Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 20, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this severe thunderstorm warning at Jun 8, 1987, 7:01 PM EDT for Allegheny County, Westmoreland County, Pennsylvania. It was in force for 59 min.
The area
The counties it named.
The facts
- Issued
- Jun 8, 1987, 7:01 PM EDT (23:01 UTC)
- Expired
- Jun 8, 1987, 8:00 PM EDT
- In force
- 59 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Whole counties
Counties Allegheny 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 12:00Z, 11.0 hours before the alert went out and 32 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
- 20 J/kg
- Mixed-layer CIN
- -383 J/kg
- Mixed-layer LCL
- 1483 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 111 m²/s²
- 0-3 km storm-relative helicity
- 107 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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, Jun 8, 3:13 PM EDT, 3 hours 48 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH, PA 312 PM EDT MON JUN 08 1987 ...VERY HEAVY THUNDERSTORMS DEVELOPING ACROSS THE NORTHERN SECTIONS OF WESTERN PENNSYLVANIA... AT 310 PM NATIONAL WEATHER SERVICE RADAR SHOWED VERY HEAVY THUNDERSTORMS DEVELOPING FROM MERCER COUNTY NORTHEASTWARD TO NEAR EMPORIUM IN CAMERON COUNTY. THE HEAVIEST STORMS WERE LOCATED OVER FOREST AND ELK COUNTIES AND WERE HEADED TOWARDS CLARION...JEFFERSON AND CLEARFIELD COUNTIES. ALL THUNDERSTORMS WERE MOVING SOUTHEAST AT 40 MPH. THESE STORMS WILL CONTAIN STRONG GUSTY WINDS...DANGEROUS LIGHTNING... HAIL AND HEAVY DOWNPOURS. IF THREATENING WEATHER APPROACHES...GO TO A SAFE PLACE IMMEDIATELY. END/COgMEAUX
Special weather statement, Jun 8, 4:36 PM EDT, 2 hours 25 minutes before
SPECIAL WEATHER STATEMENT FOR WESTERN PENNSYLVANIA AND THE NORTHERN PANHANDLE OF WEST VIRGINIA... NATIONAL WEATHER SERVICE PITTSBURGH, PA 435 PM EDT MON JUN 08 1987 ...SEVERE THUNDERSTORM WATCH NOW IN EFFECT FOR A LARGE PORTION OF WESTERN PENNSYLVANIA AND THE NORTHERN PANHANDLE OF WEST VIRGINIA... AND A PORTION OF EASTERN OHIO. THE NATIONAL SEVERE STORM FORECAST CENTER IN KANSAS CITY HAS ISSUED A SEVERE THUNDERSTORM WATCH UNTIL 10 PM THIS EVENING FOR A LARGE PORTION OF WESTERN PENNSYLVNIA...EXCLUDING THE FOLLOWING COUNTIES IN WESTERN PENNSYLVANIA...THEY ARE GREENE...FAYETTE...SOMERSET...BEDFORD AND FULTON. ONLY MARSHALL COUNTY IN THE NORTHERN PANHANDLE OF WEST VIRGINIA IS EXCLUDED FROM THIS WATCH. A SEVERE THUNDERSTORM WATCH MEANS SEVERE THUNDERSTORMS ARE POSSIBLE IN AND CLOSE TO THE WATCH AREA...SO BE ON THE LOOKOUT FOR THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE WARNINGS. < END/COMEAUX
Special weather statement, Jun 8, 5:50 PM EDT, 1 hour 11 minutes before
COMBINED RADAR AND SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH, PA 547 PM EDT MON JUN 08 1987 AT 530 PM, PITTSBURGH WEATHER RADAR SHOWED A BAND OF VERY HEAVY THUNDERSTORMS STRETCHING FROM ELK COUNTY WESTWARD ACROSS FOREST.. CLARION..SOUTHERN VENANGO..MERCER AND LAWRENCE COUNTIES IN PENNSYLVANIA INTO TRUNBULL..MAHONING AND PORTAGE COUNTIES IN OHIO. THE BAND CONTINUES WESTWARD TO SOUTH OF CLEVELAND. THESE STORMS ARE MOVING SOUTHEAST AT 50 MPH AND WILL MOVE INTO BEAVER..BUTLER..JEFFERSON AND CLEARFIELD COUNTIES DURING THE NEXT HOUR. A SEVERE THUNDERSTORM WATCH CONTINUES IN EFFECT UNTIL 10 PM FOR ALMOST ALL OF WESTERN PENNSYLVANIA ..THE NORTHERN PANHANDLE OF WEST VIRGINIA AND MUCH OF NORTHERN OHIO. STAY TUNED FOR FURTHER STATEMENTS AND POSSIBLE WARNINGS. FH/CHH
The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 8, 6:25 PM EDT | Tornado Warning | PBZ | Beaver | 65 min |
| Jun 8, 6:41 PM EDT | Severe Thunderstorm Warning | PBZ | Armstrong, Butler | 59 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 1987Every severe thunderstorm warning in 1987
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.