Alert archive / Pennsylvania / Severe Thunderstorm Warnings in 2007
Severe Thunderstorm Warning 186, NWS Pittsburgh, PA
NWS Pittsburgh, PA issued this severe thunderstorm warning at Aug 7, 2007, 12:35 PM EDT for Venango County, Pennsylvania. It was in force for 40 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
- Aug 7, 2007, 12:35 PM EDT (16:35 UTC)
- Expired
- Aug 7, 2007, 1:15 PM EDT
- In force
- 40 min
- Issued by
- NWS Pittsburgh, PA
- Area
- Counties, with a storm outline in the text
County Venango County, PA
The radar
The Pittsburgh radar (KPBZ), 104 km from the middle of the area, began a volume at 16:38 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, 4.6 hours before the alert went out and 114 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
- 817 J/kg
- Mixed-layer CIN
- -80 J/kg
- Mixed-layer LCL
- 613 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- -23 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
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 Aug 7, 8:10 AM EDT, 4 hours 25 minutes earlier.
Area forecast discussion, Aug 7, 8:10 AM EDT, 4 hours 25 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 810 AM EDT TUE AUG 7 2007 .SYNOPSIS... A FRONTAL BOUNDARY WILL WAVER ACROSS THE REGION INTO THURSDAY FRIDAY WITH UPPER LEVEL IMPULSES MOVING ALONG IT. THIS WILL KEEP VERY WARM AND HUMID CONDITIONS WITH PERIODS OF THUNDERSTORMS INTO LATE WEEK. THE FRONT WILL PUSH WELL SOUTH FOR THE WEEKEND WITH COOLER AND LESS HUMID CONDITIONS. && .NEAR TERM /THROUGH TONIGHT/... LATEST WATER VAPOR IMAGERY SHOWS AN UPPER LEVEL DISTURBANCE MOVING EAST ACROSS THE LOWER GREAT LAKES...WITH RADAR SHOWING A SWATH OF PRECIP CROSS NORTHERN OHIO. CLOUDS FROM THIS AREA OF PRECIP IS EXTENDING SOUTHEAST ACROSS WESTERN PA TO EAST-CENTRAL OHIO. FURTHER SOUTH...AREAS OF FOG PERSIST IN THE VERY MOIST LOW-LEVEL ATMOSPHERE...WITH VISIBILITIES LOCALLY REDUCED TO ONE HALF MILE OR LESS. THINK THE FOG AND LOW STRATUS WILL GRADUALLY DISSIPATE BY LATE THIS MORNING AS THE LIFT FROM THE UPPER LEVEL DISTURBANCE APPROACHES. DEBRIS FROM CONVECTION ACROSS THE GREAT LAKES WILL BE MOVING ACROSS REGION TODAY TO KEEP SKIES AT LEAST PARTLY SUNNY. THIS MAY HELP TO KEEP TEMPERATURES DOWN A BIT BUT STILL TRENDED TOWARD WARMER GFS MOS. NEXT MCS WILL BE MOVING ACROSS OHIO AND MICHIGAN THIS AFTERNOON AND EXPECT THIS SYSTEM TO BRING SHOWERS AND STORMS LATE TODAY AND TONIGHT WITH HIGHEST POPS NORTH OF PITTSBURGH CLOSER TO UPPER SUPPORT MOVING INTO ONTARIO. PORTIONS OF EAST-CENTRAL OHIO AND THE WEST VIRGINIA PANHANDLE ARE IN A SLIGHT RISK OF SEVERE TSTMS FOR TONIGHT. WITH BEST LIFT AND JET DYNAMICS NORTH WILL NOT MENTION IN FORECAST AND HIGHLIGHT IN HWO. STILL QUITE HUMID THROUGH PERIOD. && .SHORT TERM /WEDNESDAY THROUGH WEDNESDAY NIGHT/... STILL A CHANCE OF LEFTOVER SHOWERS AND STORMS EARLY WEDNESDAY THEN REGION SHOULD BE BETWEEN SYSTEMS AND UNDER WEAK RIDGE INTO WEDNESDAY NIGHT. STILL QUITE WARM AND HUMID. && .LONG TERM /THURSDAY THROUGH MONDAY/... SIGNIFICANT SHORTWAVE AND FRONT THEN ARRIVES FOR THURSDAY INTO FRIDAY AS UPPER RIDGE SHIFTS WEST ALLOWING TROUGHING INTO NORTHEAST U.S AND FRONT TO SHIFT WELL SOUTH. SHOWERS AND STORMS THURSDAY INTO FRIDAY THEN LESS HUMID AND BACK TO NEAR NORMAL TEMPS FOR WEEKEND INTO MONDAY. && .AVIATION /12Z TUESDAY THROUGH SATURDAY/... VLIFR TO IFR CONDITIONS WILL IMPROVE IN THE NEXT 1-3 HOURS AS LIFT INCREASES ACROSS THE AREA IN ADVANCE OF THE UPPER LEVEL DISTURBANCE. FROM LATE THIS MORNING ON...A MAINLY VFR CIG FORECAST EXPECTED. SCT MID DECK WITH MAINLY BKN CI AS REMNANTS FROM DECAYING COMPLEXES MOVES EASTWARD. MODELS SHOWING SOME DIFFERENCES TODAY WITH TIMING AND PLACEMENT OF COMPLEX. CONSENSUS IS REMNANTS OF IA...IL COMPLEX WILL CLIP THE AREA TODAY. APPEARS AS IF SOUTHERN HALF WILL SEE PRECIP WEAKEN AS HEAVIER AREA OF TRW MOVES ACROSS NORTHERN GREAT LAKES WITH SFC LOW. THIS WILL MEAN MORE OF A MID DECK ACROSS THE AREA TODAY WITH SCT RW- AND TRW-. BOUNDARY ASSOCIATED WITH FIRST SFC LOW MOVES THROUGH TONIGHT WHICH WILL BRING ANOTHER LINE OF ACTIVITY THIS EVENING. A BREAK IN THE ACTIVITY IS EXPECTED WED INTO THE FIRST HALF OF THU. NEXT SFC LOW WILL MOVE THROUGH AREA THU NIGHT. THIS WILL BRING ANOTHER AREA OF TRW THROUGH AREA BY LATE THU AFTERNOON INTO FRI MORNING. AT THIS TIME MODELS SHOWING THIS SECOND SYSTEM BRINGING HEAVIER AND MORE WIDESPREAD ACTIVITY WITH LOWER CLOUDS AND VIS. FINALLY SOME RELIEF BY LATE FRIDAY AND INTO THE WEEKEND. HIGH PRESSURE WILL BRING VFR CONDITIONS FOR THE END OF THE LONG TERM. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. &&
Hazardous weather outlook, Aug 7, 8:31 AM EDT, 4 hours 4 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 831 AM EDT TUE AUG 7 2007 OHZ039>041-048>050-057>059-PAZ007>009-013>016-020>023-030-WVZ001-002- 081000- TUSCARAWAS-CARROLL-COLUMBIANA-COSHOCTON-HARRISON-JEFFERSON OH- MUSKINGUM-GUERNSEY-BELMONT-MERCER-VENANGO-FOREST-LAWRENCE-BUTLER- CLARION-JEFFERSON PA-BEAVER-ALLEGHENY-ARMSTRONG-INDIANA-WESTMORELAND- HANCOCK-BROOKE- 831 AM EDT TUE AUG 7 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EAST CENTRAL OHIO...NORTHWEST PENNSYLVANIA...SOUTHWEST PENNSYLVANIA...WEST CENTRAL PENNSYLVANIA AND NORTHERN PANHANDLE OF WEST VIRGINIA. .DAY ONE...TODAY AND TONIGHT THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS LATE THIS AFTERNOON AND TONIGHT ACROSS THE REGION. AN UPPER LEVEL DISTURBANCE WILL MOVE ALONG A STALLED FRONTAL BOUNDARY CAUSING THUNDERSTORMS TO DEVELOP. SOME OF THESE STORMS MAY BE SEVERE WITH DAMAGING WINDS THE MAIN THREAT. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THROUGH TONIGHT. MDZ001-OHZ068-069-PAZ029-031-032-WVZ003-004-012-021>023-041-081000- GARRETT-NOBLE-MONROE-WASHINGTON-GREENE-FAYETTE-OHIO-MARSHALL-WETZEL- MARION-MONONGALIA-PRESTON-TUCKER- 831 AM EDT TUE AUG 7 2007 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN MARYLAND...EAST CENTRAL OHIO...SOUTHWEST 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... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
In the hours before
Special weather statement, Aug 7, 10:35 AM EDT, 2 hours before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 1035 AM EDT TUE AUG 7 2007 PAZ007-008-071530- MERCER PA-VENANGO PA- 1035 AM EDT TUE AUG 7 2007 ...THUNDERSTORMS... THUNDERSTORMS TO MOVE THROUGH VENANGO AND MERCER COUNTIES... AT 1036 AM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED STRONG THUNDERSTORMS 21 MILES NORTHWEST OF HERMITAGE...OR ABOUT 20 MILES NORTHWEST OF SHARON...MOVING EAST AT 45 MPH. SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE... FREDONIA...HERMITAGE...KENNERDELL...MAURICE K GODDARD STATE PARK... MERCER...OIL CITY...OIL CREEK STATE PARK...POLK...SENECA... STONEBORO...SUGARCREEK AND VAN KEEP AN EYE TO THE SKY AND MOVE TO A SAFE PLACE IF THUNDERSTORMS APPROACH. PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772. FREQUENT...INTENSE LIGHTNING AND THUNDERSTOM WIND GUSTS OF 40 TO 50 MILES PER HOUR ARE REPORTED WITH THESE STORMS. IF OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES.
Special weather statement, Aug 7, 11:22 AM EDT, 1 hour 13 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 1122 AM EDT TUE AUG 7 2007 OHZ040-041-PAZ013-020-071615- BEAVER PA-CARROLL OH-COLUMBIANA OH-LAWRENCE PA- 1122 AM EDT TUE AUG 7 2007 ...THUNDERSTORMS... THUNDERSTORMS TO MOVE THROUGH THE FOLLOWING COUNTIES... COLUMBIANA...CARROLL...BEAVER AND LAWRENCE... AT 1112 AM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 27 MILES NORTH OF COLUMBIANA TO 7 MILES NORTHWEST OF CARROLLTON...OR ALONG A LINE EXTENDING FROM 16 MILES WEST OF SHARON TO 4 MILES NORTH OF DELLROY...MOVING EAST AT 25 MPH. SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE... BEAVER...BEAVER FALLS...BLACKHAWK...ELLWOOD CITY...NEW CASTLE... SHIPPINGPORT...AUGUSTA...BEAVER CREEK STATE PARK...CARROLLTON... COLUMBIANA...EAST PALESTINE...EAST ROCHESTER...GUILFORD LAKE STATE PARK...LEESVILLE LAKE PARK...LEETONIA...LISBON...MECHANICSTOWN... MILLPORT AND SALINEVILLE KEEP AN EYE TO THE SKY AND MOVE TO A SAFE PLACE IF THUNDERSTORMS APPROACH. PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL WEATHER SERVICE BY CALLING TOLL FREE...1-877-633-6772. FREQUENT...INTENSE LIGHTNING...STRONG GUSTY WINDS AND TORRENTIAL DOWNPOURS ARE REPORTED WITH THESE STORMS. IF OUTDOORS...STAY AWAY FROM ISOLATED HIGH OBJECTS SUCH AS TREES. MOVE INDOORS IF POSSIBLE. WHEN INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING TELEPHONES UNLESS IT IS AN EMERGENCY. TRY TO UNPLUG UNNECESSARY ELECTRICAL APPLIANCES BEFORE THE THUNDERSTORM APPROACHES.
Local storm report, Aug 7, 11:42 AM EDT, 53 minutes before
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</html>Special weather statement, Aug 7, 12:30 PM EDT, 5 minutes before
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</html>The office that day
Everything else NWS Pittsburgh, PA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 7, 10:51 AM EDT | Severe Thunderstorm Warning | PBZ | Mercer | 54 min |
| Aug 7, 4:03 PM EDT | Severe Thunderstorm Warning | PBZ | Fayette, Westmoreland | 57 min |
| Aug 7, 6:37 PM EDT | Severe Thunderstorm Warning | PBZ | Jefferson | 53 min |
| Aug 7, 7:05 PM EDT | Flash Flood Warning | PBZ | Jefferson | 3 hr |
Nearby
Severe Thunderstorm Warnings in Pennsylvania, 2007Every severe thunderstorm warning in 2007
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.