Severe thunderstorms developed during the afternoon on June 27th as near-record heat over Central PA combined with ample moisture creating plenty of instability.
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 CTP wrote it up.
Severe thunderstorms developed during the afternoon on June 27th as near-record heat over Central PA combined with ample moisture creating plenty of instability.
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 State College, PA wrote its last area forecast discussion before the first event at Jun 27, 12:08 PM EST, 22 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 108 PM EDT WED JUN 27 2007 .SYNOPSIS... BERMUDA HIGH STARTING TO GET SQUASHED TO THE SOUTH AND EAST A BIT...BUT THE HOT AND HUMID AIR IS HERE ALREADY. A COLD FRONT CURRENTLY OVER THE UPPER GREAT LAKES WILL SLOWLY PUSH SOUTH THROUGH THE REGION ON THURSDAY - PROVIDING THE HIGHEST CHANCE FOR WIDESPREAD PRECIPITATION. IN THE WAKE OF THE COLD FRONT...HIGH PRESSURE WILL BRING AN UNSEASONABLY COOL AND DRY AIRMASS SOUTH FROM CANADA...AND PROVIDE RELIEF FROM THE HEAT AND HUMIDITY FOR SATURDAY AND SUNDAY AND PERHAPS BEYOND. && .NEAR TERM /UNTIL 8 PM THIS EVENING/... SEVERE THUNDERSTORM WATCH #456 HAS BEEN ISSUED FOR THE ENTIRE CWA UNTL 0000 UTC. NMRS TSRA BREAKING OUT IN HIGH CAPE/LOW SHEAR ENVIRONMENT...WHICH SHOULD SUPPORT LOCALIZED DAMAGING WNDS/LARGE HAIL THREAT. HAVE DECIDED ON POSTING A HEAT ADVISORY FOR SEVERAL HOURS THIS AFTERNOON ACROSS THE SUSQ VALLEY AND ADJACENT COUNTIES AS HOURLY TEMPS IN MANY AREAS ARE TRENDING A FEW DEG HIGHER LATE THIS MORNING THAN FCST. MOST PLACES SHOULD SEE TEMPS LEVEL OFF NEAR /OR PERHAPS JUST A FEW DEG ABOVE/ THAN PREVIOUSLY FCST MAX TEMPS...WHICH WILL TOP OUT AROUND RECORD VALUES ACROSS THE MID SUSQ VALLEY. CONVECTION TYPE /SIMILAR TO THE PAST FEW DAYS WILL BE PULSE TSRA THE MAIN AREAS OF FOCUS FOR TSRA WILL BE ACROSS THE SCENT MTNS OF PENN EAST TO THE MID AND LWR SUSQ VALLEY...AND ALSO ACROSS THE NW MTNS NEAR THE BOUNDARY OF THE WEAK LAKE ERIE BREEZE. POPS WILL REMAIN IN THE CHC CATEGORY FOR THE AFTERNOON AND EARLY EVENING HOURS...BUT HAVE ADJUSTED VALUES SLIGHTLY UPWARD ACROSS SCENT AND SE PARTS OF OUR COUNTY WARNING AREA BASED ON LLVL THETA-E CONVERGENCE OFF THE NAM /WHICH HAS WORKED QUITE WELL WITH SEVERAL PAST PULSE EVENTS THIS MONTH. SVR WX IS JUST SLIGHTLY MORE OF A CONCERN TODAY THAN YESTERDAY...WHEN WE DID GET ONE SVR STORM AND ONE POSSIBLY SVR STORM. THE SHEAR IS INCREASING AS THE FRONT GETS CLOSER...ESP ACROSS OUR NORTHEASTERN COUNTIES. BUT...SPC HAS TRIMMED THE SLIGHT RISK A BIT FARTHER TO THE NORTHEAST TODAY...AND KEPT US OUT OF SLIGHT RISK. WITH MIXED LAYER CAPES STILL EXCEEDING 1500 J/KG IN SOME AREAS AND...AND 10-15KTS OF SHEAR...WE COULD GET A COUPLE OF SVR PULSERS TODAY. ANOTHER WORRY WOULD BE FOR THESE STORMS TO MOVE LITTLE WITH RESPECT TO THE INFLOW...AND PRODUCE HEAVY RAINFALL. BUT...LACK OF RAIN RECENTLY HAS ALLOWED THE 1-HR FLASH FLOOD GUIDANCE VALUES TO CLIMB TO A LOFTY 3+ INCHES OVER ALL OF OUR CWA. THEREFORE...WILL NOT ISSUE A FLASH FLOOD WATCH...BUT MENTION HEAVY RAIN /GULLYWASHERS/ POSSIBLE FROM ANY TSTORM IN ZFP AND HWO TEXT. TEMPS WILL BE CLOSE TO YESTERDAY AND DEWPOINTS WILL STAY IN THE U60S TO LOWER 70S. HAVE FOLLOWED A BLEND OF MAV AND FWC MAX TEMPS AND MAV DEWPOINTS TODAY THAT DO NOT MAKE ANY LARGE PORTION OF THE CWA OVER 100F HEAT INDICIES THIS AFTERNOON. WILL JUST CONTINUE TO MENTION HAZY...HOT AND HUMID IN THE ZFP TEXT...AND NOT ISSUE A HEAT ADVISORY AT THIS TIME. && .SHORT TERM /8 PM THIS EVENING THROUGH FRIDAY NIGHT/... SFC COLD FRONT MOVES THROUGH THE GRT LKS AND APPROACHES FROM THE NORTHWEST TONIGHT. TSTORMS SHOULD BE ONGOING ACROSS THE WEST/NORTH AT LEAST DURING THE EVENING...BUT WE WILL PROABLY LOSE LOTS OF THE FORCING WITH LOSS OF HEATING AND WILL REDUCE POPS A BIT AFT MIDNIGHT IN THE SE HALF OF THE AREA. THURSDAY LOOKS LIKE IT WILL BE THE MOST ACTIVE PERIOD FOR US...AS THE FRONT WILL BE MOVING THROUGH DURING THE DAYTIME...AND THE SHEAR WILL BE MUCH HIGHER. WILL PLACE A MENTION OF HEAVY RAIN AND GUSTY WINDS POSSIBLE INTO THE WORDED FCSTS...MAINLY OVER MY SOUTHERN HALF...AND NUDGE EVERYONE UP TO LIKELY POPS. NEWEST HPC QPF GUID PLACES 1-1.5 INCHES OF RAIN OVER THE SOUTHERN HALF OF THE CWA. THIS WOULD BE WELCOME RAINFALL IN MOST PLACES...AS THIS DAILY PULSE STUFF IS MISSING MOST. FROPA TIMING STILL LOOKS LIKE IT WILL BE DELAYED A BIT LATER THAN PREV THINKING HAD IT...AS THE SLOW PASSAGE TREND CONTINUES. BASED ON THE LATEST MODEL/ENSEMBLE GUID...THE FRONT SHOULD BE ON OUR SOUTHERN BORDER THURSDAY EVENING. THE FRONT SLOWLY SAGS SWD THROUGH THE STATE THURSDAY NIGHT...BUT A WAVE COULD DEVELOP TO OUR SOUTHWEST AND FURTHER SLOW A SIGNIFICANT SOUTHWARD PUSH UNTIL FRIDAY. WILL LINGER POPS IN THE SOUTH A BIT LONGER ON FRIDAY...BUT THE NORTHERN HALF TO TWO-THIRDS OF THE AREA SHOULD BE DRY FRIDAY AND ALL PRECIP IN SOUTH-CENTRAL PA SHOULD BE OVER BY LATE FRIDAY EVENING. && .LONG TERM /SATURDAY THROUGH WEDNESDAY/... MUCH COOLER AND DRIER AIR WILL ACCOMPANY HIGH PRESSURE AS IT MOVES SEWD OUT OF CANADA AND INTO THE REGION IN THE WAKE OF THE COLD FRONT. THE TRULY CP AIRMASS WILL TRANSLATE INTO MAX TEMPS COOLER THAN CLIMO. AS THE HIGH GRADUALLY SHIFTS OFFSHORE BY EARLY NEXT WEEK...ENSUING WARM ADV REGIME WILL ALLOW TEMPERATURES TO REBOUND BACK TOWARD MORE SEASONABLE READINGS. UPPER LEVEL PATTERN TRANSITIONS TO A PREDOMINANT NWLY FLOW WITH EMBEDDED S/W DISTURBANCES DIVING SEWD ACROSS THE UPPER MIDWEST. WILL CONTINUE TO KEEP LATER PDS DRY GIVEN LOW PREDICTABILITY OF THE LARGE SCALE FLOW. OVERALL...NOT MANY CHANGES LONG TERM AND HAVE BLENDED LATEST GMOS/HPC GUID WITH PREVIOUS FCAST. && .AVIATION /18Z WEDNESDAY THROUGH MONDAY/... WIDESPREAD MVFR CONDITIONS EXPECTED EARLY THIS AM DUE TO FOG AND HAZE. SOME POCKETS OF IFR...AS THERE WAS SOME YESTERDAY AND DEWPOINTS EVEN HIGHER NOW. A FEW SHOWERS AND STORMS TODAY...MAINLY DUE TO HEATING. FRONT WELL TO THE NW. MOST OF THE DAY WILL BE MVFR CONDITIONS DUE TO HZ. FRONT WILL NEAR TONIGHT...EXPECT A LOT OF MID LEVEL CLDS AND SOME LOWER CLDS DUE TO SHOWERS AND STORMS. LOOKING AT MVFR AND IFR CONDITIONS. FRONT WILL MOVE SOUTHWARD ON THU...SOME SHOWERS AND STORMS A GOOD BET. IF WE GET LITTLE RAIN...THEN IT MAY BE THE MIDDLE OF NEXT WEEK UNTIL WE HAVE ANOTHER DECENT CHANCE OF RAIN. WE ARE GETTING TO THE TIME OF THE YEAR...WHERE IT IS HARD TO GET FRONTS TO MOVE VERY FAR SOUTH OF THE THE M/D LINE. IN THIS CASE...THINK WILL SLOW WITH WEAK WAVES ALONG IT...BUT SHOULD BE ABLE TO CLEAR THINGS OUT FRIDAY NIGHT...WITH COOLER AND BREEZY CONDITIONS THIS WEEKEND. WITH DRY AIR MOVING IN...FRIDAY NIGHT INTO SUNDAY SHOULD FEATURE VFR CONDITIONS. && .CTP WATCHES/WARNINGS/ADVISORIES... HEAT ADVISORY UNTIL 6 PM EDT THIS AFTERNOON FOR PAZ028-035-036- 046-049>053-056>059-063>066. && SYNOPSIS...DANGELO/STEINBUGL NEAR TERM...DANGELO/LAMBERT/STEINBUGL SHORT TERM...DANGELO LONG TERM...STEINBUGL AVIATION...MARTIN
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA 112 PM EDT WED JUN 27 2007 PAZ004>006-010>012-017>019-024>027-033-034-037-041-042-045-281715- WARREN-MCKEAN-POTTER-ELK-CAMERON-NORTHERN CLINTON-CLEARFIELD- NORTHERN CENTRE-SOUTHERN CENTRE-CAMBRIA-BLAIR-HUNTINGDON-MIFFLIN- SOMERSET-BEDFORD-TIOGA-NORTHERN LYCOMING-SULLIVAN-SOUTHERN CLINTON- 112 PM EDT WED JUN 27 2007 ...SEVERE THUNDERSTORM WATCH 456 IN EFFECT UNTIL 8 PM EDT THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL PENNSYLVANIA. .DAY ONE...THIS AFTERNOON AND TONIGHT PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV/STATECOLLEGE ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. SEVERE THUNDERSTORM WATCH. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ON THURSDAY. A COLD FRONT WILL PUSH THROUGH THE REGION ON THURSDAY...TRIGGERING THUNDERSTORMS WHICH COULD CONTAIN VERY HEAVY RAIN...DAMAGING WIND GUSTS...OR LARGE HAIL. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED THIS AFTERNOON AND EVENING. PAZ028-035-036-046-049>053-056>059-063>066-281715- JUNIATA-FULTON-FRANKLIN-SOUTHERN LYCOMING-UNION-SNYDER-MONTOUR- NORTHUMBERLAND-COLUMBIA-PERRY-DAUPHIN-SCHUYLKILL-LEBANON-CUMBERLAND- ADAMS-YORK-LANCASTER- 112 PM EDT WED JUN 27 2007 ...SEVERE THUNDERSTORM WATCH 456 IN EFFECT UNTIL 8 PM EDT THIS EVENING... ...HEAT ADVISORY IN EFFECT UNTIL 6 PM EDT THIS AFTERNOON... THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTH CENTRAL PENNSYLVANIA AND THE MIDDLE AND LOWER SUSQUEHANNA VALLEY. .DAY ONE...THIS AFTERNOON AND TONIGHT PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV/STATECOLLEGE ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. SEVERE THUNDERSTORM WATCH. HEAT ADVISORY. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ON THURSDAY. A COLD FRONT WILL PUSH THROUGH THE REGION ON THURSDAY...TRIGGERING THUNDERSTORMS WHICH COULD CONTAIN VERY HEAVY RAIN...DAMAGING WIND GUSTS...OR LARGE HAIL. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL LIKELY BE NEEDED THIS AFTERNOON AND EVENING. STEINBUGL/LAMBERT
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE STATE COLLEGE PA 1241 PM EDT WED JUN 27 2007 PAZ049-051>053-271745- COLUMBIA-MONTOUR-NORTHUMBERLAND-UNION- 1241 PM EDT WED JUN 27 2007 ...STRONG THUNDERSTORMS WILL AFFECT MONTOUR...NORTHERN COLUMBIA...NORTHERN NORTHUMBERLAND AND EASTERN UNION COUNTIES... AT 1236 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 11 MILES NORTHEAST OF MILTON TO LEWISBURG...MOVING EAST AT 15 MPH. WIND GUSTS TO 50 MPH AND SMALL HAIL ARE POSSIBLE WITH THESE STORMS. EXPECT INTENSE LIGHTNING FROM THESE STORMS. DO NOT SEEK SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN A THUNDERSTORM APPROACHES. THESE STORMS WILL BE NEAR WASHINGTONVILLE AROUND 1255 PM...JERSEYTOWN AROUND 100 PM...MOORESBURG AROUND 105 PM...MILLVILLE AROUND 110 PM... RIVERSIDE AROUND 120 PM AND DANVILLE AROUND 125 PM. THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES... I-80 BETWEEN MILE MARKERS 196 AND 234...I-180 BETWEEN MILE MARKERS 1 AND 6. THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...STATE HIGHWAY 147...ROUTE 11...ROUTE 15...STATE ROAD 45. FORECASTER: LAMBERT
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE STATE COLLEGE PA 101 PM EDT WED JUN 27 2007 PAZ036-063-064-271800- ADAMS-CUMBERLAND-FRANKLIN- 101 PM EDT WED JUN 27 2007 ...STRONG THUNDERSTORMS WILL AFFECT ADAMS...SOUTHEASTERN FRANKLIN AND SOUTHWESTERN CUMBERLAND COUNTIES THROUGH 2 PM EDT... AT 1252 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 6 MILES NORTHEAST OF SHIPPENSBURG TO 3 MILES SOUTHWEST OF SHIPPENSBURG TO WAYNESBORO... MOVING EAST AT 25 MPH. WIND GUSTS TO 50 MPH AND SMALL HAIL ARE POSSIBLE WITH THESE STORMS. VERY HEAVY RAIN WILL FALL FROM THESE STORMS...AND WILL CAUSE WATER TO POND ON ROADS AND QUICKLY FILL ROADSIDE DITCHES AND SMALL STREAMS. EXPECT INTENSE LIGHTNING FROM THESE STORMS. DO NOT SEEK SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN A THUNDERSTORM APPROACHES. THESE STORMS WILL BE NEAR FAIRFIELD...CARROLL VALLEY AROUND 115 PM... PINE GROVE FURNACE STATE...CASHTOWN AROUND 120 PM...ARENDTSVILLE AROUND 125 PM...SEVEN STARS...BIGLERVILLE...BENDERSVILLE AROUND 130 PM...GETTYSBURG AROUND 135 PM AND YORK SPRINGS AROUND 145 PM. THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES... I-81 BETWEEN MILE MARKERS 14 AND 34. THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 11...ROUTE 15...ROUTE 30...STATE ROAD 97. FORECASTER: LAMBERT
The national radar mosaic for the moment the first event began.
31 thunderstorm wind, 1 hail. Local standard time, as filed.
Columbia county emergency manager reported numerous large trees down on the west side of Berwick.
Perry county emergency manager reported numerous large trees and wires down in Duncannon.
Law enforcement reported trees and limbs down in Genesee Township.
Tioga county emergency manager reported trees down on Route 15 near Lawrenceville.
Lebanon county emergency manager reported trees down just southwest of the city of Lebanon.
Lebanon county emergency manager reported numerous large trees and wires down in the city of Lebanon.
Tioga county emergency manager reported a large tree down on an elderly care facility in Lawrenceville.
Clearfield county emergency manager reported trees and wires down across the Greenville Pike a few miles northwest of Curwensville.
CO-OP observer reported numerous trees and power lines down in the city of Huntingdon.
Northumberland county emergency manager reported wind damage to portions of a roof of a large warehouse in Watsontown. The wind damage was confined to warehouse #2 of Moran Industries where two large portions of the roof were lifted. One portion crashed into a parking lot, knocking down wires and damaging a truck.
Union county emergency manager reported several small trees and large limbs down in the Lewisburg area.
PennDot reported numerous trees down.
Law enforcement reported trees and wires down in Duncansville.
Law enforcement reported trees and wires down in Hollidaysburg.
Law enforcement reported trees and wires down in Lakemont.
Law enforcement reported numerous trees down in West Hemlock Township.
Law enforcement reported trees and wires down in Tipton.
PennDot reported numerous trees down near Bloomsburg.
Mifflin county emergency manager reported numerous large trees down near Milroy.
Law enforcement reported multiple trees down near Windber.
Cambria county emergency manager reported numerous large trees down near Geistown.
Law enforcement reported trees down just east of Hollidaysburg.
Northumberland emergency manager reported trees down on wires near Mount Carmel.
Law enforcement reported multiple trees down in Penn and Franklin Townships.
Law enforcement reported 6 trees down in the city of Johnstown.
Schuylkill county emergency manager reported numerous large trees down in the city of Ashland.
Trained spotter reported penny sized hail in Shamokin.
Huntingdon county emergency manager reported trees and wires down across the Borough of Huntingdon.
Montour county emergency manager reported numerous large trees down near Danville.
Law enforcement reported tree damage in Barry, Butler, Cline, and Mahanoy Townships.
Lancaster county emergency manager reported wires and trees down near Drumore and Bethel.
TV media reported trees and power lines down in Manor Township near Millersville.
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: 32856, 32858, 32859, 32860, 32861, 32862, 32864, 32865, 32866, 32868, 32871, 32873, 32874, 32876, 32877, 32878, 32879, 32880, 32881, 32882, 32883, 32884, 32885, 32886, 32887, 32888, 32855, 32889, 32890, 32891, 32892, 32893.