Alert archive / New Jersey / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 95, NWS Philadelphia/Mount Holly

July 9, 20155 counties in New Jersey; Chester County, Delaware County, Philadelphia County, Pennsylvania; Kent County, New Castle County, Delaware

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jul 9, 2015, 7:55 PM EDT for 5 counties in New Jersey; Chester County, Delaware County, Philadelphia County, Pennsylvania; Kent County, New Castle County, Delaware. It was in force for 40 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: Jul 9, 2015, 7:55 PM EDT (23:55 UTC)
Expired: Jul 9, 2015, 8:35 PM EDT
In force: 40 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

Counties Kent County, DE, New Castle County, DE, Burlington County, NJ, Camden County, NJ, Cumberland County, NJ, Gloucester County, NJ, Salem County, NJ, Chester County, PA, Delaware County, PA, Philadelphia County, PA

The radar

The Dover AFB radar (KDOX), 75 km from the middle of the area, began a volume at 23:54 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 9, 8:20 PM EDT	TSTM WND DMG	Pitman, NJ	WIRES DOWN EVENT TIME ESTIMATED BY RADAR
Jul 9, 8:30 PM EDT	TSTM WND DMG	Washington Twp, NJ	WIRES DOWN EVENT TIME ESTIMATED BY RADAR

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 9, 4:57 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Wallops Is Stn, VA (KWAL), launched 12:00Z, 11.9 hours before the alert went out and 174 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: 27 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 914 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: -19 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

974 
WUUS51 KPHI 092355
SVRPHI
DEC001-003-NJC005-007-011-015-033-PAC029-045-101-100045-
/O.NEW.KPHI.SV.W.0095.150709T2355Z-150710T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
755 PM EDT THU JUL 9 2015

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ  HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN NEW CASTLE COUNTY IN NORTHERN DELAWARE...
  NORTH CENTRAL KENT COUNTY IN CENTRAL DELAWARE...
  WESTERN CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  SALEM COUNTY IN SOUTHERN NEW JERSEY...
  GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  WEST CENTRAL BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN CUMBERLAND COUNTY IN SOUTHERN NEW JERSEY...
  SOUTHEASTERN DELAWARE COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  SOUTHEASTERN CHESTER COUNTY IN SOUTHEASTERN PENNSYLVANIA...
  SOUTH CENTRAL PHILADELPHIA COUNTY IN SOUTHEASTERN PENNSYLVANIA...

* UNTIL 845 PM EDT

* AT 753 PM EDT...DOPPLER RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS
  CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH. THESE STORMS
  WERE LOCATED OVER WOODSTOWN...OR 14 MILES EAST OF WILMINGTON...AND
  MOVING EAST AT 60 MPH.

* LOCATIONS IMPACTED INCLUDE...
  PHILADELPHIA...CAMDEN...WILMINGTON...VINELAND...MILLVILLE...
  BRIDGETON...GLOUCESTER CITY...CHERRY HILL...EVESHAM...MOUNT
  LAUREL...CHESTER...DEPTFORD...VOORHEES...WEST DEPTFORD...
  GLASSBORO...LINDENWOLD...PENNSVILLE...BELLMAWR...WOODBURY AND
  SMYRNA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...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.

&&

LAT...LON 3947 7560 3939 7553 3942 7545 3946 7554
      3951 7556 3949 7553 3954 7553 3952 7558
      3957 7551 3959 7555 3963 7555 3971 7549
      3984 7546 3996 7484 3929 7512 3929 7529
      3936 7539 3933 7546 3930 7544 3930 7566
TIME...MOT...LOC 2353Z 269DEG 53KT 3966 7528 

$$

GORSE/FRANCK

1 follow-up statement

360 
WWUS51 KPHI 100035
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
835 PM EDT THU JUL 9 2015

DEC001-003-NJC005-007-011-015-033-PAC029-045-101-100044-
/O.CAN.KPHI.SV.W.0095.000000T0000Z-150710T0045Z/
NEW CASTLE DE-KENT DE-CAMDEN NJ-SALEM NJ-GLOUCESTER NJ-BURLINGTON NJ-
CUMBERLAND NJ-DELAWARE PA-CHESTER PA-PHILADELPHIA PA-
835 PM EDT THU JUL 9 2015

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN NEW CASTLE...NORTH
CENTRAL KENT...WESTERN CAMDEN...SALEM...GLOUCESTER...WEST CENTRAL
BURLINGTON...NORTHWESTERN CUMBERLAND...SOUTHEASTERN DELAWARE...
SOUTHEASTERN CHESTER AND SOUTH CENTRAL PHILADELPHIA COUNTIES IS
CANCELLED...
        
THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE AREA...
THEREFORE THE WARNING HAS BEEN CANCELLED.

LAT...LON 3947 7560 3939 7553 3942 7545 3946 7554
      3951 7556 3949 7553 3954 7553 3952 7558
      3957 7551 3959 7555 3963 7555 3971 7549
      3984 7546 3996 7484 3929 7512 3929 7529
      3936 7539 3933 7546 3930 7544 3930 7566
TIME...MOT...LOC 0033Z 269DEG 53KT 3967 7456 

$$

GORSE/FRANCK

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 7:12 PM EDT	Severe Thunderstorm Warning	PHI	Hunterdon, Warren	48 min
Jul 9, 7:29 PM EDT	Severe Thunderstorm Warning	PHI	Salem	46 min
Jul 9, 7:39 PM EDT	Severe Thunderstorm Warning	PHI	Burlington, Camden, Gloucester, Mercer	66 min
Jul 9, 7:44 PM EDT	Special Marine Warning	PHI		31 min
Jul 9, 7:56 PM EDT	Areal Flood Advisory	PHI	Burlington, Camden, Gloucester, Hunterdon, Mercer, Ocean	4 hr
Jul 9, 6:15 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	45 min
Jul 9, 6:35 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	40 min
Jul 9, 6:46 PM EDT	Areal Flood Advisory	PHI	Carbon, Lehigh, Monroe, Northampton	4 hr
Jul 9, 6:50 PM EDT	Severe Thunderstorm Warning	PHI	Chester	40 min
Jul 9, 6:57 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Bucks, Chester, Lehigh, Montgomery	48 min
Jul 9, 7:21 PM EDT	Areal Flood Advisory	PHI	Berks, Lehigh	4 hr
Jul 9, 7:38 PM EDT	Severe Thunderstorm Warning	PHI	Kent, New Castle	52 min

Nearby

Severe Thunderstorm Warnings in New Jersey, 2015 Severe Thunderstorm Warnings in Pennsylvania, 2015 Severe Thunderstorm Warnings in Delaware, 2015 Every severe thunderstorm warning in 2015

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.