Alert archive / Pennsylvania / Flash Flood Warnings in 1990
Flash Flood Warning 45, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this flash flood warning at Jul 10, 1990, 1:50 PM EDT for Jefferson County, Pennsylvania. It was in force for 93 min.
The area
The counties it named.
The facts
- Issued
- Jul 10, 1990, 1:50 PM EDT (17:50 UTC)
- Expired
- Jul 10, 1990, 3:23 PM EDT
- In force
- 93 min
- 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, 5.8 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
- 370 J/kg
- Mixed-layer CIN
- -70 J/kg
- Mixed-layer LCL
- 678 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- -37 m²/s²
- 0-3 km storm-relative helicity
- 8 m²/s²
- Significant tornado parameter
- -0.0
- Supercell composite
- -0.2
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KPIT 101752 FFWPIT PAC019-005-065-063-033-102100- BULLETIN - EBS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE PITTSBURGH PA 150 PM EDT TUE JUL 10 1990 THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 500PM EDT FOR THE FOLLOWING COUNTIES.... IN WEST PENNSYLVANIA ...BUTLER COUNTY...ARMSTRONG COUNTY...NORTHERN INDIANA COUNTY... SOUTHERN CLEARFIELD COUNTY...AND SOUTHERN JEFFERSON COUNTY. SINCE 10AM THIS MORNING NEARLY 2 INCHES OF RAIN HAS FALLEN AT THE MAHONING DAM RESERVOIR IN EXTREME NORTHERN ARMSTRONG COUNTY WITH WEATHER SERVICE RADAR INDICATING A LINE OF SHOWERS AND THUNDERSTORMS DEVELOPING AND MOVING SOUTHEASTWARD ACROSS THIS WARNING AREA WHERE HEAVIER RAINS FELL YESTERDAY AND SOILS ARE SATURATED. 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 KILLERS IN HEAVY RAINS. CAMPERS SHOULD AVOID CAMPING ALONG STREAMS OR CREEKS DURING THREATENING RAINS. MOST DEATHS IN FLASH FLOODING 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...5EVEN A SMALL ONE...ON FOOT.
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, Jul 10, 10:40 AM EDT, 3 hours 10 minutes before
PAZ001>006-013>015-WVZ001-101900- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 1040AM EDT TUE JUL 10 1990 ...HIGH HUMIDITY CONTINUES ACROSS THE REGION WITH THE THREAT FOR MORE SHOWERS AND THUNDERSTORMS... HEAVY RAINS SOAKED THE REGION YESTERDAY ALONG WITH SEVERE THUNDERSTORMS THAT RESULTED IN SOME FLOODING...DANGEROUS LIGHTNING...GUSTY WINDS AND SOME HAIL. RAINFALL AMOUNTS OF 1.5 TO 3.0 INCHES WERE COMMON ACROSS SOME COUNTIES IN WESTERN PENNSYLVANIA YESTERDAY NAMELY CRAWFORD...VENANGO...FOREST...MCKEAN...CAMERON...CLEARFIELD...BEAVER... ALLEGHENY...BUTLER...ARMSTRONG...CLARION...JEFFERSON...INDIANA... SOMERSET AND FAYETTE. THE HEAVIEST RAIN REPORTED WAS 5.10 INCHES AT LOCK 8 MOSGROVE IN ARMSTRONG COUNTY BETWEEN 1 AND 5PM YESTERDAY AFTERNOON. SHOWERS AND THUNDERSTORMS WILL REDEVELOP ACROSS THE REGION DURING THE AFTERNOON AND EVENING HOURS. HEAVY DOWNPOURS ARE POSSIBLE WITH THESE STORMS. THE AREAS THAT SEEM MOST VULNERABLE FOR HEAVY RAINS WILL BE THE SOUTHERN HALF OF WESTERN PENNSYLVANIA AND THE NORTHERN WEST VIRGINIA PANHANDLE. ALTHOUGH NO WATCHES ARE IN EFFECT PRESENTLY...A FLASH FLOOD WATCH MAY HAVE TO BE ISSUED DURING THE AFTERNOON OR EVENING FOR THE NORTHERN WEST VIRGINIA PANHANDLE...SOUTHWESTERN PENNSYLVANIA... THE LAUREL AND SOUTH CENTRAL MOUNTAINS AND THE SOUTH CENTRAL AREA. THIS SYSTEM WILL BE CLOSELY MONITORED. LISTEN FOR FURTHER STATMENTS AND ADVISORIES. SISK/HIGGINS/RUMBURGi
The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 1:50 PM EDT | Flash Flood Warning | PBZ | Armstrong, Butler, Indiana | 3 hr |
| Jul 10, 1:50 PM EDT | Flash Flood Warning | PBZ | Clearfield | 3 hr |
| Jul 10, 3:40 PM EDT | Severe Thunderstorm Warning | PBZ | Butler | 65 min |
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.