Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 281, NWS Philadelphia/Mount Holly

July 31, 20194 counties in Pennsylvania; 4 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 31, 2019, 1:30 PM EDT for 4 counties in Pennsylvania; 4 counties in New Jersey. It was in force for 45 min. 3 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: Jul 31, 2019, 1:30 PM EDT (17:30 UTC)
Expired: Jul 31, 2019, 2:15 PM EDT
In force: 45 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Mercer County, NJ, Bucks County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 55 km from the middle of the area, began a volume at 17:29 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 31, 1:30 PM EDT	TSTM WND DMG	Bristol, PA	TREES DOWN ON WIRES RESULTING IN SOME POWER OUTAGES. DELAYED REPORT.
Jul 31, 1:36 PM EDT	HAIL 0.75	Holmesburg, PA	MPING REPORT OF .75 INCH HAIL.
Jul 31, 1:38 PM EDT	TSTM WND DMG	1 Wnw Holmesburg, PA	MPING REPORT OF TREES UPROOTED;ROOF BLOWN OFF IN PHILADELPHIA COUNTY, PA.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 31, 1:17 PM EDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Brookhaven, NY (KOKX), launched 12:00Z, 5.5 hours before the alert went out and 211 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: 885 J/kg
Mixed-layer CIN: -80 J/kg
Mixed-layer LCL: 1207 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 33 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

Open this sounding in Storm Lab

The text

As transmitted.

678 
WUUS51 KPHI 311730
SVRPHI
NJC005-007-015-021-PAC017-045-091-101-311815-
/O.NEW.KPHI.SV.W.0281.190731T1730Z-190731T1815Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Mount Holly NJ
130 PM EDT Wed Jul 31 2019

The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
  Northwestern Camden County in southern New Jersey...
  Southwestern Mercer County in central New Jersey...
  North central Gloucester County in southern New Jersey...
  Northwestern Burlington County in southern New Jersey...
  Southeastern Montgomery County in southeastern Pennsylvania...
  Southeastern Bucks County in southeastern Pennsylvania...
  Philadelphia County in southeastern Pennsylvania...
  Northeastern Delaware County in southeastern Pennsylvania...

* Until 215 PM EDT.

* At 129 PM EDT, a severe thunderstorm was located over Philadelphia,
  moving east at 15 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Damage to roofs, siding, trees, and power lines is 
           possible.

* Locations impacted include...
  Philadelphia, Trenton, Camden, Gloucester City, Cherry Hill,
  Bensalem, Mount Laurel, Ewing, Willingboro, Lindenwold, Florence,
  Bellmawr, Yeadon, Woodbury, Burlington, Bristol, Riverside,
  Palmyra, Hatboro and Jenkintown.

This includes the following highways...
 Interstate 195 in New Jersey near mile marker 0.
 Interstate 295 in New Jersey between mile markers 24 and 51, and
between mile markers 58 and 60.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3983 7499 3984 7512 3985 7514 3986 7517
      3996 7539 4031 7492 4017 7469
TIME...MOT...LOC 1729Z 277DEG 15KT 4001 7515 

HAIL...<.75IN
WIND...60MPH
 
$$

NC

1 follow-up statement

575 
WWUS51 KPHI 311802
SVSPHI

Severe Weather Statement
National Weather Service Mount Holly NJ
202 PM EDT Wed Jul 31 2019

NJC007-015-PAC045-311811-
/O.CAN.KPHI.SV.W.0281.000000T0000Z-190731T1815Z/
Camden NJ-Gloucester NJ-Delaware PA-
202 PM EDT Wed Jul 31 2019

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CAMDEN...NORTH
CENTRAL GLOUCESTER AND NORTHEASTERN DELAWARE COUNTIES 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 900 PM EDT for
southern and central New Jersey...and southeastern Pennsylvania.

LAT...LON 3995 7488 4014 7515 4031 7492 4017 7469
TIME...MOT...LOC 1801Z 220DEG 26KT 4021 7483 

$$

NJC005-021-PAC017-091-101-311815-
/O.CON.KPHI.SV.W.0281.000000T0000Z-190731T1815Z/
Mercer NJ-Burlington NJ-Montgomery PA-Bucks PA-Philadelphia PA-
202 PM EDT Wed Jul 31 2019

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 PM EDT
FOR SOUTHWESTERN MERCER...NORTHWESTERN BURLINGTON...EAST CENTRAL
MONTGOMERY...SOUTHEASTERN BUCKS AND NORTHEASTERN PHILADELPHIA
COUNTIES...

At 201 PM EDT, a severe thunderstorm was located over Woodside, or
near Trenton, moving northeast at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Damage to roofs, siding, trees, and power lines is 
         possible.

Locations impacted include...
Philadelphia, Trenton, Bensalem, Ewing, Willingboro, Florence,
Burlington, Bristol, Riverside, Hatboro, Bordentown, Beverly,
Yardley, Newtown, Tullytown, Abington, Langhorne, Bryn Athyn,
Feasterville-Trevose and Willow Grove.

This includes the following highways...
 Interstate 195 in New Jersey near mile marker 0.
 Interstate 295 in New Jersey between mile markers 41 and 51, and
between mile markers 58 and 60.

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 3995 7488 4014 7515 4031 7492 4017 7469
TIME...MOT...LOC 1801Z 220DEG 26KT 4021 7483 

HAIL...<.75IN
WIND...60MPH
 
$$

Fitzsimmons

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 30, 10:45 PM EDT	Special Weather Statement	PHI	Berks	45 min
Jul 30, 11:38 PM EDT	Special Weather Statement	PHI	Lehigh	52 min
Jul 31, 12:06 AM EDT	Special Weather Statement	PHI	Carbon	39 min
Jul 31, 3:28 AM EDT	Flash Flood Watch	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	17 hr
Jul 31, 1:02 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Montgomery, Philadelphia	28 min
Jul 31, 1:14 PM EDT	Areal Flood Advisory	PHI	Bucks, Delaware, Montgomery, Philadelphia	3 hr
Jul 31, 1:19 PM EDT	Flash Flood Warning	PHI	Bucks, Delaware, Philadelphia	5 hr
Jul 31, 1:46 PM EDT	Flash Flood Warning	PHI	Bucks	3 hr
Jul 31, 2:11 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	49 min
Jul 31, 2:27 PM EDT	Areal Flood Advisory	PHI	Berks, Chester, Montgomery	3 hr
Jul 31, 2:32 PM EDT	Areal Flood Advisory	PHI	Bucks, Delaware, Philadelphia	3 hr
Jul 31, 2:46 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	44 min
Jul 31, 3:24 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	51 min
Jul 31, 3:49 PM EDT	Severe Thunderstorm Warning	PHI	Bucks, Delaware, Montgomery, Philadelphia	41 min
Jul 31, 4:36 PM EDT	Areal Flood Advisory	PHI	Bucks, Monroe, Northampton	4 hr
Jul 31, 4:52 PM EDT	Severe Thunderstorm Warning	PHI	Monroe, Northampton	38 min
Jul 31, 4:58 PM EDT	Flash Flood Warning	PHI	Monroe	4 hr
Jul 31, 1:43 PM EDT	Special Marine Warning	PHI		62 min
Jul 31, 1:49 PM EDT	Special Marine Warning	PHI		86 min
Jul 31, 1:57 PM EDT	Special Weather Statement	PHI	Ocean	33 min
Jul 31, 2:21 PM EDT	Areal Flood Advisory	PHI	Ocean	4 hr
Jul 31, 2:23 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	52 min
Jul 31, 2:29 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Mercer, Monmouth, Ocean	46 min
Jul 31, 2:29 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	46 min
Jul 31, 2:53 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth	52 min
Jul 31, 3:00 PM EDT	Areal Flood Advisory	PHI	Monmouth, Ocean	3 hr
Jul 31, 3:05 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	40 min
Jul 31, 3:06 PM EDT	Special Marine Warning	PHI		54 min
Jul 31, 3:20 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Middlesex, Morris, Somerset	40 min
Jul 31, 3:24 PM EDT	Flash Flood Warning	PHI	Monmouth	4 hr
Jul 31, 3:39 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Middlesex, Morris, Somerset, Sussex, Warren	4 hr
Jul 31, 3:39 PM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	51 min
Jul 31, 3:48 PM EDT	Flash Flood Warning	PHI	Ocean	2 hr
Jul 31, 3:51 PM EDT	Special Marine Warning	PHI		54 min
Jul 31, 3:58 PM EDT	Severe Thunderstorm Warning	PHI	Morris, Somerset	17 min
Jul 31, 5:02 PM EDT	Special Weather Statement	PHI	Atlantic	28 min
Jul 31, 5:16 PM EDT	Special Weather Statement	PHI	Atlantic	44 min
Jul 31, 5:27 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Cumberland, Ocean, Salem	48 min
Jul 31, 5:41 PM EDT	Areal Flood Advisory	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Gloucester and 2 more	3 hr
Jul 31, 5:44 PM EDT	Severe Thunderstorm Warning	PHI	Sussex	25 min
Jul 31, 5:51 PM EDT	Special Marine Warning	PHI		54 min
Jul 31, 5:55 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Ocean	35 min
Jul 31, 5:57 PM EDT	Special Marine Warning	PHI		63 min
Jul 31, 6:05 PM EDT	Special Marine Warning	PHI		55 min
Jul 31, 6:41 PM EDT	Special Marine Warning	PHI		64 min
Jul 31, 6:53 PM EDT	Special Marine Warning	PHI		54 min
Jul 31, 7:36 PM EDT	Special Marine Warning	PHI		54 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2019 Severe Thunderstorm Warnings in New Jersey, 2019 Every severe thunderstorm warning in 2019

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.