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The June 8th Squall Line Event
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.


UPPER AIR SOUNDING FROM PITTSBURGH ON FRIDAY MORNING
UPPER AIR SOUNDING FROM PITTSBURGH 8:00 AM FRIDAY MORNING

UPPER AIR SOUNDING FROM PIT FOR 18Z

UPPER AIR SOUNDING FROM PITTSBURGH 2:00 PM FRIDAY AFTERNOON

STORMS APPROACHING CENTRAL PENNSYLVANIA

STORMS APPROACHING CENTRAL PENNSYLVANIA

STORMS MOVING THROUGH CENTRAL PENNSYLVANIA
STORMS MOVING THROUGH CENTRAL PENNSYLVANIA

IDENTIFICATION OF STRONG WINDS ASSOCIATED WITH THESE STORMS
IDENTIFICATION OF STRONG WINDS ASSOCIATED WITH THESE STORMS

STORMS MOVING INTO EASTERN PENNSYLVANIA AND WEAKENING
STORMS MOVING INTO EASTERN PENNSYLVANIA AND WEAKENING

EACH BLUE DOT REPRESENTS A WIND DAMAGE REPORT
EACH BLUE DOT REPRESENTS A WIND DAMAGE REPORT

Top wind speed reported at local airports:

University Park

32 MPH
Blair Co Airport 46 MPH
Bradford 44 MPH
Capitol City Airport 37 MPH
Clearfield 47 MPH
Williamsport 47 MPH
Johnstown 52 MPH
Middletown Airport 33 MPH
Thomasville 38 MPH
Selinsgrove 41 MPH





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.

LOCAL STORM REPORTS RECEIVED AT THE STATE COLLEGE NWS OFFICE

maximum temperature for June 8th

MAXIMUM TEMPERATURES OVER PENNSYLVANIA FOR JUNE 8TH, 2007

2 Day Precipitation Totals from COOP reporting stations

TWO DAY PRECIPITATION TOTALS FROM NWS COOP REPORTING STATIONS ENDING 7:00 AM JUNE 10TH, 2007

overview of radar reflectivity NWS StateCollege

NWS STATE COLLEGE RADAR REFLECTIVITY LOOP 6:00 TO 10:00 PM JUNE 8TH
(CLICK IMAGE FOR LARGER VIEW)

REFLECTIVITY AND STORM RELATIVE VELOCITY IMAGE LOOP

NWS STATE COLLEGE RADAR REFLECTIVITY AND STORM RELATIVE VELOCITY
LOOP 8:00 TO 9:00 PM JUNE 8TH
(CLICK IMAGE FOR LARGER VIEW)

REFLECTIVITY AND STORM RELATIVE VELOCITY

NWS STATE COLLEGE RADAR REFLECTIVITY AND STORM RELATIVE VELOCITY
LOOP 8:00 TO 9:31 PM JUNE 8TH
(CLICK IMAGE FOR LARGER VIEW)

SATELLITE AND LIGHTNING LOOP

IR AND LIGHTNING LOOP 6:00 PM TO 9:30 PM JUNE 8TH
(CLICK IMAGE FOR LARGER VIEW


 
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Page Last Modified: 29 June 2007 19:24:21 UTC
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