Alert archive / Pennsylvania / Flash Flood Warnings in 1990
Flash Flood Warning 121, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Dec 30, 1990, 12:30 PM EST for 5 counties in Pennsylvania. It was in force for 5 hr.
The area
The counties it named.
The facts
- Issued
- Dec 30, 1990, 12:30 PM EST (17:30 UTC)
- Expired
- Dec 30, 1990, 5:00 PM EST
- In force
- 5 hr
- Issued by
- NWS Pittsburgh, PA
- Area
- Whole counties
Counties Allegheny County, PA, Armstrong County, PA, Butler County, PA, Clarion 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
Buffalo Intl Airport, NY (KBUF), launched 12:00Z, 5.5 hours before the alert went out and 256 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
- 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
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPIT 301726 FFWPIT PAC003-007-005-019-031-129-WVC029-009-302200- BULLETIN - EBS ACTIVATION REQUESTED FLOOD WARNING NATIONAL WEATHER SERVICE PITTSBURGH PA 1230 PM EST SUN DEC 30 1990 THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS EXTENDED THE FLOOD WARNING EFFECTIVE UNTIL 500 PM EST FOR THE FOLLOWING LOCATIONS... IN WEST PENNSYLVANIA ...ALLEGHENY COUNTY...ARMSTRONG COUNTY...BEAVER COUNTY ...BUTLER COUNTY...CLARION COUNTY...WESTMORELAND COUNTY... IN THE WEST VIRGINIA PANHANDLE ...BROOKE COUNTY...HANCOCK COUNTY HEAVY RAINS CONTINUE TO FALL OVER THE WARNED COUNTIES AND WIDESPREAD STREAM...CREEK...ROADWAY AND BASEMENT FLOODING HAS BEEN REPORTED. ESPECIALLY HARD HIT IS BEAVER...ARMSTRONG...HANCOCK... NORTHERN ALLEGHENY AND NORTHEASTERN WESTMORELAND COUNTIES. RAINFALL OF BETWEEN 1.50 AND 2.00 INCHES HAVE BEEN COMMON OVER THE WARNED AREA THIS MORNING. MUCH OF IT FALLING IN JUST 3 TO 4 HOURS. ADDITIONAL HEAVY RAINFALL THIS AFTERNOON WILL CAUSE MORE EXTENSIVE FLOODING. 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. A FLOOD WARNING MEANS THAT FLOODING IS OCCURING OR IS IMMINENT. MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS BRIDGES...DIPS OR LOW SPOTS IF WATER COVERS THE ROADWAY. NEVER TRY TO CROSS A FLOWING STR:EAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE TO HIGHER GROUND. PALKO
The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 30, 8:46 AM EST | Flash Flood Warning | PBZ | Allegheny | 4 hr |
| Dec 30, 8:46 AM EST | Flash Flood Warning | PBZ | Clarion | 4 hr |
| Dec 30, 9:04 AM EST | Flash Flood Warning | PBZ | Beaver, Butler | 4 hr |
| Dec 30, 9:04 AM EST | Flash Flood Warning | PBZ | Armstrong | 4 hr |
| Dec 30, 10:41 AM EST | Flash Flood Warning | PBZ | Westmoreland | 5 hr |
| Dec 30, 12:30 PM EST | Flash Flood Warning | PBZ | Beaver | 5 hr |
| Dec 30, 12:55 PM EST | Flash Flood Warning | PBZ | Butler | 4 hr |
| Dec 30, 4:30 PM EST | Flash Flood Warning | PBZ | Allegheny, Armstrong, Butler, Westmoreland | 6 hr |
| Dec 30, 4:30 PM EST | Flash Flood Warning | PBZ | Beaver | 6 hr |
| Dec 30, 4:30 PM EST | Flash Flood Warning | PBZ | Clarion | 6 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.