A cold front triggered severe thunderstorms during the early to mid afternoon across the south central mountains and lower Susquehanna valley. The storms produced damaging winds and large hail up to one-inch in diameter.
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.
A cold front triggered severe thunderstorms during the early to mid afternoon across the south central mountains and lower Susquehanna valley. The storms produced damaging winds and large hail up to one-inch in diameter.
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 24, 12:39 PM EST, 6 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 139 PM EDT THU JUN 24 2010 .SYNOPSIS... A COLD FRONT WILL SWEEP ACROSS THE AREA TODAY...FOLLOWED BY CLEARING SKIES...SLIGHTLY COOLER AND MUCH LESS HUMID AIR FOR TONIGHT THROUGH MUCH OF SATURDAY. HEAT AND HUMIDITY WILL INCREASE ONCE AGAIN SUNDAY INTO MONDAY...ALONG WITH A CHANCE OF MAINLY AFTERNOON SHOWERS AND THUNDERSTORMS. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... CONVECTION IS STARTING TO FIRE AHEAD OF THE APPROACHING COLD FRONT. MESO ANAL SHOWS A STEADY INCREASE IN CAPE OVER ABOUT THE SRN 1/2 OR SO OF THE FCST AREA...ALONG WITH RAPID EROSION OF ANY CIN THAT WAS PRESENT. STRONG WINDS JUST OFF THE DECK WILL POSE THE BIGGEST THREAT AS THE STORMS MOVE INTO INCREASINGLY UNSTABLE AIR. MAIN THINGS WORKING AGAINST THE STORMS ARE MEAGER MID LEVEL LAPSE RATES AND A LACK OF LOW LEVEL CONVERGENCE AS THE WESTERLY FLOW IS CAUSING WEAK SFC RIDGING OVER CENTRAL AREAS AND LEE SIDE TROFFING OVER MY SERN ZONES. THIS WUD SEEM TO SUGGEST THE HIGHEST THREAT AREA TO EVOLVE WILL BE THE SRN AND SERN TIER COUNTIES AS THE DAY WEARS ON. A POTENT...WESTERLY 700-500 MB WIND MAX OF 45KT...AND 60 KTS RESPECTIVELY WILL TEAM WITH MDTLY STRONG COLD ADVECTION WITHIN THIS LAYER TO READILY MIX DOWN WIND GUSTS OF 45 MPH WITHIN THE STRONGER TSRA/REFLECTIVITY CORES. SPC HAS MAINTAINED THEIR SLIGHT RISK AREA FOR MUCH OF CENTRAL AND EASTERN PA. MAX TEMPS TDY WILL RANGE FROM THE MID 70S TO NEAR 80 ACROSS THE NRN MTNS...TO THE STEAMY LOWER-MID 90S IN THE LOWER SUSQ VALLEY. && .SHORT TERM /6 PM THIS EVENING THROUGH FRIDAY NIGHT/... SKIES CLEAR OUT AND WINDS DIMINISH LATER TODAY AND TONIGHT AS HIGH PRESSURE /1022 MB/ BUILDS EAST FROM THE MIDDLE AND UPPER MISSISSIPPI RIVER VALLEY. THOUGH TEMPS WILL BE A FEW DEG F ABOVE NORMAL /IN THE MID 70S NORTH...TO MID 80S SE/...FRIDAY WILL FEATURE PLENTY OF SUNSHINE AND MUCH LOWER HUMIDITY THAT WE/VE EXPERIENCED DURING THE PAST FEW DAYS. A QUITE COOL AND MAINLY CLEAR NIGHT IS ON TAP FOR FRIDAY NIGHT WITH LOWS ABOUT 50F ACROSS THE NRN HIGH TERRAIN...AND MID 50S TO LOWER 60S ELSEWHERE. WATER/AIR TEMP DIFF EXCEEDING 10C IN THE DEEPER VALLEYS OF CENTRAL AND NORTHERN PENN SHOULD RESULT IN AREAS OF 1/2-1SM FOG BETWEEN 07-13Z SATURDAY. && .LONG TERM /SATURDAY THROUGH THURSDAY/... WARM...BUT LESS HUMID CONDITIONS WILL PREVAIL ACROSS THE REGION SAT. ALTHOUGH MOST OF THE DAY SHOULD BE PARTLY SUNNY AND RAIN- FREE...WEAK LOW PRESSURE AT THE SURFACE AND A MID/UPR SHORT WAVE APPROACHING FROM THE UPPER MIDWEST WILL PUSH A FEW SHRA/ISOLATED TSRA INTO THE NORTH AND WEST LATER IN THE DAY INTO SATURDAY NIGHT. MORE HEAT AND HUMIDITY APPEARS IN STORE FOR ALL OF CENTRAL PENN SUNDAY AND MONDAY. WITH A CHANCE OF MAINLY AFTERNOON SHOWERS AND THUNDERSTORMS. STILL LOOKING AT DRY WEATHER AFTER TUE...WITH NW FLOW. STILL THINK MODELS OVERDOING THE PUSH OF COLD AIR AND THE UPPER LVL TROUGH BEING TOO AMPLIFIED...BUT LEFT CHC OF SHOWERS IN FOR MONDAY NIGHT AND TUE. && .AVIATION /18Z THURSDAY THROUGH TUESDAY/... COLD FRONT CROSSING THE AREA TODAY. BEST CHANCE OF THUNDERSTORMS FROM EARLY AFTERNOON THROUGH ABOUT 5 PM WILL BE SOUTH OF I-80. EXPECT GENERALLY VFR CONDITIONS...WITH BRIEF MVFR/IFR IN THE SHOWERS AND THUNDERSTORMS. BEHIND THE FRONT...SKIES WILL CLEAR TONIGHT WITH SOME AREAS OF PATCHY FOG EXPECTED...ESPECIALLY WHERE ANY KIND OF APPRECIABLE RAINS OCCUR. GUSTY NW WIND INITIALLY...WILL DIMINISH TO UNDER 10 MPH BY DARK. FRIDAY LOOKS LIKE A NICE DAY...WITH PLENTIFUL SUNSHINE AND VFR FLYING CONDITIONS. OUTLOOK... SAT...VFR. SUN-MON...MAINLY VFR WITH MVFR POSS IN SCTD SHRA/TSRA. TUE...VFR. && .CTP WATCHES/WARNINGS/ADVISORIES... NONE. && SYNOPSIS...LA CORTE NEAR TERM...LA CORTE/LAMBERT SHORT TERM...FITZGERALD/LAMBERT LONG TERM...LAMBERT/MARTIN AVIATION...LA CORTE
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA 103 PM EDT THU JUN 24 2010 PAZ004>006-010>012-017>019-024-037-041-042-045-046-251715- WARREN-MCKEAN-POTTER-ELK-CAMERON-NORTHERN CLINTON-CLEARFIELD- NORTHERN CENTRE-SOUTHERN CENTRE-CAMBRIA-TIOGA-NORTHERN LYCOMING- SULLIVAN-SOUTHERN CLINTON-SOUTHERN LYCOMING- 103 PM EDT THU JUN 24 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...THIS AFTERNOON AND TONIGHT. THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. PAZ025>028-033>036-049>053-056>058-063-251715- BLAIR-HUNTINGDON-MIFFLIN-JUNIATA-SOMERSET-BEDFORD-FULTON-FRANKLIN- UNION-SNYDER-MONTOUR-NORTHUMBERLAND-COLUMBIA-PERRY-DAUPHIN- SCHUYLKILL-CUMBERLAND- 103 PM EDT THU JUN 24 2010 ...SEVERE THUNDERSTORM WATCH 404 IN EFFECT UNTIL 6 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...FRIDAY THROUGH WEDNESDAY. THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. PAZ059-064>066-251715- LEBANON-ADAMS-YORK-LANCASTER- 103 PM EDT THU JUN 24 2010 ...SEVERE THUNDERSTORM WATCH 406 IN EFFECT UNTIL 8 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...FRIDAY THROUGH WEDNESDAY. THE PROBABILITY OF WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1010 AM EDT THU JUN 24 2010
PAZ010>012-017-018-241500-
CAMERON PA-CLEARFIELD PA-ELK PA-NORTHERN CENTRE PA-
NORTHERN CLINTON PA-
1010 AM EDT THU JUN 24 2010
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHERN CLEARFIELD...
NORTHWESTERN CENTRE...SOUTHERN CAMERON...SOUTHERN ELK AND WEST
CENTRAL CLINTON COUNTIES...
AT 1009 AM EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM
SIGEL TO BROOKVILLE...MOVING EAST AT 60 MPH.
WIND GUSTS OF 40 TO 50 MPH ARE POSSIBLE WITH THESE STORMS. THESE
STORMS WILL BE NEAR PORTLAND MILLS AROUND 1020 AM...RIDGWAY AROUND
1030 AM...MEDIX RUN AROUND 1040 AM...BENEZETTE AROUND 1050 AM AND
DRIFTWOOD AROUND 1100 AM.
THIS WILL IMPACT I-80 BETWEEN MILE MARKERS 97 AND 123.
THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 119...ROUTE
219...ROUTE 322...STATE ROAD 120...STATE ROAD 153...STATE ROAD 255.
LAT...LON 4143 7909 4142 7815 4123 7800 4101 7801
4102 7881 4114 7881 4120 7878 4121 7872
4123 7875 4127 7875 4137 7896 4135 7902
4135 7909 4142 7910
FORECASTER: STEINBUGLSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1059 AM EDT THU JUN 24 2010
PAZ037-041-042-241545-
NORTHERN LYCOMING PA-SULLIVAN PA-TIOGA PA-
1059 AM EDT THU JUN 24 2010
...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN LYCOMING...
NORTHWESTERN SULLIVAN AND SOUTHERN TIOGA COUNTIES...
AT 1055 AM EDT...A STRONG THUNDERSTORM WAS 13 MILES SOUTHWEST OF
WELLSBORO...MOVING EAST AT 50 MPH.
WIND GUSTS TO 40 MPH 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. THIS STORM WILL BE NEAR MORRIS AROUND 1110
AM...BLOSSBURG AROUND 1120 AM...OGDENSBURG AROUND 1130 AM...SHUNK
AROUND 1140 AM AND LINCOLN FALLS AROUND 1150 AM.
THIS WILL IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 15...STATE ROAD
14.
LAT...LON 4160 7687 4158 7664 4148 7664 4152 7755
4170 7755 4171 7689
FORECASTER: STEINBUGLSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1201 PM EDT THU JUN 24 2010
PAZ024-025-033-034-241630-
BEDFORD PA-BLAIR PA-CAMBRIA PA-SOMERSET PA-
1201 PM EDT THU JUN 24 2010
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHWESTERN BEDFORD...
SOMERSET...SOUTHERN BLAIR AND SOUTHERN CAMBRIA COUNTIES...
AT NOON EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM
WESTMONT TO MCCHESNEYTOWN-LOYA TO 21 MILES SOUTHWEST OF
CONNELLSVILLE...MOVING EAST AT 55 MPH.
WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THESE STORMS. THESE STORMS
WILL BE NEAR NANTY-GLO AROUND 1210 PM...LILLY AROUND 1220 PM AND
OGLETOWN AROUND 1230 PM.
THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...THE
PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 100 AND 121...I-99 BETWEEN
MILE MARKERS 17 AND 32.
THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...THE JOHNSTOWN
EXPRESSWAY...ROUTE 22...ROUTE 30...ROUTE 40...ROUTE 219...ROUTE
220...ROUTE 422...STATE ROAD 56.
LAT...LON 3972 7940 3974 7942 3978 7940 3980 7936
3982 7937 3985 7942 3990 7941 4008 7928
4011 7923 4012 7919 4037 7899 4051 7892
4048 7822 4017 7858 3971 7924
FORECASTER: STEINBUGLSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1236 PM EDT THU JUN 24 2010
PAZ024>026-033-034-241700-
BEDFORD PA-BLAIR PA-CAMBRIA PA-HUNTINGDON PA-SOMERSET PA-
1236 PM EDT THU JUN 24 2010
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT NORTHERN BEDFORD...
NORTHERN SOMERSET...SOUTH CENTRAL CAMBRIA...SOUTHERN BLAIR AND
SOUTHERN HUNTINGDON COUNTIES...
AT 1232 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM
PORTAGE TO 14 MILES EAST OF CONNELLSVILLE...MOVING EAST AT 45 MPH.
WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THESE STORMS. THESE STORMS
WILL BE NEAR MARTINSBURG AROUND 1250 PM AND BERLIN AROUND 100 PM.
THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...THE
PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 103 AND 153...I-99 BETWEEN
MILE MARKERS 0 AND 23.
THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 30...ROUTE
219...ROUTE 220...ROUTE 522.
LAT...LON 3989 7941 4000 7934 4040 7865 4032 7783
4016 7813 4014 7815 3983 7870
FORECASTER: STEINBUGLSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
107 PM EDT THU JUN 24 2010
PAZ026-028-034>036-052-056>059-063-241800-
BEDFORD PA-CUMBERLAND PA-DAUPHIN PA-FRANKLIN PA-FULTON PA-
HUNTINGDON PA-JUNIATA PA-LEBANON PA-NORTHUMBERLAND PA-PERRY PA-
SCHUYLKILL PA-
107 PM EDT THU JUN 24 2010
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT DAUPHIN...LEBANON...
NORTHEASTERN FULTON...NORTHERN BEDFORD...NORTHERN CUMBERLAND...
NORTHERN FRANKLIN...PERRY...SCHUYLKILL...SOUTHEASTERN
NORTHUMBERLAND...SOUTHERN HUNTINGDON AND SOUTHWESTERN JUNIATA
COUNTIES...
AT 104 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM
KULPMONT TO 15 MILES NORTH OF CARLISLE TO WINDBER...MOVING EAST AT 45
MPH.
WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THESE STORMS. THESE STORMS
WILL BE NEAR GORDON AROUND 115 PM...ST. CLAIR AROUND 130 PM...
ORWIGSBURG AROUND 145 PM AND WORMLEYSBURG AROUND 200 PM.
THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...THE
PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 171 AND 232...I-78 BETWEEN
MILE MARKERS 0 AND 8...I-81 BETWEEN MILE MARKERS 40 AND 121...I-83
BETWEEN MILE MARKERS 41 AND 50...I-99 BETWEEN MILE MARKERS 2 AND 9.
THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...THE HARRISBURG
EXPRESSWAY...ROUTE 11...ROUTE 11/15...ROUTE 15...ROUTE 22...ROUTE
209...ROUTE 220...ROUTE 322...ROUTE 322/22...ROUTE 422...ROUTE 522...
STATE ROAD 61...STATE ROAD 309...STATE ROAD 501.
LAT...LON 4064 7599 4058 7602 4058 7607 4053 7618
4049 7642 4036 7624 4034 7629 4003 7791
4009 7872 4014 7870 4043 7725 4078 7645
4073 7581
FORECASTER: STEINBUGLSPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE STATE COLLEGE PA 109 PM EDT THU JUN 24 2010 PAZ026-033>035-241800- BEDFORD PA-FULTON PA-HUNTINGDON PA-SOMERSET PA- 109 PM EDT THU JUN 24 2010 ...STRONG THUNDERSTORMS WILL AFFECT BEDFORD...NORTHERN FULTON... SOUTHEASTERN SOMERSET AND SOUTHERN HUNTINGDON COUNTIES... AN AREA OF STRONG THUNDERSTORMS COVERED PORTIONS OF BEDFORD... FULTON...HUNTINGDON AND SOMERSET COUNTIES AT 104 PM EDT. THE STRONG THUNDERSTORMS WERE GENERALLY MOVING EAST AT 35 MPH. WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THESE STRONG THUNDERSTORMS. THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...THE PENNSYLVANIA TURNPIKE BETWEEN MILE MARKERS 118 AND 183...I-70 BETWEEN MILE MARKERS 147 AND 160...I-99 BETWEEN MILE MARKERS 0 AND 10. THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 30...ROUTE 40...ROUTE 219...ROUTE 220...ROUTE 522. LAT...LON 3972 7934 4021 7863 4012 7783 3972 7842 FORECASTER: STEINBUGL
The State College radar (KCCX), 98 km away, was scanning. The volume nearest the first event began at 17:45 UTC.
15 thunderstorm wind, 1 hail. Local standard time, as filed.
Thunderstorm winds estimated near 60 mph toppled trees and wires in Fannettsburg.
Thunderstorm winds estimated near 60 mph toppled trees in Stover Dam.
Thunderstorm winds estimated near 60 mph toppled numerous large trees and wires in Jonestown.
Thunderstorm winds estimated near 60 mph downed trees in Carlisle.
Thunderstorm winds estimated near 60 mph toppled trees and wires in Lebanon.
Thunderstorm winds estimated near 60 mph toppled numerous trees and wires near Boiling Springs.
Thunderstorm winds estimated near 60 mph downed several trees near Kleinfeltersville.
Thunderstorm winds estimated near 60 mph toppled trees near the Mount Hope exit on the Pennsylvania Turnpike.
Thunderstorm winds estimated near 60 mph peeled a sheet metal roof from a house near Terre Hill.
Thunderstorm wind gust measured between 60 and 70 mph on top of the WGAL building.
Thunderstorm winds estimated near 60 mph toppled trees near Terre Hill.
Thunderstorm winds estimated near 60 mph toppled trees and wires in Springettsbury Township.
Thunderstorm winds estimated near 60 mph toppled trees and wires in Dover.
Thunderstorm winds estimated near 60 mph toppled trees and wires in Manheim 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: 227847, 227854, 227845, 227860, 227869, 227851, 227868, 227852, 227870, 227853, 227865, 227856, 227866, 227857, 227858, 227859.