Alert archive / Pennsylvania / Flash Flood Warnings in 1990

Flash Flood Warning 77, NWS Pittsburgh, PA

July 15, 1990Westmoreland County, Pennsylvania

NWS Pittsburgh, PA issued this flash flood warning at Jul 15, 1990, 3:15 PM EDT for Westmoreland County, Pennsylvania. It was in force for 75 min.

The area

The counties it named.

The facts

Issued
Jul 15, 1990, 3:15 PM EDT (19:15 UTC)
Expired
Jul 15, 1990, 4:30 PM EDT
In force
75 min
Issued by
NWS Pittsburgh, PA
Area
Whole counties

County Westmoreland 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, 7.3 hours before the alert went out and 55 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 1990-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 31 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 1990-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -39 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
31 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
687 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
-39 m²/s²
0-3 km storm-relative helicity
11 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

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 14, 11:13 PM EDTFlash Flood WarningPBZBeaver, Washington5 hr
Jul 14, 11:13 PM EDTFlash Flood WarningPBZGreene5 hr
Jul 15, 2:45 AM EDTFlash Flood WarningPBZBeaver, Washington5 hr
Jul 15, 2:45 AM EDTFlash Flood WarningPBZGreene5 hr
Jul 15, 4:43 AM EDTFlash Flood WarningPBZAllegheny, Butler3 hr
Jul 15, 7:08 AM EDTFlash Flood WarningPBZButler3 hr
Jul 15, 12:36 PM EDTFlash Flood WarningPBZFayette2 hr
Jul 15, 1:00 PM EDTFlash Flood WarningPBZWestmoreland2 hr
Jul 15, 2:30 PM EDTFlash Flood WarningPBZSomerset2 hr
Jul 15, 2:30 PM EDTFlash Flood WarningPBZIndiana2 hr
Jul 15, 2:52 PM EDTFlash Flood WarningPBZBeaver, Butler2 hr
Jul 15, 3:50 PM EDTFlash Flood WarningPBZBedford, Cambria2 hr
Jul 15, 4:17 PM EDTFlash Flood WarningPBZBlair, Clearfield3 hr
Jul 15, 4:53 PM EDTFlash Flood WarningPBZBeaver3 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.