Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 19, NWS Philadelphia/Mount Holly

April 2, 20165 counties in Pennsylvania; 5 counties in New Jersey; New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 2, 2016, 11:09 PM EDT for 5 counties in Pennsylvania; 5 counties in New Jersey; New Castle County, Delaware. It was in force for 51 min. 7 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 2, 2016, 11:09 PM EDT (03:09 UTC)
Expired: Apr 3, 2016, 12:00 AM EDT
In force: 51 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties New Castle County, DE, Burlington County, NJ, Camden County, NJ, Gloucester County, NJ, Mercer County, NJ, Salem County, NJ, Bucks County, PA, Chester County, PA, Delaware County, PA, Montgomery County, PA, Philadelphia County, PA

The radar

The Philadelphia radar (KDIX), 87 km from the middle of the area, began a volume at 03:08 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 2, 11:15 PM EDT	TSTM WND GST 53	New Castle County Airpo, DE
Apr 2, 11:15 PM EDT	HAIL 1	Wilmington, DE
Apr 2, 11:20 PM EDT	HAIL 0.25	Media, PA
Apr 2, 11:22 PM EDT	HAIL 0.75	Upper Darby, PA	PENNY SIZE HAIL REPORTED IN UPPER DARBY.
Apr 2, 11:29 PM EDT	TSTM WND GST 55	New Castle County Airpo, DE
Apr 2, 11:45 PM EDT	TSTM WND GST 59	Ne Philadelphia Airport, PA
Apr 2, 11:55 PM EDT	TSTM WND GST 52	Marlton, NJ

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

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 3.2 hours before the alert went out and 197 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2870 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

575 
WUUS51 KPHI 030309
SVRPHI
DEC003-NJC005-007-015-021-033-PAC017-029-045-091-101-030400-
/O.NEW.KPHI.SV.W.0019.160403T0309Z-160403T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1109 PM EDT SAT APR 2 2016

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  NORTHWESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN MERCER COUNTY IN CENTRAL NEW JERSEY...
  NORTHWESTERN SALEM COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  SOUTHEASTERN CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  SOUTHEASTERN BUCKS COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  DELAWARE COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  PHILADELPHIA COUNTY IN SOUTHEASTERN PENNSYLVANIA...

* UNTIL MIDNIGHT EDT

* AT 1108 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
  THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
  MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM NEAR
  MARSHALLTON TO NEAR GLASGOW...AND MOVING NORTHEAST AT 60 TO 70
  MPH. HALF INCH DIAMETER HAIL MAY ALSO ACCOMPANY THE DAMAGING WINDS.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  WEST CHESTER...WESTTOWN...GRADYVILLE...CHEYNEY AND LIMA AROUND 1115 
  PM EDT. 
  CARNEYS POINT...PENNS GROVE...PAOLI...NEWTOWN SQUARE...TROUT LAKE...
  BROOMALL AND TALLEYVILLE AROUND 1120 PM EDT. 
  NORRISTOWN...WEST NORRITON...EAST NORRITON...CONSHOHOCKEN...NARBERTH...
  ARDEN...KING OF PRUSSIA...RADNOR TOWNSHIP...BRYN MAWR AND CHELSEA 
  AROUND 1125 PM EDT. 
  CHESTER...AMBLER...SWARTHMORE...SWEDESBORO...PLYMOUTH MEETING...
  GIBBSTOWN...BECKETT...PHILADELPHIA INTERNATIONAL ARPT...CHESTNUT HILL 
  AND CHESTER TOWNSHIP AROUND 1130 PM EDT. 
  DEPTFORD...WEST DEPTFORD...YEADON...FOLCROFT...PAULSBORO...JENKINTOWN...
  WOODBURY HEIGHTS...NATIONAL PARK...EAST LANSDOWNE AND ROCKLEDGE 
  AROUND 1135 PM EDT. 
  PHILADELPHIA...GLOUCESTER CITY...BELLMAWR...WOODBURY...HATBORO...
  WESTVILLE...BROOKLAWN...BRYN ATHYN...IVYLAND AND AUDUBON PARK AROUND 
  1140 PM EDT. 
  CAMDEN...CHERRY HILL...VOORHEES...LINDENWOLD...MAGNOLIA...NEWTOWN...
  LANGHORNE...RICHBORO...ERLTON-ELLISBURG AND ASHLAND AROUND 1145 PM 
  EDT. 
  EVESHAM...MOUNT LAUREL...RIVERSIDE...PALMYRA...YARDLEY...RAMBLEWOOD...
  WASHINGTON CROSSING...WASHINGTON CROSSING...GREENTREE AND WOODSIDE 
  AROUND 1150 PM EDT. 

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE
ORELAND...MARCUS HOOK...LAWNSIDE...BARRINGTON...WOODLYN...BOOTHWYN...
TRAINER...SPRINGFIELD...WEST CONSHOHOCKEN AND EDGEWATER PARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL...DEADLY
LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...FREQUENT CLOUD TO
GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS
IMMEDIATELY. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE
ENOUGH TO BE STRUCK BY LIGHTNING.

&&

LAT...LON 3997 7567 4037 7480 3987 7487 3968 7551
      3971 7549 3972 7551 3967 7555 3961 7574
TIME...MOT...LOC 0308Z 240DEG 59KT 3995 7564 3963 7572 

$$

DRAG

1 follow-up statement

962 
WWUS51 KPHI 030335
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1135 PM EDT SAT APR 2 2016

DEC003-NJC005-007-015-021-033-PAC017-029-045-091-101-030400-
/O.CON.KPHI.SV.W.0019.000000T0000Z-160403T0400Z/
NEW CASTLE DE-CAMDEN NJ-GLOUCESTER NJ-MERCER NJ-SALEM NJ-
BURLINGTON NJ-CHESTER PA-BUCKS PA-DELAWARE PA-MONTGOMERY PA-
PHILADELPHIA PA-
1135 PM EDT SAT APR 2 2016

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT EDT
FOR NORTHEASTERN NEW CASTLE...NORTHWESTERN CAMDEN...NORTHWESTERN
GLOUCESTER...NORTHWESTERN MERCER...NORTHWESTERN SALEM...NORTHWESTERN
BURLINGTON...SOUTHEASTERN CHESTER...SOUTHEASTERN BUCKS...SOUTHEASTERN
DELAWARE...SOUTHEASTERN MONTGOMERY AND PHILADELPHIA COUNTIES...

AT 1134 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM ROCKLEDGE
TO WEST DEPTFORD...MOVING NORTHEAST AT 70 MPH. PENNY SIZE HAIL MAY
ALSO ACCOMPANY THE DAMAGING WINDS.

THESE SEVERE STORMS WILL BE NEAR...
  BENSALEM...BURLINGTON...BEVERLY...NEWTOWN...LANGHORNE...BRYN ATHYN...
  LANGHORN...FEASTERVILLE-TREVOSE...FEASTERVILLE AND ANDALUSIA AROUND 
  1140 PM EDT. 
  EVESHAM...MOUNT LAUREL...BRISTOL...PALMYRA...YARDLEY...LEVITTOWN...
  MARLTON...RAMBLEWOOD...WOODSIDE AND WASHINGTON CROSSING AROUND 1145 
  PM EDT. 
  EWING...WILLINGBORO AND RIVERSIDE AROUND 1150 PM EDT. 

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE
ORELAND...MARCUS HOOK...LAWNSIDE...BARRINGTON...WOODLYN...TRAINER...
EDGEWATER PARK...COLWYN...GLENOLDEN AND DELANCO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

IN ADDITION TO HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO GROUND
LIGHTNING IS OCCURRING WITH THIS STORM.  MOVE INDOORS IMMEDIATELY.
REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE
STRUCK BY LIGHTNING.

&&

LAT...LON 4017 7515 4037 7480 3987 7487 3968 7551
      3971 7549 3971 7551 3967 7555 3982 7541
TIME...MOT...LOC 0334Z 242DEG 71KT 4010 7506 3982 7522 

$$

DRAG

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 2, 9:45 PM EDT	Special Weather Statement	PHI	Berks, Bucks, Chester, Delaware, Montgomery, Philadelphia	2 hr
Apr 2, 10:51 PM EDT	Severe Thunderstorm Warning	PHI	Chester, Delaware	39 min
Apr 2, 11:56 PM EDT	Severe Thunderstorm Warning	PHI	Bucks	34 min
Apr 3, 11:34 AM EDT	Wind Advisory	PHI	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	4 hr
Apr 3, 3:40 PM EDT	Freeze Watch	PHI	Bucks, Chester, Delaware, Montgomery, Philadelphia	12 hr
Apr 2, 10:02 PM EDT	Special Weather Statement	PHI	Gloucester, Salem	88 min
Apr 2, 10:08 PM EDT	Special Weather Statement	PHI	Cumberland	37 min
Apr 2, 10:27 PM EDT	Special Weather Statement	PHI	Atlantic, Cumberland	33 min
Apr 2, 11:02 PM EDT	Special Marine Warning	PHI		88 min
Apr 2, 11:24 PM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cumberland, Gloucester, Salem	51 min
Apr 2, 11:40 PM EDT	Special Marine Warning	PHI		65 min
Apr 3, 12:08 AM EDT	Special Weather Statement	PHI	Cape May	22 min
Apr 3, 12:14 AM EDT	Severe Thunderstorm Warning	PHI	Atlantic, Burlington, Camden, Cape May, Cumberland, Ocean	31 min
Apr 3, 12:19 AM EDT	Special Weather Statement	PHI	Union	26 min
Apr 3, 12:23 AM EDT	Special Marine Warning	PHI		52 min
Apr 3, 12:30 AM EDT	Special Marine Warning	PHI		60 min
Apr 3, 12:39 AM EDT	Special Weather Statement	PHI	Monmouth	21 min
Apr 3, 12:46 AM EDT	Severe Thunderstorm Warning	PHI	Monmouth, Ocean	14 min
Apr 3, 12:52 AM EDT	Special Weather Statement	PHI	Ocean	8 min
Apr 3, 1:12 AM EDT	Special Marine Warning	PHI		33 min
Apr 3, 5:45 AM EDT	Low Water Advisory	PHI		9 hr
Apr 3, 11:37 AM EDT	Gale Warning	PHI		4 hr
Apr 3, 3:07 PM EDT	Low Water Advisory	PHI		113 min
Apr 3, 3:54 PM EDT	Gale Watch	PHI		12 hr
Apr 3, 3:54 PM EDT	Small Craft Advisory	PHI		5 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2016 Severe Thunderstorm Warnings in New Jersey, 2016 Severe Thunderstorm Warnings in Delaware, 2016 Every severe thunderstorm warning in 2016

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.