Isolated severe thunderstorms developed well ahead of a cold front moving across the Great lakes.
Every event with a place to put it. Tap one for its entry below.
Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS PBZ wrote it up.
Isolated severe thunderstorms developed well ahead of a cold front moving across the Great lakes.
The local office's own words before the first event, 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 the first event at Jun 18, 2:03 PM EST, 52 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 303 PM EDT MON JUN 18 2007 .SYNOPSIS... GENERALLY DRY AND WARM WEATHER TONIGHT AS HIGH PRESSURE OVER THE EAST COAST CONTROLS THE AREA. A COOL FRONT PASSING THROUGH THE GREAT LAKES LATE TUESDAY WILL BRING LATE DAY THUNDERSTORMS FOLLOWED BY TEMPERATURES CLOSER TO NORMAL THE REST OF THE WEEK. && .NEAR TERM /THROUGH TONIGHT/... BASED ON RECENT RADAR DATA, COUPLED WITH THE LATEST RUC MODEL RUN, EXPECT ISOLATED THUNDERSTORMS INTO EARLY TONIGHT. INITIAL INITIATION ZONES WILL BE NEAR LAKE ERIE AND THE APPALACHIAN MOUNTAINS. SPC SUGGESTS A SMALL POTENTIAL FOR GUSTY WIND AND HAIL. AMPLE SURFACE MOISTURE ALONG WITH SLOW AND ERRATIC MOVEMENT OF THUNDERSTORM CELLS CAN LEAD TO ISOLATED RAIN AMOUNTS NEAR 2 INCHES. REGARDING FLOOD POTENTIAL, SOIL CONDITIONS AND VEGETATION SHOULD HANDLE LARGELY HANDLE THIS. THERE CAN BE SOME HAZE LATE TONIGHT, BUT NOT SUFFICIENT TO MENTION. && .SHORT TERM /TUESDAY THROUGH WEDNESDAY/... TUESDAY AND TUESDAY NIGHT POSE A CHALLENGING FORECAST, WITH NAM AND GFS MODEL RUNS, INCLUDING MOST ENSEMBLE MEMBERS, CONTINUING TO SHOW THE COOL FRONT MOVING THROUGH THE UPPER OHIO VALLEY DURING PEAK HEATING, AND HENCE PEAK INSTABILITY, PERIOD. AS INDICATED BY SPC, SEVERE POTENTIAL APPEARS TO BE INCREASING, SO HAVE INCLUDED MENTION OF GUSTY WINDS WITH LATE DAY THUNDERSTORMS. POPS NEAR 70 PERCENT. IN WAKE OF COLD FRONTAL PASSAGE, CONDITIONS STABILIZE, ENDING THE PRECIPITATION THREAT, AND LEADING TO TEMPERATURES BECOMING MORE NEAR NORMAL. && .LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/... FOR THE REMAINDER OF THE WEEK/WEEKEND...TEMPERATURES WILL BE NEAR SEASONAL AVERAGES WITH SHORT WAVES IN NORTHWEST TO ZONAL FLOW DEFINING PRECIP CHANCES. OVERALL CONFIDENCE IS MINIMAL WITH USUAL TIMING ISSUES...SO WILL KEEP POPS SLIGHT TO CLOSE THE WEEK GIVEN LIMITED LOW LEVEL MOISTURE SUPPLY. CURRENTLY ANOTHER FRONT IS PROGGED FOR THE WEEKEND SO WILL GO WITH SLIGHT CHANCE POPS OVER THE WEEKEND. && .AVIATION /19Z MONDAY THROUGH SATURDAY/... NAM FORECAST SOUNDINGS SHOW CUMULUS DEVELOPMENT THIS AFTERNOON AND EVENING, WITH BASES NEAR 4 KFT. MVFR FLIGHT CONDITIONS POSSIBLE IN ISOLATED THUNDERSTORMS, BUT TOO SMALL A POTENTIAL TO MENTION FOR TAFS. MVFR VISIBILITIES ALSO POSSIBLE IN LATE NIGHT HAZE, BUT MOST OF THIS WILL BE CONFINED TO RIVER VALLEYS BELOW MOST TAF SITES. CUMULUS CEILINGS SHOULD DEVELOP TUESDAY AFTER 14Z. AS THUNDERSTORMS POTENTIAL SHARPLY RISES LATE TUESDAY, POSSIBILITY OF IFR CONDITIONS LIKEWISE INCREASES. SURFACE WINDS CAN ALSO GUST ABOVE 25 KTS. GENERALLY. IN THUNDERSTORMS, SURFACE WIND GUSTS CA GO OVER 40 KTS. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. && 66
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE PITTSBURGH PA 342 AM EDT MON JUN 18 2007 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029>032-WVZ001>004-012-021>023-041-190745- 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- 342 AM EDT MON JUN 18 2007 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...TUESDAY THROUGH SUNDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE PITTSBURGH PA 325 PM EDT MON JUN 18 2007 PAZ007-182030- MERCER PA- 325 PM EDT MON JUN 18 2007 ...THUNDERSTORMS... THUNDERSTORMS TO MOVE THROUGH THE FOLLOWING COUNTY... MERCER... AT 321 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR IN PITTSBURGH INDICATED STRONG THUNDERSTORMS 10 MILES NORTHWEST OF FREDONIA... MOVING EAST AT 10 MPH. SOME LOCATIONS THAT WILL BE IMPACTED BY THESE STORMS INCLUDE... FREDONIA...HERMITAGE...MAURICE K GODDARD STATE PARK...MERCER... SHARON AND STONEBORO SOME OF THESE STORMS WILL BE ACCOMPANIED BY DANGEROUS LIGHTING... SMALL HAIL...WIND GUSTS TO 40 MPH AND HEAVY DOWNPOURS THAT MAY CAUSE PONDING OF WATER ON ROAD SURFACES. 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.
The Pittsburgh radar (KPBZ), 94 km away, was scanning. The volume nearest the first event began at 19:55 UTC.
3 thunderstorm wind, 2 hail. Local standard time, as filed.
Emergency management reported trees down along Kids Mill RD southeast of Greenville.
Emergency management reported trees down in Trafford and North Huntingdon.
A trained spotter reported trees down along old RT 119 near New Stanton.
Amateur radio reported nickel size hail in Sharpsville.
The public reported nickel size hail in MT Pleasant.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2007Every state in 2007This day in weather historyWarnings in Pennsylvania, June 2007
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 37855, 37869, 37870, 37858, 37872.