Alert archive / Pennsylvania / Flash Flood Warnings in 1990

Flash Flood Warning 93, NWS Pittsburgh, PA

August 19, 1990Greene County, Pennsylvania; Marshall County, West Virginia

NWS Pittsburgh, PA issued this flash flood warning at Aug 19, 1990, 5:26 AM EDT for Greene County, Pennsylvania; Marshall County, West Virginia. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Aug 19, 1990, 5:26 AM EDT (09:26 UTC)
Expired
Aug 19, 1990, 8:00 AM EDT
In force
3 hr
Issued by
NWS Pittsburgh, PA
Area
Whole counties

Counties Greene County, PA, Marshall County, WV

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Pittsburgh, PA (KPIT), launched 00:00Z, 9.4 hours before the alert went out and 68 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 00:00Z on 1990-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 339 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 00:00Z on 1990-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 48 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
339 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
674 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
48 m²/s²
0-3 km storm-relative helicity
58 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
Aug 19, 5:59 PM EDTSevere Thunderstorm WarningPBZGreene61 min
Aug 19, 6:40 PM EDTFlash Flood WarningPBZAllegheny3 hr
Aug 19, 6:54 PM EDTSevere Thunderstorm WarningPBZBeaver66 min
Aug 19, 6:54 PM EDTSevere Thunderstorm WarningPBZAllegheny3 hr
Aug 19, 7:40 PM EDTSevere Thunderstorm WarningPBZCambria80 min
Aug 19, 5:59 PM EDTSevere Thunderstorm WarningPBZMarshall, Ohio61 min

Nearby

Flash Flood Warnings in Pennsylvania, 1990Flash Flood Warnings in West Virginia, 1990Every flash flood warning in 1990

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.