Alert archive / Pennsylvania / Flash Flood Warnings in 1990
Flash Flood Warning 52, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Jul 12, 1990, 12:40 PM EDT for Jefferson County, Pennsylvania. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Jul 12, 1990, 12:40 PM EDT (16:40 UTC)
- Expired
- Jul 12, 1990, 4:00 PM EDT
- In force
- 3 hr
- Issued by
- NWS Pittsburgh, PA
- Area
- Whole counties
County Jefferson 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, 4.7 hours before the alert went out and 122 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
- 89 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 567 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 89 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPIT 121642 FFWPIT PAC003-019-007-005-065-031-033-122000- BULLETIN BROADCAST IMMEDIATELY FLOOD WARNING FOR STREAMS AND CREEKS NATIONAL WEATHER SERVICE PITTSBURGH PA 1240 PM EDT THU JUL 12 1990 THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A FLOOD WARNING FOR STREAMS AND CREEKS UNTIL 300PM EDT FOR THESE COUNTIES WESTERN PENNSYLVANIA... ALLEGHENY COUNTY AND CLEARFIELD COUNTY... AND HAS EXTENDED THE FLOOD WARNING UNTIL 4PM FOR THE FOLLOWING COUNTIES IN WESTERN PENNSYLVANIA... BEAVER...BUTLER...ARMSTRONG...CLARION...JEFFERSON. HEAVY RAIN IS MOVING INTO ALLEGHENY COUNTY FROM THE SOUTHWEST AS WELL AS INTO CLEARFIELD COUNTY FROM THE WEST. EXTENSIVE FLOODING HAS BEEN REPORTED IN BUTLER AND ARMSTRONG COUNTIES WITH ROADS CLOSED DUE TO HIGH WATER AND STREAMS AND CREEKS REPORTED OVER THEIR BANKS. FLOODING HAS BEEN REPORTED ON TOWNS RUN IN SOUTHERN CLARION COUNTY AND ALONG BIG RUN IN JEFFERSON COUNTY. A FLOOD WARNING REMAINS IN EFFECT UNTIL 2PM FOR INDIANA COUNTY AND 1PM FOR BROOKE HANCOCK AND OHIO COUNTIES IN THE WEST VIRGINIA PANHANDLE. THE FLOOD WARNING FOR LAWRENCE COUNTY HAS BEEN TERMIMATED. RAINFALLS OF AN INCH AND A HALF IN A 60 TO 90 MINUTE PERIOD HAVE BEEN REPORTED IN PORTIONS OF NORTHERN BUTLER AND NORTHERN ARMSTRONG COUNTIES IN THE LATE MORNING HOURS ON ALREADY SATURATED GROUNDS. A FLOOD WARNING FOR STREAMS AND CREEKS MEANS FLOODING IS IMMINENT OR IN PROGRESS. ADDITIONAL FLODD WARNING MAY HAVE TO BE ISSUED THROUGH THE AFTERNOON FOR OTHER COUNTIES. A FLOOD WATCH CONTINUES IN EFFECT FOR MUCH OF WESTERN PENNSYLVANIA AND THE NORHERN PANHANDLE OF WEST VIRGINIA TIL 10 PM. IF YOU GET ANY INDICATION THAT FLOOD WATERS ARE APPROACHING..MOVE TO HIGHER GROUND IMMEDIATELY. DO NOT DRIVE THROUGH FLOODED AREAS. SISK/HIGGINS
The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 12, 9:20 AM EDT | Flash Flood Warning | PBZ | Beaver, Butler | 4 hr |
| Jul 12, 10:35 AM EDT | Flash Flood Warning | PBZ | Armstrong, Clarion, Jefferson | 3 hr |
| Jul 12, 12:08 PM EDT | Flash Flood Warning | PBZ | Indiana | 112 min |
| Jul 12, 12:40 PM EDT | Flash Flood Warning | PBZ | Armstrong, Beaver, Butler, Clarion | 3 hr |
| Jul 12, 12:40 PM EDT | Flash Flood Warning | PBZ | Allegheny | 2 hr |
| Jul 12, 12:40 PM EDT | Flash Flood Warning | PBZ | Clearfield | 2 hr |
| Jul 12, 3:50 PM EDT | Flash Flood Warning | PBZ | Bedford, Cambria | 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.