Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1990
Severe Thunderstorm Warning 118, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this severe thunderstorm warning at Sep 6, 1990, 11:00 PM EDT for 4 counties in Pennsylvania. It was in force for 60 min.
The area
The counties it named.
The facts
- Issued
- Sep 6, 1990, 11:00 PM EDT (03:00 UTC)
- Expired
- Sep 7, 1990, 12:00 AM EDT
- In force
- 60 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Whole counties
Counties Allegheny County, PA, Fayette 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 00:00Z, 3.0 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
- 62 J/kg
- Mixed-layer CIN
- -179 J/kg
- Mixed-layer LCL
- 1475 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 107 m²/s²
- 0-3 km storm-relative helicity
- 165 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this severe thunderstorm 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, Sep 6, 5:32 PM EDT, 5 hours 28 minutes before
PAZ001>006-013>015-WVZ001-070000- SPECIAL WEATHER STATEMENT AND WEATHER RADAR SUMMARY NATIONAL WEATHER SERVICE PITTSBURGH PA 535 PM EDT THU SEP 6 1990 ...SEVERE THUNDERSTORM COMING THROUGH PITTSBURGH AREA TIL 630 PM... ...SEVERE THUNDERSTORM WATCHES IN EFFECT UNTIL 1100 PM FOR MUCH OF WESTERN PENNSYLVANIA AND THE NORTHERN PANHANDLE OF WEST VIRGINIA... IF YOU ARE IN THE PITTSBURGH AREA...TAKE COVER...INCLUDING THOSE AT THREE RIVERS STADIUM DOWNTOWN. DAMAGING WIND...DEADLY LIGHTNING... TORRENTIAL DOWNPOURS AND LARGE HAIL WILL BE OCCURRING. MOTORISTS SHOULD PULL OVER IN LOW VISIBILITY AND TAKE COVER IF HIGH WINDS THREATEN. HEAVY DOWNPOURS CAN CAUSE RAPID FLOODING WHERE DRAINAGE IS POOR.
Special weather statement, Sep 6, 5:36 PM EDT, 5 hours 24 minutes before
PAZ001>006-013>015-WVZ001-070000- SPECIAL WEATHER STATEMENT AND WEATHER RADAR SUMMARY NATIONAL WEATHER SERVICE PITTSBURGH PA 535 PM EDT THU SEP 6 1990 ...SEVERE THUNDERSTORM COMING THROUGH PITTSBURGH AREA TIL 630 PM... ...SEVERE THUNDERSTORM WARNINGS CONTINUE FOR MOST OF SOUTHWESTERN PENNSYLVANIA AND THE NORTHERN WEST VIRGINIA PANHANDLE TIL 630... ...SEVERE THUNDERSTORM WATCHES IN EFFECT UNTIL 1100 PM FOR MUCH OF WESTERN PENNSYLVANIA AND THE NORTHERN PANHANDLE OF WEST VIRGINIA... IF YOU ARE IN THE PITTSBURGH AREA...TAKE COVER...INCLUDING THOSE AT THREE RIVERS STADIUM DOWNTOWN. DAMAGING WIND...DEADLY LIGHTNING... TORRENTIAL DOWNPOURS AND LARGE HAIL WILL BE OCCURRING. MOTORISTS SHOULD PULL OVER IN LOW VISIBILITY AND TAKE COVER IF HIGH WINDS THREATEN. HEAVY DOWNPOURS CAN CAUSE RAPID FLOODING WHERE DRAINAGE IS POOR. THE PITTSBURGH STORM IS JUST ONE OF MANY ALONG A LINE OF SEVERE STORMS THAT EXTENDS FROM DUBOIS THROUGH PITTSBURGH TO WHEELING WEST VIRGINIA AND CAMBRIDGE OHIO. THE STORMS WERE MOVING SOUTHEAST AT 25 MILES AN HOUR. EACH OF THESE STORMS ARE DANGEROUS. TAKE COVER AS THEY COME THROUGH. DONT DRIVE THROUGH FLOODING.
Special weather statement, Sep 6, 8:10 PM EDT, 2 hours 50 minutes before
PAZ001>006-013>015-WVZ001-070200- SPECIAL WEATHER STATEMENT AND WEATHER RADAR SUMMARY NATIONAL WEATHER SERVICE PITTSBURGH PA 810 PM EDT THU SEP 6 1990 ...TORNADO WATCH AND FLASH FLOOD WATCH FOR NORTHWESTERN PENNSYLVANIA TIL 1 AM... ...SEVERE THUNDERSTORM WATCH FOR THE CENTRAL PENNSYLVANIA MOUNTAINS TIL 11 PM... RADAR SHOWED TWO BANDS OF DANGEROUS THUNDERSTORMS. THE LEADING BAND OF THUNDERSTORMS WAS OVER THE CENTRAL PENNSYLVANIA MOUNTAINS AS WELL AS NORTHERN WEST VIRGINIA AND WESTERN MARYLAND. THE WORST STORMS WERE BETWEEN MORGANTOWN WEST VIRGINIA AND SOMERSET PENNSYLVANIA HEADING SOUTHEASTWARD AT 30 MPH TOWARD CUMBERLAND MARYLAND. THE SECOND BAND OF THUNDERSTORMS WAS ALONG THE ERIE LAKESHORE OF OHIO...PENNSYLVANIA...AND NEW YORK STATE. THE WORST STORMS WERE BETWEEN CLEVELAND OHIO...ERIE PENNSYLVANIA...AND JAMESTOWN NEW YORK. SOME SCATTERED STORMS HAVE ALSO DEVELOPED OVER NORTHEASTERN OHIO BETWEEN AKRON...YOUNGSTOWN...AND NEW PHILADELPHIA. THESE STORMS TOO WERE MOVING SOUTHEASTWARD AT 30 MPH AND WILL BE MOVING ACROSS MUCH OF NORTHWESTERN PENNSYLVANIA BETWEEN 9 PM AND 1 AM. ANY OF THESE STORMS CAN HAVE DAMAGING WIND...POSSIBLY TORNADOES...LARGE HAIL...DANGEROUS LIGHTNING...AND DOWNPOURS HEAVY ENOUGH TO CAUSE FLOODING. THE FLOODING THREAT IS HIGHEST IN AREAS HARDHIT BY HEAVY THUNDERSTORM RAIN THIS AFTERNOON. TAKE COVER INDOORS WHEN THUNDERSTORMS APPROACH...PREFERABLY IN STRONG BUILDINGS AND AWAY FROM WINDOWS. WHEN CONFRONTED BY FLOODING...SEEK HIGHER GROUND BUT DONT GO THROUGH FLOODING TO GET THERE.
Special weather statement, Sep 6, 10:18 PM EDT, 42 minutes before
PAZ001>006-013>015-WVZ001-070400- SPECIAL WEATHER STATEMENT AND WEATHER RADAR SUMMARY NATIONAL WEATHER SERVICE PITTSBURGH PA 1020 PM EDT THU SEP 6 1990 ...FLASH FLOOD WATCH TIL 4 AM FRIDAY FOR ALL OF WESTERN PENNSYLVANIA AND THE NORTHERN WEST VIRGINIA PANHANDLE... ...TORNADO WATCH FOR NORTHWESTERN PENNSYLVANIA TIL 1 AM... ...SEVERE THUNDERSTORM WATCH FOR SOUTHWESTERN PENNSYLVANIA... SOUTHERN MOUNTAINS...AND WEST VIRGINIA NORTHERN PANHANDLE TIL 4 AM... ...SEVERE THUNDERSTORM WARNINGS FOR AT LEAST 8 WESTERN PENNSYLVANIA COUNTIES AND 4 NORTHERN WEST VIRGINIA PANHANDLE COUNTIES TIL AROUND 11 PM... RADAR SHOWED THE LINE OF SEVERE STORMS ALONG INTERSTATE 80 MOVING SOUTHWARD AT 30 MPH INTO SOUTHERN PENNSYLVANIA AND THE WEST VIRGINIA PANHANDLE. THE STORMS WILL BE MOVING THROUGH THE PITTSBURGH AREA BETWEEN 1030 AND 11 PM. THESE STORMS ARE DANGEROUS...SO TAKE COVER. ALSO PULL OVER AND SEEK HIGHER GROUND IF ROADS BECOME FLOODED. IF HEAVY DOWNPOURS PERSIST...WATCH FOR SMALL STREAMS GOING OUT OF THEIR BANKS.
The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 6, 9:42 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Washington | 78 min |
| Sep 6, 9:42 PM EDT | Severe Thunderstorm Warning | PBZ | Greene | 78 min |
| Sep 6, 9:42 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Clarion, Jefferson | 78 min |
| Sep 6, 9:42 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Butler | 78 min |
| Sep 7, 12:06 AM EDT | Flash Flood Warning | PBZ | Washington | 4 hr |
| Sep 7, 12:06 AM EDT | Flash Flood Warning | PBZ | Allegheny, Westmoreland | 4 hr |
| Sep 7, 4:00 AM EDT | Flash Flood Warning | PBZ | Washington | 4 hr |
| Sep 7, 7:30 AM EDT | Flash Flood Warning | PBZ | Washington | 3 hr |
| Sep 7, 9:45 AM EDT | Flash Flood Warning | PBZ | Washington | 4 hr |
| Sep 7, 1:50 PM EDT | Flash Flood Warning | PBZ | Washington | 3 hr |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 1990Every severe thunderstorm 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.