Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 7, NWS Philadelphia/Mount Holly

April 15, 20144 counties in Pennsylvania; Burlington County, Camden County, Mercer County, New Jersey

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 15, 2014, 3:56 PM EDT for 4 counties in Pennsylvania; Burlington County, Camden County, Mercer County, New Jersey. It was in force for 34 min. 1 report 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, 2014, 3:56 PM EDT (19:56 UTC)
Expired: Apr 15, 2014, 4:30 PM EDT
In force: 34 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

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

The radar

The Philadelphia radar (KDIX), 58 km from the middle of the area, began a volume at 19:57 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	TSTM WND DMG	Philadelphia, PA	TREE DOWN IN NORTHEAST 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, 7.9 hours before the alert went out and 103 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: 109 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 669 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 246 m²/s²
0-3 km storm-relative helicity: 242 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

213 
WUUS51 KPHI 151956
SVRPHI
NJC005-007-021-PAC017-045-091-101-152030-
/O.NEW.KPHI.SV.W.0007.140415T1956Z-140415T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
356 PM EDT TUE APR 15 2014

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...
  SOUTHEASTERN BUCKS COUNTY IN SOUTHEAST PENNSYLVANIA...
  SOUTHEASTERN MONTGOMERY COUNTY IN SOUTHEAST PENNSYLVANIA...
  PHILADELPHIA COUNTY IN SOUTHEAST PENNSYLVANIA...
  NORTHEASTERN DELAWARE COUNTY IN SOUTHEAST PENNSYLVANIA...
  NORTHWESTERN BURLINGTON COUNTY IN SOUTHERN NEW JERSEY...

* UNTIL 430 PM EDT

* AT 346 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM. THE STORM WAS NEAR YEADON...MOVING NORTHEAST
  AT 40 MPH. THIS STORM IS CAPABLE OF PRODUCING DAMAGING WINDS IN
  EXCESS OF 60 MPH. 

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  PHILADELPHIA AROUND 400 PM EDT...
  WISSINOMING AND TACONY AROUND 405 PM EDT...
  NORTHEAST PHILADELPHIA AND ANDALUSIA AROUND 410 PM EDT...
  BENSALEM AND FEASTERVILLE AROUND 415 PM EDT...
  LANGHORN AND BRISTOL AROUND 420 PM EDT...
  LEVITTOWN AND WOODSIDE AROUND 425 PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 3988 7513 3988 7519 3986 7521 3986 7524
      3998 7537 4037 7484 4012 7459
TIME...MOT...LOC 1952Z 231DEG 36KT 3997 7519

$$

FORECASTER:
KLINE

1 follow-up statement

349 
WWUS51 KPHI 152020
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
420 PM EDT TUE APR 15 2014

NJC005-007-021-PAC017-045-091-101-152028-
/O.CAN.KPHI.SV.W.0007.000000T0000Z-140415T2030Z/
CAMDEN NJ-MERCER NJ-BUCKS PA-MONTGOMERY PA-PHILADELPHIA PA-
DELAWARE PA-BURLINGTON NJ-
420 PM EDT TUE APR 15 2014

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BURLINGTON...
NORTHEASTERN DELAWARE...PHILADELPHIA...SOUTHEASTERN MONTGOMERY...
SOUTHEASTERN BUCKS...SOUTHWESTERN MERCER AND NORTHWESTERN CAMDEN
COUNTIES IS CANCELLED...

THE STORM HAS WEAKENED TO BELOW SEVERE LIMITS...THEREFORE THE SEVERE
THUNDERSTORM WARNING HAS BEEN CANCELLED.

LAT...LON 3988 7513 3988 7519 3986 7521 3986 7524
      3998 7537 4037 7484 4012 7459
TIME...MOT...LOC 2018Z 231DEG 36KT 4013 7492

$$

IOVINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 15, 3:40 AM EDT	Freeze Warning	PHI	Berks, Bucks, Chester, Delaware, Montgomery, Philadelphia	29 hr
Apr 15, 12:30 PM EDT	Special Weather Statement	PHI	Bucks, Montgomery	30 min
Apr 15, 12:44 PM EDT	Areal Flood Advisory	PHI	Bucks, Chester, Delaware, Montgomery	4 hr
Apr 15, 2:56 PM EDT	Areal Flood Advisory	PHI	Chester	4 hr
Apr 15, 3:20 PM EDT	Special Weather Statement	PHI	Bucks, Delaware, Montgomery, Philadelphia	40 min
Apr 15, 3:32 PM EDT	Freeze Watch	PHI	Berks, Bucks, Chester, Delaware, Montgomery	24 hr
Apr 15, 3:36 PM EDT	Special Weather Statement	PHI	Bucks	39 min
Apr 15, 5:20 PM EDT	River Flood Warning	PHI	Chester	7 hr
Apr 15, 4:05 AM EDT	Gale Warning	PHI		30 hr
Apr 15, 12:58 PM EDT	Areal Flood Advisory	PHI	Hunterdon, Morris, Somerset, Sussex, Warren	4 hr
Apr 15, 2:46 PM EDT	Special Weather Statement	PHI	Hunterdon	44 min
Apr 15, 4:11 PM EDT	Special Weather Statement	PHI	Somerset	34 min
Apr 15, 4:23 PM EDT	Special Weather Statement	PHI	Mercer, Middlesex	37 min
Apr 15, 7:54 PM EDT	Areal Flood Warning	PHI	Somerset	6 hr

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.