Alert archive / Pennsylvania / Flash Flood Warnings in 1990
Flash Flood Warning 41, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Jul 9, 1990, 4:36 PM EDT for Allegheny County, Armstrong County, Beaver County, Pennsylvania. It was in force for 114 min.
The area
The counties it named.
The facts
- Issued
- Jul 9, 1990, 4:36 PM EDT (20:36 UTC)
- Expired
- Jul 9, 1990, 6:30 PM EDT
- In force
- 114 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Whole counties
Counties Allegheny County, PA, Armstrong County, PA, 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 12:00Z, 8.6 hours before the alert went out and 31 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
- 1312 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 1037 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 143 m²/s²
- 0-3 km storm-relative helicity
- 130 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 5.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPIT 092037 FFWPIT PAC003-005-007-092230- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE PITTSBURGH PA 436 PM EDT MON JUL 9 1990 THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 630 PM EDT FOR THE FOLLOWING LOCATIONS... IN WEST PENNSYLVANIA ...ALLEGHENY COUNTY...ARMSTRONG COUNTY...BEAVER COUNTY AT 435 PM WEATHER RADAR SHOWED THUNDERSTORMS STILL OVER THESE COUNTIES FLOODING IS STILL OCCURING ON THE SOUTH FORK OF MONTOUR RUN IN ALLEGHENY COUNTY. IN BEAVER COUNTY...FLOODING IS OCCURING NEAR BRIDGEWATER AND ROCHESTER ALONG SMALL STREAMS. SMALL STREAM FLOODING IS ALSO OCCURING IN ARMSTRONG COUNTY IN PINE TOWNSHIP NEAR MOSSGROVE AND TEMPLETON. 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 FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS IMMINENT. MOST FLASH 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 STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT. IT'S IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME KIjLLERS IN HEAVY RAINS. CAMPERS SHOULD AVOID CAMPING ALONG STREAMS OR CREEKS DURING THREATENING RAINS.
The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 9, 12:54 PM EDT | Flash Flood Warning | PBZ | Clarion, Jefferson | 2 hr |
| Jul 9, 12:54 PM EDT | Severe Thunderstorm Warning | PBZ | Clarion, Jefferson | 2 hr |
| Jul 9, 1:12 PM EDT | Flash Flood Warning | PBZ | Clearfield | 108 min |
| Jul 9, 1:12 PM EDT | Flash Flood Warning | PBZ | Armstrong | 108 min |
| Jul 9, 1:21 PM EDT | Severe Thunderstorm Warning | PBZ | Clearfield | 99 min |
| Jul 9, 1:21 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong | 99 min |
| Jul 9, 1:35 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Butler | 85 min |
| Jul 9, 2:09 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 81 min |
| Jul 9, 3:00 PM EDT | Flash Flood Warning | PBZ | Armstrong, Butler | 2 hr |
| Jul 9, 3:01 PM EDT | Flash Flood Warning | PBZ | Allegheny, Beaver | 89 min |
| Jul 9, 3:01 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver | 89 min |
| Jul 9, 3:50 PM EDT | Flash Flood Warning | PBZ | Washington, Westmoreland | 100 min |
| Jul 9, 3:50 PM EDT | Severe Thunderstorm Warning | PBZ | Washington, Westmoreland | 100 min |
| Jul 9, 4:57 PM EDT | Severe Thunderstorm Warning | PBZ | Somerset | 48 min |
| Jul 9, 6:29 PM EDT | Flash Flood Warning | PBZ | Armstrong | 3 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.