 PM EDT	Flash Flood Warning	PHI	Morris	4 hr
Jul 14, 9:13 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Somerset, Warren	3 hr
Jul 14, 9:51 PM EDT	Special Weather Statement	PHI	Morris, Somerset	24 min
Jul 14, 9:57 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Morris, Somerset	41 min
Jul 14, 11:32 PM EDT	Special Weather Statement	PHI	Mercer, Monmouth	28 min
Jul 15, 1:33 PM EDT	Special Marine Warning	PHI		57 min
Jul 15, 1:43 PM EDT	Special Weather Statement	PHI	Salem	32 min
Jul 15, 2:56 PM EDT	Special Weather Statement	PHI	Mercer	34 min
Jul 15, 3:08 PM EDT	Special Weather Statement	PHI	Hunterdon	37 min
Jul 15, 3:22 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Somerset	38 min
Jul 15, 3:29 PM EDT	Special Marine Warning	PHI		61 min
Jul 15, 3:30 PM EDT	Special Weather Statement	PHI	Salem	30 min
Jul 15, 3:40 PM EDT	Severe Thunderstorm Warning	PHI	Cumberland, Salem	65 min
Jul 15, 4:11 PM EDT	Special Weather Statement	PHI	Gloucester	34 min
Jul 15, 4:52 PM EDT	Special Weather Statement	PHI	Cumberland	23 min
Jul 15, 4:53 PM EDT	Special Weather Statement	PHI	Middlesex	37 min
Jul 15, 5:00 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Mercer, Middlesex, Somerset	2 hr
Jul 15, 5:27 PM EDT	Areal Flood Advisory	PHI	Cumberland, Salem	99 min
Jul 15, 5:45 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Morris, Sussex, Warren	45 min
Jul 15, 5:49 PM EDT	Severe Thunderstorm Warning	PHI	Middlesex, Monmouth	41 min
Jul 15, 6:21 PM EDT	Special Weather Statement	PHI	Mercer	24 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2023 Severe Thunderstorm Warnings in Pennsylvania, 2023 Every 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.