Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 21, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this severe thunderstorm warning at Apr 11, 1999, 2:29 PM EDT for Westmoreland County, Pennsylvania. It was in force for 61 min. 1 report 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 11, 1999, 2:29 PM EDT (18:29 UTC)
- Expired
- Apr 11, 1999, 3:30 PM EDT
- In force
- 61 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Whole counties
County Westmoreland County, PA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 11, 2:30 PM EDT | Hail 0.75 | Greensburg, 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.
The nearest sounding before it
Pittsburgh, PA (KPIT), launched 12:00Z, 6.5 hours before the alert went out and 55 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 506 m above ground
- 0-6 km bulk shear
- 67 kt
- 0-1 km storm-relative helicity
- 180 m²/s²
- 0-3 km storm-relative helicity
- 560 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
999 WUUS1 KPIT 111830 RRA SVRPIT PAC129-111930- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE PITTSBURGH PA 229 PM EDT SUN APR 11 1999 THE NATIONAL WEATHER SERVICE IN PITTSBURGH HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WESTMORELAND COUNTY IN SOUTHWESTERN PENNSYLVANIA. * UNTIL 330 PM EDT. * AT 229 PM...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM GREENSBURG...MOVING EAST AT 40 MPH. * THIS SEVERE THUNDERSTORM WILL BE NEAR... LATROBE AT 245 PM. DERRY AT 250 PM. <<CALL TO ACTION>>DAMAGING WINDS AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS .END/JP &
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 11, 12:45 PM EDT, 1 hour 44 minutes before
MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029>032-WVZ001>004-012-021>023-041-112300- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 1245 PM EDT SUN APR 11 1999 ...SEVERE THUNDERSTORM POTENTIAL LIMITED TO PA AND WV THIS AFTERNOON... THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS IN WESTERN PENNSYLVANIA... AND NORTHERN WEST VIRGINIA EAST OF WETZEL COUNTY...AND IN GARRETT COUNTY MARYLAND. A COLD FRONT PUSHING THROUGH EASTERN OHIO HAS REDUCED THE THREATENED AREA. WHILE THERE MAY BE A FEW THUNDERSTORMS IN EAST CENTRAL OHIO AND THE NORTHERN PANHANDLE OF WEST VIRGINIA...NONE IS EXPECTED TO BE SEVERE. THERE IS THREAT OF FLASH FLOODING THE EAST CENTAL OHIO AND THE NORTHERN PANHANDLE OF WEST VIRGINIA UNTIL 4 PM. AND A THREAT OF FLOODING IN THE REST OF NORTHERN WEST VIRGINIA...WESTERN PENNSYLVANIA...AND GARRETT COUNTY MARYLAND UNTIL 10 PM TONIGHT. SKYWARN ACTIVATION MAY BE NEEDED AFTER 2 PM.
Special weather statement, Apr 11, 12:45 PM EDT, 1 hour 44 minutes before
MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029>032-WVZ001>004-012-021>023-041-112300- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 1245 PM EDT SUN APR 11 1999 ...SEVERE THUNDERSTORM POTENTIAL LIMITED TO PA AND WV THIS AFTERNOON... THERE IS A SLIGHT RISK FOR SEVERE THUNDERSTORMS IN WESTERN PENNSYLVANIA... AND NORTHERN WEST VIRGINIA EAST OF WETZEL COUNTY...AND IN GARRETT COUNTY MARYLAND. A COLD FRONT PUSHING THROUGH EASTERN OHIO HAS REDUCED THE THREATENED AREA. WHILE THERE MAY BE A FEW THUNDERSTORMS IN EAST CENTRAL OHIO AND THE NORTHERN PANHANDLE OF WEST VIRGINIA...NONE IS EXPECTED TO BE SEVERE. THERE IS THREAT OF FLASH FLOODING THE EAST CENTAL OHIO AND THE NORTHERN PANHANDLE OF WEST VIRGINIA UNTIL 4 PM. AND A THREAT OF FLOODING IN THE REST OF NORTHERN WEST VIRGINIA...WESTERN PENNSYLVANIA...AND GARRETT COUNTY MARYLAND UNTIL 10 PM TONIGHT. SKYWARN ACTIVATION MAY BE NEEDED AFTER 2 PM.
Local storm report, Apr 11, 2:12 PM EDT, 17 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
212 PM EDT SUN APR 11 1999
TIME(EDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0205 PM MACOMBER WV 0.75 INCH HAIL
04/11/99 PRESTON SOUTH OF KINGWOOD IN
LAUREL MOUNTAIN.
ENDLocal storm report, Apr 11, 2:12 PM EDT, 17 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
212 PM EDT SUN APR 11 1999
TIME(EDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0205 PM MACOMBER WV 0.75 INCH HAIL
04/11/99 PRESTON SOUTH OF KINGWOOD IN
LAUREL MOUNTAIN.
ENDThe office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 4:16 PM EDT | Severe Thunderstorm Warning | PBZ | Mercer | 29 min |
| Apr 11, 4:32 PM EDT | Severe Thunderstorm Warning | PBZ | Venango | 43 min |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 1999Every severe thunderstorm warning in 1999
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.