Alert archive / West Virginia / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 82, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this severe thunderstorm warning at Jul 21, 2009, 12:50 PM EDT for Jefferson County, Ohio; Brooke County, Ohio County, West Virginia. It was in force for 55 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 21, 2009, 12:50 PM EDT (16:50 UTC)
- Expired
- Jul 21, 2009, 1:45 PM EDT
- In force
- 55 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Storm-based polygon
Counties Jefferson County, OH, Brooke County, WV, Ohio County, WV
The radar
The Pittsburgh radar (KPBZ), 48 km from the middle of the area, began a volume at 16:50 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Pittsburgh, PA (KPIT), launched 12:00Z, 4.8 hours before the alert went out and 50 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
- 372 J/kg
- Mixed-layer CIN
- -28 J/kg
- Mixed-layer LCL
- 721 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 95 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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.
NWS Pittsburgh, PA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 21, 12:04 PM EDT, 46 minutes earlier.
Area forecast discussion, Jul 21, 12:04 PM EDT, 46 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 1204 PM EDT TUE JUL 21 2009 .SYNOPSIS... A SERIES OF LOW PRESSURE SYSTEMS WILL KEEP OUR WEATHER UNSETTLED THROUGH THURSDAY. && .NEAR TERM /THROUGH TONIGHT/... UPPER TROUGH WILL SLOWLY SHIFT TO THE NORTHEAST THIS AFTERNOON AND TONIGHT. LOW LEVEL MOISTURE WILL CONTINUE TO PUSH INTO THE REGION AROUND SURFACE WAVE MOVING UP THE EAST COAST. KEPT LIKELY POPS NORTH AND SCATTERED IN THE SOUTH FOR THIS AFTERNOON. SHOWERS SHOULD DIMINISH BY LATE EVENING AS TROUGH PULLS AWAY. && .SHORT TERM /WEDNESDAY THROUGH THURSDAY/... BREAK IN THE WILL BE SHORT LIVED AS ANOTHER UL WAVE WILL MOVE NORTHEASTWARD FROM THE TN VALLEY INTO THE OHIO VALLEY WED. THIS WAVE WILL BE AHEAD OF NEXT TROUGH WHICH WILL SLOWLY PUSH EASTWARD DURING THE SHORT TERM PERIOD. DIFFERENCES IN MODEL SOLUTIONS FOR WED/THU PERIOD SO AT THIS POINT CONFIDENCE IS LOW IN FORECAST. IT DOES APPEAR THAT MORE ACTIVITY WILL DEVELOP WED AND CONTINUE THROUGH THURSDAY. AT THIS POINT...MODELS ARE SHOWING DIFFERENCES IN THE DEVELOPMENT OF A SFC SYSTEM AHEAD OF TROUGH. GFS SHOWING A FASTER AND MORE WESTERLY SOLUTION...WHILE THE NAM IS SLOWER AND FURTHER TO THE EAST. && .LONG TERM /THURSDAY NIGHT THROUGH MONDAY/... TIMING OF COLD FRONT OVER THE WEEKEND IS COMING INTO A BIT BETTER AGREEMENT BETWEEN MODELS. EXPECT COLD FRONT TO MOVE THROUGH THE REGION LATE SATURDAY OR SATURDAY NIGHT. PRECIPITATION ASSOCIATED WITH COLD FRONT SHOULD BE EAST OF CWA BY SUNDAY MORNING FOR THE MOST PART...BUT CANNOT TOTALLY DISCOUNT INSTABILITY SHOWERS SUNDAY AFTERNOON WITH LONG-WAVE TROF STILL HOLDING OFF TO THE WEST. ISOLATED SHOWERS ARE POSSIBLE INTO MONDAY AFTERNOON. && .AVIATION /16Z TUESDAY THROUGH SATURDAY/... PREVAILING VFR IS EXPECTED THIS AFTERNOON...BUT A DISTURBANCE ALONG WITH DIURNAL INSTABILITY WILL LEAD TO SCATTERED THUNDERSTORMS AND REDUCED CONDITIONS. A STRONGER WAVE WILL CROSS WEDNESDAY INTO WEDNESDAY NIGHT BRINGING A GREATER CHANCE FOR STORMS. AS DISTURBANCES MOVE THROUGH...THE UNSETTLED WEATHER PATTERN WILL CONTINUE INTO SATURDAY. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. &&
Hazardous weather outlook, Jul 21, 9:48 AM EDT, 3 hours 2 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 948 AM EDT TUE JUL 21 2009 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029>032-WVZ001>004-012-021>023-041-221400- GARRETT-TUSCARAWAS-CARROLL-COLUMBIANA-COSHOCTON-HARRISON- JEFFERSON OH-MUSKINGUM-GUERNSEY-BELMONT-NOBLE-MONROE-MERCER-VENANGO- FOREST-LAWRENCE-BUTLER-CLARION-JEFFERSON PA-BEAVER-ALLEGHENY- ARMSTRONG-INDIANA-WASHINGTON-WESTMORELAND-GREENE-FAYETTE-HANCOCK- BROOKE-OHIO-MARSHALL-WETZEL-MARION-MONONGALIA-PRESTON-TUCKER- 948 AM EDT TUE JUL 21 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MARYLAND...EAST CENTRAL OHIO...NORTHWEST PENNSYLVANIA...SOUTHWEST PENNSYLVANIA...WEST CENTRAL PENNSYLVANIA...NORTHERN WEST VIRGINIA AND NORTHERN PANHANDLE OF WEST VIRGINIA. .DAY ONE...TODAY AND TONIGHT. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY. NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.
The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 1:44 PM EDT | Severe Thunderstorm Warning | PBZ | Washington | 61 min |
| Jul 21, 2:16 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Washington | 59 min |
| Jul 21, 2:55 PM EDT | Severe Thunderstorm Warning | PBZ | Beaver, Lawrence | 65 min |
| Jul 21, 2:59 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny | 61 min |
| Jul 21, 3:16 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Butler | 59 min |
| Jul 21, 4:27 PM EDT | Severe Thunderstorm Warning | PBZ | Allegheny, Beaver, Butler | 63 min |
| Jul 21, 4:34 PM EDT | Severe Thunderstorm Warning | PBZ | Butler, Lawrence, Mercer | 56 min |
| Jul 21, 5:31 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette | 44 min |
| Jul 21, 7:16 PM EDT | Severe Thunderstorm Warning | PBZ | Venango | 29 min |
| Jul 21, 2:11 PM EDT | Severe Thunderstorm Warning | PBZ | Carroll, Columbiana, Jefferson | 64 min |
| Jul 21, 3:26 PM EDT | Severe Thunderstorm Warning | PBZ | Guernsey | 25 min |
| Jul 21, 2:22 PM EDT | Severe Thunderstorm Warning | PBZ | Tucker | 38 min |
Nearby
Severe Thunderstorm Warnings in West Virginia, 2009Severe Thunderstorm Warnings in Ohio, 2009Every severe thunderstorm warning in 2009
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; radar from the NEXRAD Level II archive.