Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 247, NWS Philadelphia/Mount Holly

August 14, 2008Monroe County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Aug 14, 2008, 2:37 PM EDT for Monroe County, Pennsylvania. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 14, 2008, 2:37 PM EDT (18:37 UTC)
Expired: Aug 14, 2008, 3:15 PM EDT
In force: 38 min
Issued by: NWS Philadelphia/Mount Holly
Area: Storm-based polygon

County Monroe County, PA

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 6.6 hours before the alert went out and 198 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: 374 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 966 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 49 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

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

000 
WUUS51 KPHI 141837
SVRPHI
PAC089-141930-
/O.NEW.KPHI.SV.W.0247.080814T1837Z-080814T1930Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
237 PM EDT THU AUG 14 2008

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL MONROE COUNTY IN NORTHEAST PENNSYLVANIA...

* UNTIL 330 PM EDT

* AT 233 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL.  THIS
  STORM WAS LOCATED NEAR REEDERS...OR ABOUT NEAR MOUNT POCONO...AND
  MOVING NORTHEAST AT 21 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  SCOTRUN AND 9 MILES NORTHWEST OF STORMVILLE BY 240 PM...
  HERNYVILLE...PARADISE VALLEY...ANALOMINK AND 8 MILES NORTHWEST OF
  EAST STROUDSBURG BY 255 PM...
  ALPINE MOUNTAIN BY 300 PM...
  7 MILES NORTHWEST OF ECHO LAKE BY 320 PM...

THUNDERSTORMS ARE CAPABLE OF PRODUCING HEAVY RAINFALL WHICH MAY
RESULT IN LOCALIZED AREAS OF FLOODING. DO NOT DRIVE IN AREAS WHERE 
WATER IS CROSSING THE ROAD. CLOUD TO GROUND LIGHTNING IS ALSO 
OCCURRING WITH THIS STORM.

LAT...LON 4121 7513 4120 7515 4116 7515 4115 7509
      4106 7502 4093 7528 4093 7545 4107 7554
      4122 7514
TIME...MOT...LOC 1836Z 243DEG 18KT 4106 7536

$$

GORSE

1 follow-up statement

000 
WWUS51 KPHI 141915
SVSPHI

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
315 PM EDT THU AUG 14 2008

PAC089-141923-
/O.CAN.KPHI.SV.W.0247.000000T0000Z-080814T1930Z/
MONROE PA-
315 PM EDT THU AUG 14 2008

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MONROE COUNTY IS
CANCELLED...

THE THUNDERSTORM THAT PROMPTED THE WARNING TO BE ISSUED HAS WEAKENED.
THEREFORE THE SEVERE THUNDERSTORM WARNING HAS BEEN CANCELLED. 
HOWEVER, ADDITIONAL SHOWERS AND THUNDERSTORMS CONTINUE ACROSS THE 
AREA PRODUCING LOCALLY HEAVY RAIN, SMALL HAIL AND CLOUD TO GROUND 
LIGHTNING.

LAT...LON 4121 7513 4120 7515 4116 7515 4115 7509
      4106 7502 4093 7528 4093 7545 4107 7554
      4122 7514
TIME...MOT...LOC 1913Z 243DEG 18KT 4114 7514

$$

GORSE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 13, 9:26 PM EDT	Severe Thunderstorm Warning	PHI	Berks, Lehigh	64 min
Aug 13, 10:24 PM EDT	Severe Thunderstorm Warning	PHI	Carbon, Lehigh, Monroe, Northampton	36 min
Aug 14, 2:43 PM EDT	Severe Thunderstorm Warning	PHI	Lehigh	34 min
Aug 14, 3:50 PM EDT	Areal Flood Advisory	PHI	Berks, Carbon, Lehigh, Monroe, Northampton	3 hr
Aug 14, 4:29 PM EDT	Flash Flood Warning	PHI	Berks	4 hr

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2008 Every severe thunderstorm warning in 2008

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.