Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 84, NWS Philadelphia/Mount Holly

June 14, 2004Chester County, Pennsylvania; Cecil County, Maryland

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Jun 14, 2004, 7:46 PM EDT for Chester County, Pennsylvania; Cecil County, Maryland. It was in force for 74 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
Jun 14, 2004, 7:46 PM EDT (23:46 UTC)
Expired
Jun 14, 2004, 9:00 PM EDT
In force
74 min
Issued by
NWS Philadelphia/Mount Holly
Area
Counties, with a storm outline in the text

Counties Cecil County, MD, Chester County, PA

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 11.8 hours before the alert went out and 26 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-pSkew-T log-p diagram, Phillips Aaf/Abe, MD at 12:00Z on 2004-06-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phillips Aaf/Abe, MD at 12:00Z on 2004-06-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 277 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
750 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
277 m²/s²
0-3 km storm-relative helicity
272 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.

501 
WUUS51 KPHI 142346
SVRPHI
MDC015-PAC029-150100-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
740 PM EDT MON JUN 14 2004

THE NATIONAL WEATHER SERVICE IN MOUNT HOLLY NJ HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN CECIL COUNTY IN NORTHEAST MARYLAND
  SOUTHWESTERN CHESTER COUNTY IN SOUTHEAST PENNSYLVANIA

* UNTIL 900 PM EDT

* AT 736 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM.  THIS STORM WAS LOCATED 11 MILES WEST OF
  RISING SUN...OR ABOUT 25 MILES SOUTH OF LANCASTER...AND MOVING EAST
  AT 15 MPH. THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WINDS AND
  NUMEROUS CLOUD TO GROUND LIGHTNING STRIKES. VERY HEAVY RAIN MAY ALSO
  ACCOMPANY THE STORM.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  RISING SUN BY 810 PM EDT
  OXFORD BY 825 PM EDT
  8 MILES NORTH OF NORTH EAST BY 830 PM EDT
  8 MILES NORTH OF ELKTON BY 850 PM EDT

LAT...LON 3978 7626 3958 7626 3959 7580 3978 7580

$$

RPW/RNS

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 2004Severe Thunderstorm Warnings in Maryland, 2004Every severe thunderstorm warning in 2004

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.