Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 16, NWS Pittsburgh, PA

April 30, 1994Westmoreland County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Apr 30, 1994, 9:55 PM EDT for Westmoreland County, Pennsylvania. It was in force for 35 min.

The area

The counties it named.

The facts

Issued
Apr 30, 1994, 9:55 PM EDT (01:55 UTC)
Expired
Apr 30, 1994, 10:30 PM EDT
In force
35 min
Issued by
NWS Pittsburgh, PA
Area
Whole counties

County Westmoreland County, PA

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 1.9 hours before the alert went out and 233 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 1994-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1201 joules per kilogram.LCLLFCEL10008507005003002001001 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 1994-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 180 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
1201 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
809 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
180 m²/s²
0-3 km storm-relative helicity
258 m²/s²
Significant tornado parameter
0.9
Supercell composite
4.3

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

The office that day

Everything else NWS Pittsburgh, PA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 30, 9:50 PM EDTSevere Thunderstorm WarningPBZArmstrong, Indiana55 min
Apr 30, 10:27 PM EDTSevere Thunderstorm WarningPBZJefferson48 min
Apr 30, 10:42 PM EDTSevere Thunderstorm WarningPBZClearfield63 min
May 1, 12:23 AM EDTSevere Thunderstorm WarningPBZButler52 min
May 1, 12:40 AM EDTSevere Thunderstorm WarningPBZAllegheny50 min
May 1, 12:47 AM EDTSevere Thunderstorm WarningPBZArmstrong, Westmoreland73 min
May 1, 12:47 AM EDTSevere Thunderstorm WarningPBZClarion73 min
May 1, 1:22 AM EDTSevere Thunderstorm WarningPBZIndiana, Jefferson53 min
May 1, 2:00 AM EDTSevere Thunderstorm WarningPBZCambria, Clearfield45 min

Nearby

Severe Thunderstorm Warnings in Pennsylvania, 1994Every severe thunderstorm warning in 1994

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.