Alert archive / Pennsylvania / Flash Flood Warnings in 1990

Flash Flood Warning 59, NWS Pittsburgh, PA

July 12, 1990Beaver County, Pennsylvania

NWS Pittsburgh, PA issued this flash flood warning at Jul 12, 1990, 11:59 PM EDT for Beaver County, Pennsylvania. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Jul 12, 1990, 11:59 PM EDT (03:59 UTC)
Expired
Jul 13, 1990, 4:00 AM EDT
In force
4 hr
Issued by
NWS Pittsburgh, PA
Area
Whole counties

County Beaver 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 00:00Z, 4.0 hours before the alert went out and 37 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 1990-07-13Temperature 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 00:00Z on 1990-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 54 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
573 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
54 m²/s²
0-3 km storm-relative helicity
49 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 130358 RRA
FFWPIT
PAC007-130800-
FLOOD STATEMENT FOR STREAMS AND CREEKS
NATIONAL WEATHER SERVICE PITTSBURGH PA
1159 PM EDT THU JUL 12 1990

THE FLOOD WARNING FOR STREAMS AND CREEKS HAS BEEN EXTENDED UNTIL
4 AM EDT FOR THE FOLLOWING COUNTY IN WESTERN PENNSYLVANIA..

...BEAVER COUNTY.

A FLOOD WARNING FOR STREAMS AND CREEKS MEANS FLOODING IS IMMINENT OR
IN PROGRESS.  EVACUATIONS ARE CONTINUING IN BEAVER COUNTY ALONG THE
CONNOQUENESSING AND BRUSH CREEKS.

WIDESPREAD FLOODING OF BASEMENTS AND STREETS HAS OCCURRED ACROSS
WESTERN PENNSYLVANIA AND THE NORTHERN WEST VIRGINIA PANHANDLE THURSDAY.

MAINLY LIGHT RAIN IS FALLING ACROSS WESTERN PENNSYLVANIA AND THE
NORTHERN WEST VIRGINIA PANHANDLE.  HOWEVER...FLOODING MAY CONTINUE
UNTIL 4 AM IN BEAVER COUNTY AS RUNOFF CONTINUES INTO THE STREAMS
AND CREEKS.   

IF YOU GET ANY INDICATION THAT FLOOD WATERS ARE APPROACHING..MOVE TO
HIGHER GROUND IMMEDIATELY. DO NOT DRIVE THROUGH FLOODED AREAS. FLOODING
IS QUITE SERIOUS IN SOME OF THESE COUNTIES UNDER A FLOOD WARNING.

STEWART/DAVIS

The office that day

Everything else NWS Pittsburgh, PA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 12, 8:00 PM EDTFlash Flood WarningPBZBeaver, Butler, Westmoreland4 hr
Jul 12, 8:00 PM EDTFlash Flood WarningPBZJefferson4 hr
Jul 12, 8:00 PM EDTFlash Flood WarningPBZWashington4 hr
Jul 13, 4:00 AM EDTFlash Flood WarningPBZBeaver6 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.