Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 33, NWS Philadelphia/Mount Holly

April 15, 2023Bucks County, Philadelphia County, Pennsylvania; Burlington County, Mercer County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 15, 2023, 4:05 PM EDT for Bucks County, Philadelphia County, Pennsylvania; Burlington County, Mercer County, New Jersey. It was in force for 25 min. 2 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 15, 2023, 4:05 PM EDT (20:05 UTC)
Expired: Apr 15, 2023, 4:30 PM EDT
In force: 25 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Burlington County, NJ, Mercer County, NJ, Bucks County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 46 km from the middle of the area, began a volume at 20:04 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 15, 4:05 PM EDT	HAIL 1	1 Wnw South Jersey Regi, NJ	MOUNT LAUREL TOWNSHIP.
Apr 15, 4:23 PM EDT	TSTM WND DMG	3 Ene Moorestown, NJ	CORRECTS PREVIOUS TSTM WND DMG REPORT FROM 3 ENE MOORESTOWN. MULTIPLE LARGE TREE LIMBS DOWN ACROSS PORTIONS OF HARTFORD ROAD JUST NORTH OF MARNE HIGHWAY.

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, 8.1 hours before the alert went out and 199 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: 26 J/kg
Mixed-layer CIN: -187 J/kg
Mixed-layer LCL: 927 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: 26 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

200 
WUUS51 KPHI 152005
SVRPHI
NJC005-021-PAC017-101-152030-
/O.NEW.KPHI.SV.W.0033.230415T2005Z-230415T2030Z/

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

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  South central Mercer County in central New Jersey...
  Northwestern Burlington County in southern New Jersey...
  Southeastern Bucks County in southeastern Pennsylvania...
  Northeastern Philadelphia County in southeastern Pennsylvania...

* Until 430 PM EDT.

* At 405 PM EDT, a severe thunderstorm was located over Mount Laurel,
  or 11 miles east of Camden, moving north at 25 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Minor damage to vehicles is possible.

* Locations impacted include...
  Philadelphia, Trenton, Bensalem, Evesham, Mount Laurel,
  Willingboro, Medford, Lumberton, Florence, Burlington, Bristol,
  Mount Holly, Riverside, Palmyra, Beverly, Tullytown, Langhorne,
  Ivyland, Feasterville-Trevose and Florence-Roebling.

This includes the following highways...
 New Jersey Turnpike between exits 4 and 6A.
 Pennsylvania Turnpike between mile markers 347 and 359.
 Interstate 95 in Pennsylvania between mile markers 30 and 40.
 Interstate 295 in New Jersey between mile markers 37 and 54.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3988 7476 3987 7493 3991 7495 3993 7498
      3994 7498 3995 7501 4012 7505 4014 7502
      4016 7506 4021 7507 4023 7472
TIME...MOT...LOC 2005Z 177DEG 21KT 3996 7488 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

Hoeflich

2 follow-up statements

573 
WWUS51 KPHI 152016
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
416 PM EDT Sat Apr 15 2023

NJC021-152026-
/O.CAN.KPHI.SV.W.0033.000000T0000Z-230415T2030Z/
Mercer NJ-
416 PM EDT Sat Apr 15 2023

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL MERCER COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3990 7476 3990 7495 3995 7495 3999 7497
      4011 7500 4015 7500 4015 7473 4006 7474
      3994 7475
TIME...MOT...LOC 2016Z 175DEG 15KT 3999 7488 

$$

NJC005-PAC017-101-152030-
/O.CON.KPHI.SV.W.0033.000000T0000Z-230415T2030Z/
Burlington NJ-Bucks PA-Philadelphia PA-
416 PM EDT Sat Apr 15 2023

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM EDT
FOR NORTHWESTERN BURLINGTON...SOUTHEASTERN BUCKS AND NORTHEASTERN
PHILADELPHIA COUNTIES...

At 416 PM EDT, a severe thunderstorm was located over Willingboro, or
12 miles east of Camden, moving north at 15 mph.

HAZARD...Quarter size hail.

SOURCE...Trained weather spotters. At 4:05 PM, an NWS employee 
         reported quarter-sized hail in Mount Laurel, NJ.

IMPACT...Minor damage to vehicles is possible.

Locations impacted include...
Philadelphia, Bensalem, Mount Laurel, Willingboro, Medford,
Lumberton, Florence, Burlington, Bristol, Mount Holly, Riverside,
Beverly, Tullytown, Florence-Roebling, Marlton, Jacksonville,
Andalusia, Ramblewood, Feasterville-Trevose and Levittown.

This includes the following highways...
 New Jersey Turnpike between exits 5 and 6A.
 Pennsylvania Turnpike between mile markers 350 and 359.
 Interstate 95 in Pennsylvania between mile markers 33 and 40.
 Interstate 295 in New Jersey between mile markers 38 and 54.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3990 7476 3990 7495 3995 7495 3999 7497
      4011 7500 4015 7500 4015 7473 4006 7474
      3994 7475
TIME...MOT...LOC 2016Z 175DEG 15KT 3999 7488 

HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

Hoeflich

174 
WWUS51 KPHI 152025
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
425 PM EDT Sat Apr 15 2023

NJC005-PAC017-101-152035-
/O.EXP.KPHI.SV.W.0033.000000T0000Z-230415T2030Z/
Burlington NJ-Bucks PA-Philadelphia PA-
425 PM EDT Sat Apr 15 2023

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BURLINGTON...
SOUTHEASTERN BUCKS AND NORTHEASTERN PHILADELPHIA COUNTIES WILL EXPIRE
AT 430 PM EDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small hail
is still possible with this thunderstorm.

LAT...LON 3990 7476 3990 7495 3995 7495 3999 7497
      4011 7500 4015 7500 4015 7473 4006 7474
      3994 7475
TIME...MOT...LOC 2025Z 177DEG 21KT 4003 7488 

$$

Hoeflich

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 12:42 PM EDT	Special Weather Statement	PHI	Northampton	48 min
Apr 15, 1:03 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	27 min
Apr 15, 1:22 PM EDT	Flash Flood Warning	PHI	Lehigh, Northampton	4 hr
Apr 15, 1:34 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	26 min
Apr 15, 1:51 PM EDT	Severe Thunderstorm Warning	PHI	Chester	24 min
Apr 15, 1:58 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	32 min
Apr 15, 2:02 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Lehigh, Northampton	28 min
Apr 15, 2:17 PM EDT	Areal Flood Advisory	PHI	Chester	3 hr
Apr 15, 4:56 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	14 min
Apr 15, 5:20 PM EDT	Flash Flood Warning	PHI	Lehigh	3 hr
Apr 15, 6:05 PM EDT	Areal Flood Advisory	PHI	Bucks	96 min
Apr 15, 4:29 AM EDT	Marine Dense Fog Advisory	PHI		54 hr
Apr 15, 1:09 PM EDT	Special Weather Statement	PHI	Sussex	36 min
Apr 15, 1:49 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	26 min
Apr 15, 1:55 PM EDT	Areal Flood Advisory	PHI	Sussex	6 hr
Apr 15, 2:06 PM EDT	Areal Flood Advisory	PHI	Mercer, Middlesex, Somerset	6 hr
Apr 15, 3:28 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Sussex, Warren	3 hr
Apr 15, 3:29 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Gloucester	31 min
Apr 15, 3:58 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester	3 hr
Apr 15, 4:19 PM EDT	Flash Flood Warning	PHI	Burlington, Camden	3 hr
Apr 15, 4:49 PM EDT	Severe Thunderstorm Warning	PHI	Mercer, Middlesex, Somerset	26 min
Apr 15, 6:32 PM EDT	Areal Flood Warning	PHI	Hunterdon	5 hr

Nearby

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