Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1995

Severe Thunderstorm Warning 11, NWS Philadelphia/Mount Holly

April 9, 1995Delaware County, Philadelphia County, Pennsylvania

NWS Philadelphia/Mount Holly issued this severe thunderstorm warning at Apr 9, 1995, 8:31 PM EDT for Delaware County, Philadelphia County, Pennsylvania. It was in force for 44 min.

The area

The counties it named.

The facts

Issued
Apr 9, 1995, 8:31 PM EDT (00:31 UTC)
Expired
Apr 9, 1995, 9:15 PM EDT
In force
44 min
Issued by
NWS Philadelphia/Mount Holly
Area
Whole counties

Counties Delaware County, PA, Philadelphia County, PA

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 0.5 hours before the alert went out and 215 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, Washington/Dulle, VA at 00:00Z on 1995-04-10Temperature 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, Washington/Dulle, VA at 00:00Z on 1995-04-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 163 square meters per square second.19395878Sfc1 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
2945 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
163 m²/s²
0-3 km storm-relative helicity
288 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.

000 
TTAA00 KPHL 100032 RRA
SVRPHL
DEC003-PAC045-101-100115-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHILADELPHIA/MOUNT HOLLY NJ
831 PM EDT SUN APR 9 1995
 
THE NATIONAL WEATHER SERVICE IN PHILADELPHIA/MOUNT HOLLY HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  915 PM EDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN  DELAWARE
 
   ...NEW CASTLE COUNTY
 
IN  PENNSYLVANIA
 
   ...DELAWARE COUNTY...PHILADELPHIA COUNTY
 
AT 8:25 PM...WEATHER RADAR FROM MT. HOLLY NEW JERSEY INDICATED A LINE OF
THUNDERSTORMS EXTENDING FROM CECIL COUNTY MARYLAND NORTHWARD ACROSS
CHESTER...MONTGOMERY AND BUCKS COUNTIES IN SOUTHEAST PENNSYLVANIA. THESE
STORMS ARE MOVING EAST AT AROUND 45 MPH AND HAVE A HISTORY OF STRONG AND
DAMAGING WINDS. AT 8:20 PM...A WEATHER SPOTTER IN SOUDERTON IN
MONTGOMERY COUNTY REPORTED A WIND GUST TO 52 MPH.
 
THESE ARE DANGEROUS STORMS.  IF YOU ARE IN THE WARNED AREA...PREPARE
FOR STRONG DAMAGJING WINDS...HAIL...VERY HEAVY RAIN AND DEADLY
LIGHTNING.  SHOULD THE STORM APPROACH YOU...SEEK IMMEDIATE SHELTER
INDOORS...BUT DO NOT STAND NEAR WINDOWS.  MOBILE HOMES ARE MOST
VULNERABLE TO HIGH WINDS AND SHOULD BE AVOIDED.
 
 
 
&

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 9, 8:02 PM EDTSevere Thunderstorm WarningPHIChester43 min
Apr 9, 8:16 PM EDTSevere Thunderstorm WarningPHIBucks, Montgomery44 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1995Every severe thunderstorm warning in 1995

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.