Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 9, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this severe thunderstorm warning at Apr 9, 1991, 8:36 PM EDT for Cambria County, Indiana County, Somerset County, Pennsylvania. It was in force for 54 min. 10 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Apr 9, 1991, 8:36 PM EDT (00:36 UTC)
- Expired
- Apr 9, 1991, 9:30 PM EDT
- In force
- 54 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Whole counties
Counties Cambria County, PA, Indiana County, PA, Somerset County, PA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 9, 8:45 PM EDT | Thunderstorm Wind 0 | Indiana, PA | |
| Apr 9, 8:47 PM EDT | Thunderstorm Wind 0 | Somerset, PA | |
| Apr 9, 8:52 PM EDT | Thunderstorm Wind 0 | Somerset, PA | |
| Apr 9, 9:00 PM EDT | Thunderstorm Wind 0 | Somerset, PA | |
| Apr 9, 9:00 PM EDT | Tornado F1 | Cambria, PA | |
| Apr 9, 9:05 PM EDT | Thunderstorm Wind 0 | Somerset, PA | |
| Apr 9, 9:10 PM EDT | Thunderstorm Wind 0 | Cambria, PA | |
| Apr 9, 9:18 PM EDT | Tornado F1 | Cambria, PA | |
| Apr 9, 9:30 PM EDT | Tornado F1 | Cambria, PA | |
| Apr 9, 9:30 PM EDT | Thunderstorm Wind 0 | Somerset, PA |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Pittsburgh, PA (KPIT), launched 00:00Z, 0.6 hours before the alert went out and 98 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
- 1083 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 1382 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 80 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.0
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, Apr 9, 6:50 PM EDT, 1 hour 46 minutes before
RADAR SUMMARY AND SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 640 PM EDT TUE APR 9 1991 ...STRONG SHOWERS AND THUNDERSTORMS APPROACHING WESTERN PENNSYLVANIA... AT 630 PM...THE PITTSBURGH WEATHER SERVICE RADAR SHOWED SCATTERED SHOWERS AND STRONG THUNDERSTORMS OVER EASTERN OHIO STARTING TO MOVE INTO THE NORTHERN PANHANDLE OF WEST VIRGINIA AND WESTERN PENNSYLVANIA. THE STRONGEST THUNDERSTORMS WERE CURRENTLY OVER EXTREME EASTERN OHIO... MIANLY 50 MILES EITHER SIDE OF A LINE FROM 25 MILES EAST OF CLEVELAND OHIO TO NORTH OF CHARLESTON WEST VIRGINIA. SOME OF THESE STORMS WILL PRODUCE BRIEF HEAVY DOWNPOURS...SMALL HAIL ...STRONG WINDS AND DANGEROUS LIGHTNING. THESE SHOWER<S AND THUNDERSTORMS WILL BE OVER WESTERN PENNSYLVANIA BY 735 PM...AROUND THE SAME TIME AS THE PIRATES BASEBALL GAME. A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT FOR THE WESTERN THIRD OF PENNSYLVANIA. KOHLHAGEN/REHAK
Special weather statement, Apr 9, 7:43 PM EDT, 53 minutes before
RADAR SUMMARY AND SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PITTSBURGH PA
740 PM EDT TUE APR 9 1991
...STRONG SHOWERS AND THUNDERSTORMS APPROACHING WESTERN PENNSYLVANIA...
AT 730 PM...THE PITTSBURGH WEATHER SERVICE RADAR SHOWED SCATTERED
SHOWERS AND STRONG THUNDERSTORMS MOVING FROM EASTERN OHIO INTO AND
ACROSS THE NORTHERN PANHANDLE OF WEST VIRGINIA AND WESTERN PENNSYLVANIA.
THE STRONGEST THUNDERSTORMS WERE OVER EXTREME EASTERN OHIO...AND
WESTERN PENNSYLVANIA...40 MILES EITHER SIDE OF A LINE FROM 30 MILES
EAST OF ERIE PA TO 30 MILES SOUTH OF ELKINS WEST VIRGINIA.
SOME OF THESE STORMS WILL PRODUCE BRIEF HEAVY DOWNPOURS...SMALL HAIL
...STRONG WINDS AND DANGEROUS LIGHTNING.
THESYE SHOWERS AND THUNDERSTORMS WILL BE IN DOWNTOWN PITTSBURGH BY
8 PM. A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT FOR THE WESTERN
THIRD OF PENNSYLVANIA.
KOHLHAGEN/REHAKThe office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 8:13 PM EDT | Flash Flood Warning | PBZ | Allegheny, Beaver, Greene, Washington | 3 hr |
| Apr 9, 8:46 PM EDT | Tornado Warning | PBZ | Fayette | 119 min |
| Apr 9, 9:10 PM EDT | Flash Flood Warning | PBZ | Armstrong, Butler | 2 hr |
| Apr 9, 9:24 PM EDT | Severe Thunderstorm Warning | PBZ | Bedford, Blair | 66 min |
| Apr 9, 9:24 PM EDT | Severe Thunderstorm Warning | PBZ | Clearfield, Jefferson | 66 min |
| Apr 9, 9:36 PM EDT | Tornado Warning | PBZ | Bedford | 54 min |
| Apr 9, 8:13 PM EDT | Flash Flood Warning | PBZ | Brooke, Marshall, Ohio | 92 min |
| Apr 9, 8:13 PM EDT | Flash Flood Warning | PBZ | Hancock | 92 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 1991Every severe thunderstorm warning in 1991
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.