Alert archive / Pennsylvania / Flash Flood Warnings in 1990
Flash Flood Warning 17, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Jun 28, 1990, 5:45 PM EDT for Allegheny County, Washington County, Westmoreland County, Pennsylvania. It was in force for 2 hr.
The area
The counties it named.
The facts
- Issued
- Jun 28, 1990, 5:45 PM EDT (21:45 UTC)
- Expired
- Jun 28, 1990, 8:00 PM EDT
- In force
- 2 hr
- Issued by
- NWS Pittsburgh, PA
- Area
- Whole counties
Counties Allegheny County, PA, Washington County, PA, 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, 9.8 hours before the alert went out and 20 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.
- Mixed-layer CAPE
- 165 J/kg
- Mixed-layer CIN
- -48 J/kg
- Mixed-layer LCL
- 1222 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 84 m²/s²
- 0-3 km storm-relative helicity
- 106 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPIT 282149 FFWPIT PAC003-125-129-WVC009-290000- BULLETIN - IMMEDIATE BROADCAST REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE PITTSBURGH PA 545 PM EDT THU JUN 28 1990 THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 800 PM EDT FOR PEOPLE IN THE FOLLOWING COUNTIES OF WESTERN PENNSYLVANIA...ALLEGHENY WASHINGTON AND WESTMORELAND AND IN THE NORTHERN WEST VIRGINIA PANHANDLE...BROOKE THUNDERSTORMS WITH REPEATED HEAVY DOWNPOURS ACROSS THESE COUNTIES WILL CAUSE FLASH FLOODING THIS EVENING ALONG SMALL STREAMS AND WHERE DRAINAGE IS POOR. IN THE PITTSBURGH AREA...THE SOUTH HILLS IS MORE VULNERABLE THAN THE NORTH. A FLASH FLOOD WARNING MEANS FLOODING IS IMMINENT OR IN PROGRESS. IF YOU GET ANY INDICATION THAT FLOOD WATERS ARE APPROACHING..MOVE TO HIGHER GROUND. BUT DONT GO THROUGH FLOODING TO GET THERE. THESE STORMS ALSO HAVE DANGEROUS LIGHTNING AND SOME GUSTY WIND. TAKE SHELTER INDOORS FIRST. BUT IF ITS IN AN ARREA PRONE TO FLOODING... BE READY TO MOVE TO HIGHER GROUND IF NEED BE.
What forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Jun 28, 1:09 PM EDT, 4 hours 36 minutes before
PAZ003-015-282300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 110 PM EDT THU JUN 28 1990 SLOW MOVING HEAVY THUNDERSTORMS ARE IN LAWRENCE COUNTY PENNSYLVANIA. THEY HAVE HEAVY DOWNPOURS AND FREQUENT LIGHTNING. THE THUNDERSTORMS IN LAWRENCE COUNTY ARE MOVING EAST AT 25 MPH. A NEW AREA OF THUNDERSTORMS IS ABOUT TO MOVE INTO BEAVER COUNTY PENNSYLVANIA...NORTHWEST OF PITTSBURGH. DRIVE CAREFULLY IN THE HEAVY DOWNPOURS AND LOOK FO R PONDING OF WATER IN THE USUAL LOW SPOTS.
Special weather statement, Jun 28, 1:59 PM EDT, 3 hours 46 minutes before
PAZ003-015-282300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 200 PM EDT THU JUN 28 1990 HEAVY THUNDERSTORMS HAVE MOVED INTO ALLEGHENY...BUTLER...AND ARMSTRONG COUNTIES. THEY ARE MOVING EAST AT 25 MPH AND WILL REACH INDIANA AND WESTMORELAND BY 3 PM. YOU CAN EXPECT HEAVY DOWNPOURS...FREQUENT DANGEROUS LIGHTNING...AND GUSTY WINDS. IT WOULD TAKE SLIGHTLY OVER 2 INCHES OF RAIN IN A SHORT TIME TO CAUSE FLOODING. AS YOY DRIVE..F.BE ON THE CONSTANT LOOKOUT FOR PONDING ON WATER IN LOW SPOTS ON ROADWAYS.
The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 28, 2:44 PM EDT | Flash Flood Warning | PBZ | Allegheny | 2 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.