Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 10, NWS Philadelphia/Mount Holly

April 22, 20144 counties in Pennsylvania; 4 counties in New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 22, 2014, 7:52 PM EDT for 4 counties in Pennsylvania; 4 counties in New Jersey. It was in force for 38 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 22, 2014, 7:52 PM EDT (23:52 UTC)
Expired: Apr 22, 2014, 8:30 PM EDT
In force: 38 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

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

The radar

The Philadelphia radar (KDIX), 66 km from the middle of the area, began a volume at 23:53 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 22, 7:53 PM EDT	TSTM WND DMG	Philadelphia, PA	TREES DOWN IN WEST PHILADELPHIA
Apr 22, 7:55 PM EDT	TSTM WND DMG	Roxborough, PA	TREES DOWN IN ROXBOROUGH PART OF PHILADELPHIA

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

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 11.9 hours before the alert went out and 91 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: 1670 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 120 m²/s²
0-3 km storm-relative helicity: 151 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.

087 
WUUS51 KPHI 222352
SVRPHI
NJC001-005-007-015-PAC017-045-091-101-230030-
/O.NEW.KPHI.SV.W.0010.140422T2352Z-140423T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
752 PM EDT TUE APR 22 2014

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CAMDEN COUNTY IN SOUTHERN NEW JERSEY...
  SOUTHEASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
  PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  EASTERN DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  GLOUCESTER COUNTY IN SOUTHERN NEW JERSEY...
  WEST CENTRAL BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...
  NORTHWESTERN ATLANTIC COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 830 PM EDT

* AT 748 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
LINE OF SEVERE THUNDERSTORMS...MOVING EAST AT 35 MPH. THESE STORMS  
ARE CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60 MPH IN 
ADDITION TO SMALL HAIL. 

* SEVERE THUNDERSTORMS WILL AFFECT THE FOLLOWING LOCATIONS AMONG 
OTHERS...AMBLER...PHILADELPHIA...CINNAMINSON...CAMDEN...NATIONAL PARK

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS LINE OF SEVERE THUNDERSTORMS HAS A HISTORY OF PRODUCING WIND 
DAMAGE.

THIS SEVERE THUNDERSTORM MAY CONTAIN LITTLE OR NO LIGHTNING. DO NOT
WAIT TO HEAR THUNDER BEFORE TAKING COVER. SEEK SHELTER IMMEDIATELY
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 3958 7479 3967 7525 3973 7538 3976 7540
      3998 7535 4005 7539 4007 7536 4007 7540
      4022 7548 4017 7488 3984 7474
TIME...MOT...LOC 2349Z 286DEG 32KT 4020 7539 3996 7527
          3970 7531

$$

ROBERTSON

1 follow-up statement

566 
WWUS51 KPHI 230015
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
815 PM EDT TUE APR 22 2014

PAC045-230023-
/O.CAN.KPHI.SV.W.0010.000000T0000Z-140423T0030Z/
DELAWARE PA-
815 PM EDT TUE APR 22 2014

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN DELAWARE COUNTY IS
CANCELLED...

THE STORM THAT PROMPTED THE SEVERE THUNDERSTORM WARNING HAS MOVED OUT
OF THE AREA...THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN
CANCELLED.

LAT...LON 3958 7479 3965 7517 3993 7512 4020 7526
      4017 7488 3984 7474
TIME...MOT...LOC 0013Z 286DEG 32KT 4014 7512 3990 7500
          3964 7504

$$

NJC001-005-007-015-PAC017-091-101-230030-
/O.CON.KPHI.SV.W.0010.000000T0000Z-140423T0030Z/
CAMDEN NJ-BUCKS PA-MONTGOMERY PA-PHILADELPHIA PA-GLOUCESTER NJ-
BURLINGTON NJ-ATLANTIC NJ-
815 PM EDT TUE APR 22 2014

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 830 PM EDT
FOR NORTHWESTERN ATLANTIC...WEST CENTRAL BURLINGTON...EASTERN
GLOUCESTER...NORTHEASTERN PHILADELPHIA...SOUTHEASTERN MONTGOMERY...
SOUTHEASTERN BUCKS AND CAMDEN COUNTIES...

AT 812 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH. ALONG A LINE EXTENDING FROM EAST CENTRAL
MONTGOMERY COUNTY TO NORTH CENTRAL CAMDEN COUNTY TO CENTRAL
GLOUCESTER COUNTY...MOVING EAST AT 35 MPH.

* SEVERE THUNDERSTORMS WILL AFFECT THE FOLLOWING LOCATIONS AMONG 
OTHERS...NORTH PHILADELPHIA...CINNAMINSON...CAMDEN...WILLINGBORO.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS LINE OF SEVERE THUNDERSTORMS HAS A HISTORY OF PRODUCING WIND 
DAMAGE.

THIS SEVERE THUNDERSTORM MAY CONTAIN LITTLE OR NO LIGHTNING. DO NOT 
WAIT TO HEAR THUNDER BEFORE TAKING COVER. 

LAT...LON 3958 7479 3965 7517 3993 7512 4020 7526
      4017 7488 3984 7474
TIME...MOT...LOC 0013Z 286DEG 32KT 4014 7512 3990 7500
          3964 7504

$$

ROBERTSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 22, 3:23 PM EDT	Fire Weather Watch	PHI	Berks, Bucks, Carbon, Chester, Delaware, Lehigh and 4 more	13 hr
Apr 22, 5:55 PM EDT	Special Weather Statement	PHI	Berks, Lehigh	65 min
Apr 22, 6:41 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Montgomery	49 min
Apr 22, 6:54 PM EDT	Special Weather Statement	PHI	Berks, Lehigh, Northampton	51 min
Apr 22, 7:21 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Chester, Delaware, Montgomery, Philadelphia	39 min
Apr 22, 3:34 AM EDT	Gale Watch	PHI		12 hr
Apr 22, 3:34 AM EDT	Small Craft Advisory	PHI		30 hr
Apr 22, 3:38 PM EDT	Gale Warning	PHI		44 hr
Apr 22, 7:45 PM EDT	Special Weather Statement	PHI	Cumberland, Gloucester, Salem	60 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2014 Severe Thunderstorm Warnings in New Jersey, 2014 Every severe thunderstorm warning in 2014

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.