Alert archive / Pennsylvania / Flash Flood Warnings in 1990

Flash Flood Warning 101, NWS Pittsburgh, PA

September 7, 1990Washington County, Pennsylvania; Brooke County, West Virginia

NWS Pittsburgh, PA issued this flash flood warning at Sep 7, 1990, 9:45 AM EDT for Washington County, Pennsylvania; Brooke County, West Virginia. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Sep 7, 1990, 9:45 AM EDT (13:45 UTC)
Expired
Sep 7, 1990, 2:00 PM EDT
In force
4 hr
Issued by
NWS Pittsburgh, PA
Area
Whole counties

Counties Washington County, PA, Brooke 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 12:00Z, 1.8 hours before the alert went out and 33 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

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KPIT 071347
FFWPIT
PAC125-WVC009-071800-

BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PITTSBURGH PA
945 AM EDT FRI SEP 7 1990

THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS EXTENDED THE
FLASH FLOOD WARNING EFFECTIVE UNTIL 200 PM EDT
FOR THE FOLLOWING LOCATIONS...

IN WEST PENNSYLVANIA

   ...WASHINGTON COUNTY


IN THE WEST VIRGINIA PANHANDLE

   ...BROOKE COUNTY

FLOODING CONTINUES IN BROOKE COUNTY WEST VIRGINIA AND WASHINGTON COUNTY
PENNSYLVANIA.

NUMEROUS REPORTS OF FLOODING CONTINUE IN FOLLANSBEE WEST VIRGINIA...AS
WELL AS IN AVELLA AND BROWNSTOWN PENNSYLVANIA.

MAIN STREET IN FOLLANSBEE IS STILL COVERED WITH WATER...WHILE
PEOPLE REMAIN EVACUATED ALONG CROSS CREEK IN THE AVELLA PENNSYLVANIA
AREA.

RAIN WILL CONTINUE FOR THE NEXT SEVERAL HOURS IN THESE AREAS.  THE RAIN
MAY BE HEAVY AT TIMES ALSO.

STAY AWAY FROM FLOODED AREAS!

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY.  THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO
CROSS SAFELY.  VEHICLES CAUGHT IN RISING WATER SHOULD BE
ABANDONED QUICKLY.  MOVE TO HIGHER GROUND.

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, 1:50 PM EDTFlash Flood WarningPBZWashington3 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.