Alert archive / Pennsylvania / Tornado Warnings in 1991

Tornado Warning 4, NWS Pittsburgh, PA

July 7, 1991Greene County, Washington County, Pennsylvania; Marshall County, West Virginia

NWS Pittsburgh, PA issued this tornado warning at Jul 7, 1991, 5:04 PM EDT for Greene County, Washington County, Pennsylvania; Marshall County, West Virginia. It was in force for 56 min.

The area

The counties it named.

The facts

Issued
Jul 7, 1991, 5:04 PM EDT (21:04 UTC)
Expired
Jul 7, 1991, 6:00 PM EDT
In force
56 min
Issued by
NWS Pittsburgh, PA
Area
Whole counties

Counties Greene County, PA, Washington County, PA, Marshall County, WV

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.1 hours before the alert went out and 280 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 12:00Z on 1991-07-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1279 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 12:00Z on 1991-07-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 93 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
1279 J/kg
Mixed-layer CIN
-100 J/kg
Mixed-layer LCL
1270 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
93 m²/s²
0-3 km storm-relative helicity
46 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Jul 7, 11:12 AM EDTSevere Thunderstorm WarningPBZIndiana63 min
Jul 7, 11:21 AM EDTSevere Thunderstorm WarningPBZBlair, Cambria69 min
Jul 7, 4:37 PM EDTSevere Thunderstorm WarningPBZWashington68 min
Jul 7, 4:37 PM EDTSevere Thunderstorm WarningPBZGreene68 min
Jul 7, 6:28 PM EDTSevere Thunderstorm WarningPBZBeaver62 min
Jul 7, 7:09 PM EDTSevere Thunderstorm WarningPBZWashington66 min
Jul 7, 7:19 PM EDTSevere Thunderstorm WarningPBZFayette, Somerset56 min
Jul 7, 5:04 PM EDTTornado WarningPBZOhio56 min

Nearby

Tornado Warnings in Pennsylvania, 1991Tornado Warnings in West Virginia, 1991Every tornado warning in 1991Tornadoes in 1991

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.