A powerful storm system will continue to bring heavy mountain snow, rain, and high winds to the Pacific Northwest and northern California through midweek. Heavy rain and flash flooding potential exists across the central Gulf Coast over the next few days, including the Florida Panhandle. A Slight Risk (level 2 of 4) of excessive rainfall is in effect Tuesday. Read More >
Overview
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A line of strong thunderstorms developed in parts of the Midwest during the day on Friday, and moved rapidly east through Pennsylvania. These thunderstorms produced high winds across much of the state with storm damage reported from Warren to Lancaster Counties. What produced these thunderstorms and why were they so severe? Warm and very humid air set up residence across the state Friday, with temperatures reaching into the upper 80s and low 90s. This combined with Dewpoint Temperatures approaching 70 degrees resulted in a very unstable atmosphere. Warm and dry air aloft prevented us from seeing the popcorn thunderstorms that most of have been dealing with this spring. Instead, a cold front in the Midwest would provide the focus for thunderstorms. Tapping into the dry air aloft and a strong Low Level Jet helped these thunderstorms develop very strong downdrafts and a Rear Inflow Jet. These combined to rapidly accelerate the line of thunderstorms and resulting widespread wind damage.
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 EACH BLUE DOT REPRESENTS A WIND DAMAGE REPORT |
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| MAXIMUM TEMPERATURES OVER PENNSYLVANIA FOR JUNE 8TH, 2007 | TWO DAY PRECIPITATION TOTALS FROM NWS COOP REPORTING STATIONS ENDING 7:00 AM JUNE 10TH, 2007 |
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| UPPER AIR SOUNDING FROM PITTSBURGH 8:00 AM FRIDAY MORNING | UPPER AIR SOUNDING FROM PITTSBURGH 2:00 PM FRIDAY AFTERNOON |
Radar
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| STORMS APPROACHING CENTRAL PENNSYLVANIA | STORMS MOVING THROUGH CENTRAL PENNSYLVANIA | IDENTIFICATION OF STRONG WINDS ASSOCIATED WITH THESE STORMS | STORMS MOVING INTO EASTERN PENNSYLVANIA AND WEAKENING |
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| NWS STATE COLLEGE RADAR REFLECTIVITY LOOP 6:00 TO 10:00 PM JUNE 8TH | NWS STATE COLLEGE RADAR REFLECTIVITY AND STORM RELATIVE VELOCITY LOOP 8:00 TO 9:00 PM JUNE 8TH |
NWS STATE COLLEGE RADAR REFLECTIVITY AND STORM RELATIVE VELOCITY LOOP 8:00 TO 9:31 PM JUNE 8TH |
IR AND LIGHTNING LOOP 6:00 PM TO 9:30 PM JUNE 8TH |
Storm Reports
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
154 PM EDT SAT JUN 09 2007
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
0600 PM TSTM WND DMG SOMERSET 40.01N 79.08W
06/08/2007 SOMERSET PA LAW ENFORCEMENT
NUMEROUS TREES AND WIRES DOWN IN SOMERSET, CENTRAL CITY,
BERLIN, AND CONEMAUGH TOWNSHIPS.
0620 PM TSTM WND DMG WARREN 41.84N 79.14W
06/08/2007 WARREN PA LAW ENFORCEMENT
NUMEROUS TREES AND POWER LINES DOWN IN WARREN AND SEVERAL
TOWNSHIPS THROUGHOUT THE COUNTY.
0630 PM TSTM WND DMG 2 SSE BEDFORD 39.99N 78.49W
06/08/2007 BEDFORD PA TRAINED SPOTTER
SEVERAL TREES AND WIRES DOWN IN BEDFORD BOROUGH. ONE TREE
FELL ON VEHICLE IN EAST PENN STREET.
0630 PM TSTM WND DMG WINDBER 40.23N 78.83W
06/08/2007 SOMERSET PA LAW ENFORCEMENT
SPORADIC TREE DAMAGE OVER NORTHERN SOMERSET COUNTY.
0635 PM TSTM WND DMG EVERETT 40.01N 78.37W
06/08/2007 BEDFORD PA TRAINED SPOTTER
SEVERAL TREES DOWN.
0640 PM TSTM WND DMG RIDGWAY 41.43N 78.73W
06/08/2007 ELK PA LAW ENFORCEMENT
SEVERAL TREES AND WIRES DOWN REPORTED IN RIDGWAY,
JOHNSONBURG, SAINT MARYS, AND SEVERAL MORE TOWNSHIPS.
0645 PM TSTM WND DMG WESTMONT 40.32N 78.95W
06/08/2007 CAMBRIA PA EMERGENCY MNGR
TREES AND WIRES DOWN, POWER OUT IN WESTMONT BORO.
SPORADIC TREE DAMAGE THROUGHOUT THE COUNTY.
0655 PM TSTM WND DMG WETMORE 41.69N 78.86W
06/08/2007 MCKEAN PA LAW ENFORCEMENT
SEVERAL TREES AND WIRES DOWN IN WETMORE, HAMLIN, AND
SEVERAL MORE TOWNSHIPS IN THE COUNTY.
0700 PM TSTM WND DMG CLEARFIELD 41.02N 78.44W
06/08/2007 CLEARFIELD PA LAW ENFORCEMENT
SEVERAL TREES DOWN IN CLEARFIELD BOROUGH, LAWRENCE
TOWNSHIP, AND SEVERAL OTHER TOWNSHIPS IN THE COUNTY.
0705 PM TSTM WND DMG ALTOONA 40.51N 78.40W
06/08/2007 BLAIR PA LAW ENFORCEMENT
SEVERAL TREES AND WIRES DOWN IN ALTOONA, DUNCANSVILLE,
HOLLIDAYSBURG, AND SEVERAL MORE TOWNSHIPS IN THE COUNTY.
0720 PM TSTM WND DMG 2 ESE MIDDLETOWN 40.19N 76.69W
06/08/2007 DAUPHIN PA LAW ENFORCEMENT
SOME TREES REPORTED DOWN IN LONDONDERRY TOWNSHIP.
0740 PM TSTM WND DMG ROULETTE 41.77N 78.16W
06/08/2007 POTTER PA LAW ENFORCEMENT
SEVERAL TREES AND WIRES DOWN IN ROULETTE, SWEDEN, AND
AUSTIN TOWNSHIPS.
0740 PM TSTM WND DMG EMPORIUM 41.51N 78.24W
06/08/2007 CAMERON PA TRAINED SPOTTER
SEVERAL TREES AND WIRES DOWN IN EMPORIUM AND DRIFTWOOD
TOWNSHIPS.
0740 PM HIGH SUST WINDS STATE COLLEGE 40.79N 77.86W
06/08/2007 E60.00 MPH CENTRE PA NWS EMPLOYEE
GUSTS TO 60 MILES PER HOUR ACCOMPANIED THUNDERSTORM
MOVING THROUGH STATE COLLEGE. ALSO, SEVERAL TREES AND
WIRES DOWN.
0745 PM TSTM WND DMG ALEXANDRIA 40.56N 78.10W
06/08/2007 HUNTINGDON PA LAW ENFORCEMENT
SEVERAL TREES AND WIRES DOWN IN ALEXANDRIA, BARREE, AND
SEVERAL MORE TOWNSHIPS IN THE COUNTY.
0750 PM TSTM WND DMG LOCK HAVEN 41.14N 77.45W
06/08/2007 CLINTON PA LAW ENFORCEMENT
SEVERAL TREES AND WIRES DOWN IN LOCK HAVEN AND SEVERAL
TOWNSHIPS THROUGHOUT THE COUNTY.
0755 PM TSTM WND DMG WAYNESBORO 39.75N 77.58W
06/08/2007 FRANKLIN PA LAW ENFORCEMENT
SEVERAL TREES AND WIRES DOWN IN WAYNESBORO, PETERS, SAINT
THOMAS, AND SEVERAL MORE TOWNSHIPS IN THE COUNTY.
0755 PM TSTM WND DMG MANSFIELD 41.81N 77.08W
06/08/2007 TIOGA PA LAW ENFORCEMENT
SEVERAL TREES AND WIRES DOWN IN MANSFIELD, ROSEVILLE,
MILLERTON, AND SEVERAL MORE TOWNSHIPS IN THE COUNTY.
0800 PM TSTM WND DMG LEWISTOWN 40.60N 77.57W
06/08/2007 MIFFLIN PA LAW ENFORCEMENT
SEVERAL TREES AND WIRES DOWN IN LEWISTOWN, BELLTOWN, AND
SEVERAL MORE TOWNSHIPS IN THE COUNTY.
0800 PM TSTM WND DMG HONEY GROVE 40.42N 77.55W
06/08/2007 JUNIATA PA LAW ENFORCEMENT
SEVERAL TREES AND WIRES DOWN IN HONEY GROVE, WALNUT,
MCALISTERVILLE, AND SEVERAL MORE TOWNSHIPS IN THE COUNTY.
0810 PM TSTM WND DMG CASHTOWN 39.88N 77.34W
06/08/2007 ADAMS PA LAW ENFORCEMENT
SEVERAL TREES AND WIRES DOWN IN TYRONE, CASHTOWN, AND
SEVERAL MORE TOWNSHIPS IN THE COUNTY.
0820 PM TSTM WND DMG 3 SW HARTLETON 40.87N 77.20W
06/08/2007 UNION PA LAW ENFORCEMENT
SEVERAL TREES AND WIRES DOWN IN GLEN IRON TOWNSHIP.
0820 PM TSTM WND DMG LOYSVILLE 40.38N 77.33W
06/08/2007 PERRY PA LAW ENFORCEMENT
SEVERAL TREES AND WIRES DOWN IN LOYSVILLE, ICKESBURG, AND
SEVERAL MORE TOWNSHIPS IN THE COUNTY.
0820 PM TSTM WND DMG SHIPPENSBURG 40.05N 77.52W
06/08/2007 CUMBERLAND PA LAW ENFORCEMENT
SEVERAL TREES AND WIRES DOWN REPORTED IN SHIPPENSBURG,
COOKES, MONROE, UPPER ALLEN, HAMPTON AND SEVERAL MORE
TOWNSHIPS.
0820 PM TSTM WND DMG 1 SW MCSHERRYSTOWN 39.79N 77.03W
06/08/2007 ADAMS PA LAW ENFORCEMENT
SEVERAL TREES DOWN IN CONEWAGO TOWNSHIP.
0830 PM TSTM WND DMG 2 E SAFE HARBOR 39.92N 76.36W
06/08/2007 LANCASTER PA FIRE DEPT/RESCUE
SCATTERED STORM DAMAGE WITH A FEW TREES DOWN IN CONESTOGA
TOWNSHIP.
0835 PM TSTM WND DMG 3 ENE WELLSBORO 41.76N 77.25W
06/08/2007 TIOGA PA LAW ENFORCEMENT
SEVERAL TREES AND WIRES DOWN IN CHARLESTOWN, RUTLAND, AND
WESTFIELD TOWNSHIPS.
0842 PM TSTM WND DMG MILLERSBURG 40.54N 76.96W
06/08/2007 DAUPHIN PA EMERGENCY MNGR
MULTIPLE TREES DOWN ALONG ROUTE 147
0844 PM TSTM WND DMG BEAVER SPRINGS 40.74N 77.22W
06/08/2007 SNYDER PA LAW ENFORCEMENT
SEVERAL TREES AND WIRES DOWN IN BEAVER AND UNION
TOWNSHIPS.
0845 PM TSTM WND DMG WILLIAMSPORT 41.24N 77.02W
06/08/2007 LYCOMING PA LAW ENFORCEMENT
SEVERAL TREES AND WIRES DOWN IN WILLIASMPORT.
0845 PM TSTM WND DMG MCALISTERVILLE 40.63N 77.28W
06/08/2007 JUNIATA PA EMERGENCY MNGR
NUMEROUS WIRES AND TREES DOWN.
0915 PM TSTM WND DMG SHAMOKIN 40.79N 76.55W
06/08/2007 NORTHUMBERLAND PA LAW ENFORCEMENT
SEVERAL TREES AND WIRES DOWN IN SHAMOKIN, SUNBURY,
JACKSON, AND LOWER MAHANOY TOWNSHIPS.
0925 PM TSTM WND DMG LEBANON 40.34N 76.42W
06/08/2007 LEBANON PA LAW ENFORCEMENT
TREES DOWN IN LEBANON TOWNSHIP AND ALONG THE PENNSYLVANIA
TURNPIKE.
0935 PM TSTM WND DMG MUNCY VALLEY 41.35N 76.60W
06/08/2007 SULLIVAN PA LAW ENFORCEMENT
SEVERAL TREES AND WIRES DOWN REPORTED IN MUNCY VALLEY AND
LINCOLN FALLS TOWNSHIPS.
0945 PM TSTM WND DMG 3 SE WASHINGTONVILLE 41.02N 76.63W
06/08/2007 MONTOUR PA LAW ENFORCEMENT
SEVERAL TREES AND WIRES REPORTED DOWN IN VALLEY AND
LIBERTY TOWNSHIPS.
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