Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1994

Severe Thunderstorm Warning 72, NWS Pittsburgh, PA

June 21, 1994Allegheny County, Washington County, Pennsylvania

NWS Pittsburgh, PA issued this severe thunderstorm warning at Jun 21, 1994, 2:57 PM EDT for Allegheny County, Washington County, Pennsylvania. It was in force for 63 min.

The area

The counties it named.

The facts

Issued
Jun 21, 1994, 2:57 PM EDT (18:57 UTC)
Expired
Jun 21, 1994, 4:00 PM EDT
In force
63 min
Issued by
NWS Pittsburgh, PA
Area
Whole counties

Counties Allegheny County, PA, Washington County, PA

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 12:00Z, 7.0 hours before the alert went out and 9 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, Pittsburgh, PA at 12:00Z on 1994-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 262 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, Pittsburgh, PA at 12:00Z on 1994-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 105 square meters per square second.1939Sfc1 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
262 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
639 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
105 m²/s²
0-3 km storm-relative helicity
145 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

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
Jun 20, 8:20 PM EDTSevere Thunderstorm WarningPBZAllegheny, Beaver, Washington55 min
Jun 20, 9:10 PM EDTSevere Thunderstorm WarningPBZAllegheny, Washington80 min
Jun 20, 9:10 PM EDTSevere Thunderstorm WarningPBZButler80 min
Jun 20, 9:38 PM EDTSevere Thunderstorm WarningPBZArmstrong, Indiana, Westmoreland82 min
Jun 20, 10:24 PM EDTSevere Thunderstorm WarningPBZClarion, Jefferson66 min
Jun 20, 10:24 PM EDTSevere Thunderstorm WarningPBZGreene66 min
Jun 21, 2:35 PM EDTSevere Thunderstorm WarningPBZBeaver55 min
Jun 21, 4:26 PM EDTSevere Thunderstorm WarningPBZGreene49 min
Jun 20, 8:20 PM EDTSevere Thunderstorm WarningPBZBrooke, Hancock55 min
Jun 21, 2:35 PM EDTSevere Thunderstorm WarningPBZBrooke, Hancock55 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.