Alert archive / Pennsylvania / Flash Flood Warnings in 1990

Flash Flood Warning 102, NWS Pittsburgh, PA

September 7, 1990Washington County, Pennsylvania

NWS Pittsburgh, PA issued this flash flood warning at Sep 7, 1990, 1:50 PM EDT for Washington County, Pennsylvania. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Sep 7, 1990, 1:50 PM EDT (17:50 UTC)
Expired
Sep 7, 1990, 5:00 PM EDT
In force
3 hr
Issued by
NWS Pittsburgh, PA
Area
Whole counties

County Washington County, PA

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 12:00Z, 5.8 hours before the alert went out and 28 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 1990-09-07Temperature 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, Pittsburgh, PA at 12:00Z on 1990-09-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 147 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
NaN m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
147 m²/s²
0-3 km storm-relative helicity
159 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
Sep 6, 9:42 PM EDTSevere Thunderstorm WarningPBZBeaver, Washington78 min
Sep 6, 9:42 PM EDTSevere Thunderstorm WarningPBZGreene78 min
Sep 6, 9:42 PM EDTSevere Thunderstorm WarningPBZArmstrong, Clarion, Jefferson78 min
Sep 6, 9:42 PM EDTSevere Thunderstorm WarningPBZAllegheny, Butler78 min
Sep 6, 11:00 PM EDTSevere Thunderstorm WarningPBZAllegheny, Fayette, Washington, Westmoreland60 min
Sep 7, 12:06 AM EDTFlash Flood WarningPBZWashington4 hr
Sep 7, 12:06 AM EDTFlash Flood WarningPBZAllegheny, Westmoreland4 hr
Sep 7, 4:00 AM EDTFlash Flood WarningPBZWashington4 hr
Sep 7, 7:30 AM EDTFlash Flood WarningPBZWashington3 hr
Sep 7, 9:45 AM EDTFlash Flood WarningPBZWashington4 hr

Nearby

Flash Flood Warnings in Pennsylvania, 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.