Severe thunderstorms produced significant wind damage and isolated one-inch diameter hail across portions of the lower Susquehanna Valley during the late afternoon and evening.
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 produced significant wind damage and isolated one-inch diameter hail across portions of the lower Susquehanna Valley during the late afternoon and evening.
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 4, 3:05 PM EST, 0 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 405 PM EDT FRI JUN 4 2010 .SYNOPSIS... A FRONTAL BOUNDARY WILL MOVE NORTH OF PA EARLY THIS EVENING... THEN BACK SOUTHWARD ON SAT. LOW PRESSURE WILL FORM ON THE FRONT LATE SATURDAY...AND PULL A STRONG COLD FRONT ACROSS THE STATE ON SUNDAY. STRONG TO SEVERE STORMS WILL BE POSSIBLE TODAY INTO SUNDAY...ESPECIALLY ON SUNDAY. BY MONDAY...AN UPPER LEVEL TROUGH WILL MOVE OVER THE REGION... BRINGING COOLER AND GENERALLY DRY CONDITIONS TO THE AREA FOR MUCH OF NEXT WEEK. && .NEAR TERM /UNTIL 6 AM SATURDAY MORNING/... HIGH-CAPE/LOW-MOD SHEAR ENVIRONMENT OVER THE SRN HALF OF THE AREA HAS DEVELOPED FIRST AS EXPECTED. SPC HAS EXPANDED THE SLIGHT RISK TO COVER ALL THE CWA. SWOMCD HAS INDICATED WATCH LIKELIHOOD SOON IN THE SOUTH AND WW254 IS ALREADY UP TO OUR WRN BORDER. THE STORMS IN THE SOUTH WILL MAINLY BE PULSE CELLS WITH WIND DAMAGE AND HAIL POSSIBLE OUT OF THE TALLER CELLS. S/WV MOVING THRU THE UPPER GLKS STILL ON TRACK TO PROVIDE ENHANCEMENT TO THE WEAKER CAPE OVER THE N THIS EVENING AND EARLY TONIGHT. THE HIGHER SHEAR IN THE NORTH WILL ALLOW FOR ORGANIZATION INTO MULTI CELLS CLUSTERS WITH BOW ECHOES AND HAIL AS WELL. WITH THE NRN MTS IN CLOSER PROXIMITY TO THE WEAK AND DIFFUSE WARM FRONT THIS COULD ALLOW FOR SLIGHT INCREASE IN LLVL HELICTY AND COULD MAKE A TOR...BUT ONLY A REMOTE POSS THERE. WILL KEEP POPS HIGH DESPITE THE MORE SCT NATURE OF THE STORMS IN THE S...AND MAKE THE POPS A BIT HIGHER /CATG/ IN THE N. WILL LOWER POPS SIG - ESP IN THE S - AFTER MIDNIGHT. TEMPS WILL BE VERY WARM OVERNIGHT WITH DEWPOINTS STAYING IN THE 60S FOR THE MOST PART...EVEN HANGING AROUND 70F IN THE SE. && .SHORT TERM /6 AM SATURDAY MORNING THROUGH SATURDAY NIGHT/... MODELS NOW KEEP THE FRONT SOMEWHERE OVERHEAD OR JUST TO THE NORTH THROUGH THE ENTIRE SHORT TERM PD. THIS WILL KEEP US IN THE WARM SECTOR AND THE APPCH AND PASSAGE OF SIGNIFICANT S/WV TROF LATE SAT WILL FIRE MORE TSRA...AND SLIGHT RISK ALSO IN EFFECT FOR THE REGION SAT. EXPECT LOWER AVAILABLE ENERGY ON SAT - MAINLY 1000J/KG ON THE TOP END DUE TO CLOUD COVER...BUT MUCH GREATER SHEAR EXPECTED AS THE WAVE ROLLS THRU. HIGH POPS ON ORDER FOR LATER SAT AND ALL SAT NIGHT AS COVG OF THE STORMS WILL BE PRETTY WIDESPREAD. MAXES WILL BE A FEW DEGS F COOLER ON SAT THAN TODAY...AGAIN BECAUSE OF THE CLOUD COVER. SAT NIGHT WILL BE ANOTHER MUGGY ONE. && .LONG TERM /SUNDAY THROUGH FRIDAY/... DID UP POPS SOME FOR SUNDAY. STILL A LOT OF SPREAD ON THE TIMING OF THE FRONT FOR SUNDAY...AND THE INTENSITY AND TRACK OF THE SFC LOW. I ALSO DID EDGE UP MAX TEMPS SOME ON SUNDAY. POTENTIAL FOR A WIDESPREAD SEVERE WEATHER EVENT ON SUNDAY... GIVEN SUCH STRONG WIND FIELDS FOR EARLY JUNE. COOLER AND DRIER WEATHER FOR MOST OF THE PERIOD. A SMALL CHC OF SHOWERS AT MID WEEK...AS A WEAK UPPER LEVEL SYSTEM SWINGS ACROSS THE AREA. A WARM UP POSSIBLE TOWARD NEXT WEEKEND. DID NOT MAKE A LOT OF CHANGES TO THE PACKAGE...BUT DID UP TEMPS SOME HERE AND THERE. WILL SPEND THE NEXT FEW HOURS LOOKING AT STORMS...SEVERE WATCH 255 IN EFFECT FOR MUCH OF CENTRAL PA...EXCLUDING THE FAR NORTH...UNTIL 10 PM. MAINLY PULSE STORMS SO FAR. && .AVIATION /20Z FRIDAY THROUGH WEDNESDAY/... AS HAS BEEN THE CASE THIS WEEK...SCT TO NMRS SHRA/TSRA WILL POP UP THROUGHOUT THE REGION THIS AFTERNOON AND SPREAD FROM SW TO NE...WHICH WILL ONCE AGAIN LEAD TO TEMPORARY INTERRUPTION OF WIDESPREAD VFR TO IFR/MVFR CONDITIONS. IT APPEARS MAJORITY OF ACTION WILL BE IN THE SOUTH...AT LEAST DURING THE EARLY AFTERNOON...AND HENCE INCLUDED TEMPO IFR/MVFR FOR KJST...KAOO...AND KMDT. SCT SHRA/TSRA WILL CONTINUE IN THE EVENING...EVENTUALLY TAPERING OVERNIGHT. ONCE AGAIN THERE IS A THREAT FOR MVFR/IFR CIGS TO DEVELOP LATE...AND THEN LIFT AGAIN JUST IN TIME FOR ANOTHER ROUND OF SHRA/TSRA SATURDAY. OUTLOOK... SAT...VFR WITH LOCAL RESTRICTIONS IN SCT SHRA/TSRA. SUN...PROLONGED MVFR/IFR PSBL WEST-CENTRAL SXNS. MON-TUE...MAINLY VFR. WED...VFR WITH LOCAL RESTRICITION IS SCT SHRA/TSRA && .CTP WATCHES/WARNINGS/ADVISORIES... NONE. && SYNOPSIS...LAMBERT/MARTIN NEAR TERM...DANGELO SHORT TERM...DANGELO LONG TERM...MARTIN AVIATION...DANGELO/DICKEY
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA 243 PM EDT FRI JUN 4 2010 PAZ004>006-010>012-037-041-042-045-046-051-053-051845- WARREN-MCKEAN-POTTER-ELK-CAMERON-NORTHERN CLINTON-TIOGA- NORTHERN LYCOMING-SULLIVAN-SOUTHERN CLINTON-SOUTHERN LYCOMING- MONTOUR-COLUMBIA- 243 PM EDT FRI JUN 4 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...THIS AFTERNOON AND TONIGHT. STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE OVER THE REGION THIS AFTERNOON AND TONIGHT. SOME HAIL IS POSSIBLE...BUT DAMAGING WIND GUSTS ARE THE MOST LIKELY THREAT. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. SEVERE THUNDERSTORMS ARE POSSIBLE AGAIN ON SATURDAY AFTERNOON AND NIGHT. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. PAZ017>019-024>028-033>036-049-050-052-056>059-063>066-051845- CLEARFIELD-NORTHERN CENTRE-SOUTHERN CENTRE-CAMBRIA-BLAIR-HUNTINGDON- MIFFLIN-JUNIATA-SOMERSET-BEDFORD-FULTON-FRANKLIN-UNION-SNYDER- NORTHUMBERLAND-PERRY-DAUPHIN-SCHUYLKILL-LEBANON-CUMBERLAND-ADAMS- YORK-LANCASTER- 243 PM EDT FRI JUN 4 2010 ...SEVERE THUNDERSTORM WATCH 255 IN EFFECT UNTIL 10 PM EDT THIS EVENING... THIS HAZARDOUS WEATHER OUTLOOK IS FOR 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...SATURDAY THROUGH THURSDAY. SEVERE THUNDERSTORMS ARE POSSIBLE AGAIN ON SATURDAY AFTERNOON AND NIGHT. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. DANGELO
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
136 PM EDT FRI JUN 4 2010
PAZ035-036-041815-
FRANKLIN PA-FULTON PA-
136 PM EDT FRI JUN 4 2010
...A STRONG THUNDERSTORM WILL AFFECT SOUTHERN FRANKLIN AND SOUTHERN
FULTON COUNTIES...
AT 125 PM EDT...A STRONG THUNDERSTORM WAS 13 MILES SOUTHEAST OF
BREEZEWOOD...MOVING EAST AT 20 MPH.
WIND GUSTS TO 40 MPH AND PENNY SIZE HAIL ARE POSSIBLE WITH THIS
STORM. VERY HEAVY RAIN WILL FALL FROM THIS STORM...AND WILL CAUSE
WATER TO POND ON ROADS AND FILL POOR DRAINAGE AREAS. THE RAIN WILL
CAUSE RAPID RISES ON SMALL STREAMS AND CREEKS. THIS STORM WILL BE
NEAR MERCERSBURG AROUND 150 PM AND GREENCASTLE AROUND 220 PM.
THIS WILL IMPACT I-81 BETWEEN MILE MARKERS 1 AND 15.
THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 11...ROUTE
30...ROUTE 522.
LAT...LON 3975 7815 3993 7813 3992 7759 3972 7761
3972 7788
FORECASTER: RHGSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
223 PM EDT FRI JUN 4 2010
PAZ036-041900-
FRANKLIN PA-
223 PM EDT FRI JUN 4 2010
...A STRONG THUNDERSTORM WILL AFFECT SOUTHERN FRANKLIN COUNTY...
AT 222 PM EDT...A STRONG THUNDERSTORM WAS NEAR GREENCASTLE...MOVING
EAST AT 25 MPH.
WIND GUSTS TO 50 MPH AND PENNY SIZE HAIL ARE POSSIBLE WITH THIS
STORM. THIS STORM WILL BE NEAR GREENCASTLE AROUND 240 PM...MARION
AROUND 250 PM AND WAYNESBORO AROUND 300 PM.
THIS WILL IMPACT I-81 BETWEEN MILE MARKERS 1 AND 10.
THIS WILL ALSO IMPACT ROUTE 11.
LAT...LON 3974 7802 3991 7796 3984 7747 3972 7751
3972 7792
FORECASTER: RHGSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
228 PM EDT FRI JUN 4 2010
PAZ026-028-036-056-063-041900-
CUMBERLAND PA-FRANKLIN PA-HUNTINGDON PA-JUNIATA PA-PERRY PA-
228 PM EDT FRI JUN 4 2010
...A STRONG THUNDERSTORM WILL AFFECT EAST CENTRAL HUNTINGDON...NORTH
CENTRAL FRANKLIN...NORTHWESTERN CUMBERLAND...SOUTHWESTERN JUNIATA AND
SOUTHWESTERN PERRY COUNTIES...
AT 226 PM EDT...A STRONG THUNDERSTORM WAS 16 MILES SOUTHEAST OF
HUNTINGDON...MOVING EAST AT 30 MPH.
WIND GUSTS TO 40 MPH AND PEA SIZE HAIL ARE POSSIBLE WITH THIS STORM.
THIS STORM WILL BE NEAR DOYLESBURG AROUND 240 PM...BIG SPRING STATE
PARK AROUND 250 PM AND COLONEL DENNING STATE PARK AROUND 300 PM.
THIS WILL IMPACT THE PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 204
AND 213.
THIS WILL ALSO IMPACT ROUTE 522.
LAT...LON 4022 7798 4040 7795 4039 7786 4038 7786
4037 7784 4037 7776 4039 7775 4037 7737
4015 7741
FORECASTER: RHGSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
250 PM EDT FRI JUN 4 2010
PAZ065-066-041915-
LANCASTER PA-YORK PA-
250 PM EDT FRI JUN 4 2010
...A STRONG THUNDERSTORM WILL AFFECT SOUTH CENTRAL LANCASTER AND
SOUTHEASTERN YORK COUNTIES...
AT 245 PM EDT...A STRONG THUNDERSTORM WAS 13 MILES SOUTHEAST OF RED
LION...MOVING EAST AT 30 MPH.
WIND GUSTS TO 50 MPH AND PENNY SIZE HAIL ARE POSSIBLE WITH THIS
STORM. THIS STORM WILL BE NEAR WAKEFIELD AROUND 310 PM.
THIS WILL IMPACT ROUTE 222.
LAT...LON 3974 7649 3992 7643 3985 7603 3984 7602
3978 7606 3973 7610 3972 7615 3971 7638
FORECASTER: RHGSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE STATE COLLEGE PA 331 PM EDT FRI JUN 4 2010 PAZ036-056-063-041945- CUMBERLAND PA-FRANKLIN PA-PERRY PA- 331 PM EDT FRI JUN 4 2010 ...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTH CENTRAL FRANKLIN...SOUTHERN PERRY AND WESTERN CUMBERLAND COUNTIES... AT 323 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM LANDISBURG TO AMBERSON VALLEY...MOVING EAST AT 15 MPH. WIND GUSTS TO 30 MPH AND SMALL HAIL ARE POSSIBLE WITH THESE STORMS. THESE STORMS WILL BE NEAR NEWBURG AROUND 340 PM AND BLOSERVILLE AROUND 350 PM. LAT...LON 4036 7699 4005 7744 4009 7779 4040 7735 FORECASTER: KF
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
341 PM EDT FRI JUN 4 2010
PAZ026-036-063-064-042030-
ADAMS PA-CUMBERLAND PA-FRANKLIN PA-HUNTINGDON PA-
341 PM EDT FRI JUN 4 2010
...A STRONG THUNDERSTORM WILL AFFECT NORTH CENTRAL ADAMS...
NORTHEASTERN FRANKLIN...SOUTHEASTERN HUNTINGDON AND SOUTHWESTERN
CUMBERLAND COUNTIES...
AT 337 PM EDT...A STRONG THUNDERSTORM WAS 20 MILES SOUTH OF
HUNTINGDON...MOVING EAST AT 40 MPH.
WIND GUSTS TO 50 MPH AND PENNY SIZE HAIL ARE POSSIBLE WITH THIS
STORM. THIS STORM WILL BE NEAR WILLOW HILL AROUND 350 PM...AMBERSON
VALLEY AROUND 400 PM...NEWBURG AROUND 410 PM...SHIPPENSBURG AROUND
420 PM AND WALNUT BOTTOM AROUND 430 PM.
THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...THE
PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 188 AND 215...I-81 BETWEEN
MILE MARKERS 24 AND 43.
THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 11...ROUTE
522.
LAT...LON 4015 7804 4032 7797 4026 7767 4024 7764
4022 7765 4023 7762 4019 7760 4023 7752
4017 7718 3993 7728
FORECASTER: STEINBUGLThe State College radar (KCCX), 109 km away, was scanning. The volume nearest the first event began at 20:04 UTC.
9 thunderstorm wind, 2 hail, 1 funnel cloud. Local standard time, as filed.
Thunderstorm winds estimated near 60 mph downed trees, wires and power poles in South Middlesex Township near Old Stonehouse/Hickory Road and Ridge Drive. Severe winds also caused minor to moderate damage to 3-4 homes in the same area.
Thunderstorm winds estimated near 60 mph downed several trees along a 2-3 mile wide area in York Haven.
Spotter reported funnel/rotating wall cloud dissipated before touching down north of Chambersburg.
Thunderstorm winds estimated near 60 mph downed trees on Sollenberger Road near Chambersburg.
Thunderstorm winds estimated near 60 mph downed trees and wires in Menallen Township near the Adams/Cumberland line.
Thunderstorm winds estimated between 70 and 80 mph tore-off a portion of the roof from the Woodside Vista apartment complex on 240 Ram Drive in Conewago Township just west of Hanover. Damaging winds also downed 8 utility poles along Route 194 near Mount Pleasant Road, causing thousands of power outages. Extensive water damage occurred at the apartment complex.
Wind-driven quarter size hail caused extensive damage to siding at the Woodlands Apartment complex on Ram Drive in Conewago Township.
Thunderstorm winds estimated near 60 mph tore the roof off of 2 outbuildings in McSherrytown.
Thunderstorm winds estimated near 60 mph downed trees and wires in Hanover.
Thunderstorm winds estimated near 60 mph downed trees and wires in West Manheim and Penn Townships southeast of Hanover.
Thunderstorm winds estimated near 60 mph downed trees and wires northeast of Walnut Bottom in Dickinson Township.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2010Every state in 2010This day in weather historyWarnings in Pennsylvania, June 2010
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: 223905, 223906, 223907, 223908, 223924, 223927, 223910, 223912, 223913, 223914, 223915, 223918.