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| Severe Weather of September 22nd |
A cold front pressed southward through the state on Wednesday, the 22nd of September, 2010. Ahead of the cold front, numerous thunderstorms formed in the unseasonably warm and humid air over the state. Many of these thunderstorms produced damaging wind gusts and hail.
A long-lived thunderstorm cell tracked from west of Du Bois, PA, through Berwick, PA. The cell started as a supercell - a violently rotating thunderstorm. It produced wind damage and large hail over Jefferson County (west of Du Bois) and then moved into western Clearfield County around 3 PM EDT. It then moved across all of Central PA along and just to the north of I-80. Along the way, the storm turned into a bow-echo, a thunderstorm that races forward - usually producing very strong wind gusts. The winds from these bow-echoes can be as fast and as damaging as a weak tornado.
As the bow-echo pushed through Williamsport, PA, and Southern Lycoming County, it continued to intensify, producing a 60 mph wind gust at the Williamsport Regional Airport in Montoursville, PA.
It produced the most concentrated and severe damage in the town of Muncy, where it toppled many trees, power lines and damaged some structures. Two people died in Muncy around 445 PM EDT when a large tree fell on their vehicle.
A Storm Damage Survey was conducted in Muncy on the afternoon of the 23rd to determine the cause of the high winds. It was determined that a thunderstorm microburst was the cause. See the survey report here.
Many more intense thunderstorms also produced damage across the rest of Central PA, especially in the Laurel Highlands and in the Southeastern Piedmont/lower Susquehanna Valley. Power outages were common as the trees fell on power lines.
See a map of the locations of preliminary damage reports.
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Here is a text listing of those preliminary reports:
PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE STATE COLLEGE PA
916 PM EDT WED SEP 22 2010
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0248 PM TSTM WND DMG PENFIELD 41.21N 78.60W
09/22/2010 CLEARFIELD PA EMERGENCY MNGR
TREES DOWN ON STATE PARK ROAD BLOCKING BOTH LANES BY
PARKER DAM
0339 PM TSTM WND DMG 3 S CARLISLE 40.16N 77.20W
09/22/2010 CUMBERLAND PA EMERGENCY MNGR
TREES AND WIRES DOWN ON LEIBIGH DRIVE IN SOUTH MIDDLETOWN
TWP.
0354 PM TSTM WND DMG LOCK HAVEN 41.14N 77.45W
09/22/2010 CLINTON PA LAW ENFORCEMENT
NUMEROUS TREES AND WIRES REPORTED DOWN AROUND LOCK HAVEN.
0355 PM TSTM WND DMG SIDDONSBURG 40.15N 76.96W
09/22/2010 YORK PA TRAINED SPOTTER
LARGE BRANCHES DOWN IN THE VICINITY OF SIDDONSBURG.
0416 PM TSTM WND DMG JERSEY SHORE 41.20N 77.27W
09/22/2010 LYCOMING PA LAW ENFORCEMENT
TREES AND WIRES REPORTED DOWN IN JERSEY SHORE.
0418 PM TSTM WND DMG GERMANTOWN 39.77N 77.16W
09/22/2010 ADAMS PA EMERGENCY MNGR
TREES DOWN
0428 PM TSTM WND DMG MANCHESTER 40.06N 76.72W
09/22/2010 YORK PA LAW ENFORCEMENT
SCATTERED REPORTS OF TREES AND WIRES DOWN ACROSS YORK
COUNTY.
0430 PM TSTM WND DMG 1 W WILLIAMSPORT 41.24N 77.04W
09/22/2010 LYCOMING PA TRAINED SPOTTER
TREES REPORTED DOWN ON THE WEST-SIDE OF WILLIAMSPORT.
0435 PM TSTM WND DMG 2 N WATSONTOWN 41.11N 76.86W
09/22/2010 NORTHUMBERLAND PA TRAINED SPOTTER
TREES DOWN ON RIVER ROAD NEAR DEWART.
0439 PM TSTM WND DMG MUNCY 41.20N 76.79W
09/22/2010 LYCOMING PA TRAINED SPOTTER
TREES AND WIRES REPORTED DOWN IN MUNCY...ALONG WITH
DIME-SIZED HAIL. SPOTTER REPORTED 67 MPH WIND GUST ON A
DAVIS WEATHER STATION.
0452 PM TSTM WND DMG JERSEYTOWN 41.09N 76.60W
09/22/2010 COLUMBIA PA LAW ENFORCEMENT
TREES REPORTED DOWN IN JERSEYTOWN.
0512 PM TSTM WND DMG FAWN GROVE 39.73N 76.45W
09/22/2010 YORK PA TRAINED SPOTTER
TREES AND POWER LINES DOWN IN FAWN GROVE AND SUNNYBURN.
0513 PM TSTM WND DMG BERWICK 41.06N 76.25W
09/22/2010 COLUMBIA PA LAW ENFORCEMENT
NUMEROUS REPORTS OF TREES DOWN AND SEVERAL ROOFS DAMAGED
ACROSS COLUMBIA COUNTY.
0516 PM HAIL 4 SW WESTMONT 40.28N 79.01W
09/22/2010 E1.00 INCH SOMERSET PA PUBLIC
ONE-INCH HAIL REPORTED ON LAUREL MTN SOUTHWEST OF
WESTMONT.
0518 PM TSTM WND DMG HOOVERSVILLE 40.15N 78.91W
09/22/2010 SOMERSET PA LAW ENFORCEMENT
TREES AND WIRES REPORTED DOWN ACROSS MUCH OF NORTHWESTERN
SOMERSET COUNTY.
0628 PM TSTM WND DMG SCHUYLKILL HAVEN 40.63N 76.17W
09/22/2010 SCHUYLKILL PA LAW ENFORCEMENT
WIDESPREAD WIND DAMAGE REPORTED ACROSS SOUTHERN
SCHUYLKILL COUNTY.
0632 PM TSTM WND DMG ST. THOMAS 39.94N 77.74W
09/22/2010 FRANKLIN PA PUBLIC
WIRES DOWN ON MAIN STREET IN ST. THOMAS.
0635 PM TSTM WND DMG CHAMBERSBURG 39.93N 77.66W
09/22/2010 FRANKLIN PA TRAINED SPOTTER
TELEPHONE POLES DOWN ALONG ROUTE 30 NEAR CHAMBERSBURG.
0642 PM TSTM WND DMG 1 W SHIPPENSBURG 40.05N 77.54W
09/22/2010 FRANKLIN PA EMERGENCY MNGR
ROOF BLOWN OFF HOUSE ON MOLLY PITCHER HIGHWAY
0645 PM TSTM WND DMG SUMMIT STATION 40.58N 76.22W
09/22/2010 SCHUYLKILL PA EMERGENCY MNGR
TREES AND UTILITY LINES DOWN IN SUMMIT STATION
0648 PM TSTM WND DMG SHIPPENSBURG 40.05N 77.52W
09/22/2010 CUMBERLAND PA EMERGENCY MNGR
NUMEROUS TREES AND POWER LINES DOWN IN TOWN
0717 PM TSTM WND DMG NEW OXFORD 39.86N 77.06W
09/22/2010 ADAMS PA EMERGENCY MNGR
MULTIPLE TREES AND WIRES DOWN ON RT 94. RT 94 IS CLOSED.
0730 PM TSTM WND DMG SPRING GROVE 39.88N 76.86W
09/22/2010 YORK PA PUBLIC
NUMEROUS REPORTS OF TREES AND WIRES DOWN ACROSS YORK
COUNTY.
0804 PM TSTM WND DMG 1 E LANDISVILLE 40.09N 76.40W
09/22/2010 LANCASTER PA LAW ENFORCEMENT
TREES AND WIRES REPORTED DOWN IN EAST HEMPFIELD TWP.
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