Alert archive / Pennsylvania / Flash Flood Warnings in 1990

Flash Flood Warning 117, NWS Pittsburgh, PA

December 30, 1990Beaver County, Butler County, Pennsylvania; Hancock County, West Virginia

NWS Pittsburgh, PA issued this flash flood warning at Dec 30, 1990, 9:04 AM EST for Beaver County, Butler County, Pennsylvania; Hancock County, West Virginia. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Dec 30, 1990, 9:04 AM EST (14:04 UTC)
Expired
Dec 30, 1990, 1:00 PM EST
In force
4 hr
Issued by
NWS Pittsburgh, PA
Area
Whole counties

Counties Beaver County, PA, Butler County, PA, Hancock 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

Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 2.1 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, Buffalo Intl Airport, NY at 12:00Z on 1990-12-30Temperature 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 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Buffalo Intl Airport, NY at 12:00Z on 1990-12-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 601 square meters per square second.1939587897Sfc1 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
536 m above ground
0-6 km bulk shear
88 kt
0-1 km storm-relative helicity
601 m²/s²
0-3 km storm-relative helicity
765 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
Dec 30, 8:46 AM ESTFlash Flood WarningPBZAllegheny4 hr
Dec 30, 8:46 AM ESTFlash Flood WarningPBZClarion4 hr
Dec 30, 9:04 AM ESTFlash Flood WarningPBZArmstrong4 hr
Dec 30, 10:41 AM ESTFlash Flood WarningPBZWestmoreland5 hr
Dec 30, 12:30 PM ESTFlash Flood WarningPBZAllegheny, Armstrong, Butler, Clarion, Westmoreland5 hr
Dec 30, 12:30 PM ESTFlash Flood WarningPBZBeaver5 hr
Dec 30, 12:55 PM ESTFlash Flood WarningPBZButler4 hr
Dec 30, 4:30 PM ESTFlash Flood WarningPBZAllegheny, Armstrong, Butler, Westmoreland6 hr
Dec 30, 4:30 PM ESTFlash Flood WarningPBZBeaver6 hr
Dec 30, 4:30 PM ESTFlash Flood WarningPBZClarion6 hr
Dec 30, 12:30 PM ESTFlash Flood WarningPBZBrooke, Hancock5 hr

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.