A slow moving cold front triggered widely scattered thunderstorms during the afternoon and evening. A few storms produced isolated wind damage across Lycoming County.
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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 slow moving cold front triggered widely scattered thunderstorms during the afternoon and evening. A few storms produced isolated wind damage across Lycoming County.
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 Jul 26, 1:13 PM EST, 1 hour 42 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 213 PM EDT SUN JUL 26 2009 .SYNOPSIS... A PERSISTENT UPPER LEVEL TROUGH OVER THE GREAT LAKES WILL CONTROL THE WEATHER FOR MUCH OF THE UPCOMING WEEK WITH OCCASIONAL BOUTS OF SHOWERS AND THUNDERSTORMS. && .NEAR TERM /THROUGH TONIGHT/... REMAINS OF AN MCV HAS HAS MOVED INTO NY...LEAVING BEHIND A MARGINALLY UNSTABLE AIRMASS THAT IS RESPONDING WITH SEVERAL BROKEN LINES OF CONVECTION FROM THE NW MOUNTAINS DOWN INTO THE CENTRAL PART OF MY FCST AREA. RUC INDICATES CAPES NUDGING UP AROUND 1000J ALONG WITH MID LEVEL LAPSE RATES RIGHT AROUND 6C/KM...SO THE REMAINDER OF THE AFTERNOON LOOKS UNSETTLED. WITH JUST WEAK LOW LEVEL CONVERGENCE...ITS HARD TO PINPOINT WHERE THE CHANCES FOR BEST DEVELOPMENT WILL BE. PROGS INDICATE THE BEST INSTABILITY EVENTUALLY FORMS OVER MY SERN ZONES WHERE WE HAVE A SLIGHT RISK IN PLACE. SATELLITE SHOWS BREAKS DEVELOPING SO IT LOOKS REASONABLE FOR SOME OF THE STORMS TO EVENTUALLY GROW UP AND POSSIBLY CAUSE LOCALIZED STRONG WIND GUSTS OR SOME HAIL. WE HAVE A FLASH FLOOD WATCH UP FOR OUR SERN COUNTIES. THIS IS WHERE THE SREF/MREF PLUMES DEPICT THE BEST CAPES LATER TODAY AS THE SFC FRONT SLIDES EAST. 12Z OPERATIONAL MODELS QPFS ARE NOT IMPRESSIVE HOWEVER AND INDICATIONS ARE THE BEST PLUME OF PRECIP WATER IS ALREADY OVER THE AREA AND ADVECTING DOWNSTREAM. 09Z SREF SHOWS NO CHANCE OF 12 HOUR RAINFALLS OF MORE THAN AN INCH AND JUST A 10% OR SO CHANCE OF QPF AT LEAST .50 INCHES. SOME FLASH FLOOD GUIDANCE IS ADMITTEDLY LOW SO WITH THE POTENTIAL DEVELOPMENT OF A LINE OF STORMS TO THE WEST...WILL KEEP THE WATCH IN PLACE FOR NOW. INTERESTING TO NOTE THAT THE LOCAL WRF RUNS CAPTURED THE MCS/MCV THAT ROLLED THRU THIS MORNING...BUT WITH DIFFERENT IDEAS ON QPF. BOTH THE NMM AND ARW RUNS HAD THE HEAVIEST PRECIP A BIT TOO FAR SOUTHWEST WITH THE NMM SHOWING A 3 HOUR MAX OF ABOUT .75 FROM ABOUT NRN BEDFORD THROUGH CENTRAL HUNTINGDON COUNTIES. THE ARW RUN PLACED NEARLY 3 INCHES OF RAIN IN ROUGHLY THE SAME AREA. A PEEK AT THE VORT PROGS HINTS THAT BOTH MODELS SUFFERED FROM A CONVECTIVE FEEDBACK ISSUE WITH THE ARW COOKING UP A NEGATIVE 40 BULLSEYE IN THE 500 VORT FIELD. A GOOD INDICATION OF INSTABILITY GONE WILD IN THAT RUN OF THE MODEL. LOWER RES RUNS OF THE NAM/GFS DID MUCH BETTER WITH THE MORE WIDESPREAD BUT MUCH LIGHTER PRECIP FIELD. COOLING BLYR WILL RESULT IN DECREASING CVRG OF SHWRS/TSTORMS AFTER 03Z...AND HAVE TAPERED POPS DOWN ACCORDINGLY. HIGH TEMPS TODAY WILL BE SLIGHTLY COOLER THAN AVG OVR THE N/W MTNS...AND NEAR TO 1-2F ABOVE NORMAL ACROSS THE CENTRAL MTNS AND SUSQ VLY. && .SHORT TERM /MONDAY/... A RELATIVE MIN IN PRECIPITABLE WATER (27-30MM) WILL BECOME CENTERED OVER CENTRAL PA MONDAY AS THE UPPER TROF THAT HAS PLAGUED THE AREA SINCE JUNE FINALLY BEGINS TO LIFT OUT OF THE AREA. THE OVERALL LONG-WAVE TROF IS EXPECTED TO BEGIN RETROGRADING WITH THE THE NET RESULT BEING THE DEVELOPMENT OF A MOIST AND INCREASINGLY WARM SOUTHWEST FLOW AT ALL LEVELS. UNFORTUNATELY WE STILL CANNOT SEEM TO GUARANTEE A DRY DAY AS THERE WILL STILL BE CYCLONIC FLOW ALOFT WITH THE OPERATIONAL MODELS FORECASTING AT LEAST SOME MODEST INSTABILITY TO FORM. OVERALL HOWEVER IT LOOKS LIKE THE NEW WEEK WILL START OFF WITH THE BEST CHANCE OF SEEING THE MOST DRY WEATHER WE HAVE SEEN IN SEVERAL DAYS. WITH A FAIR AMOUNT OF SUNSHINE...HIGHS SHOULD ACTUALLY REBOUND TO VERY NEAR NORMAL FOR A CHANGE. IF IT HAS SEEMED LIKE A COLD SUMMER TO SOME...IT HAS BEEN. TEMPERATURE DEPARTURES SINCE THE BEGINNING OF JUNE OVER THE REGION ARE RUNNING AS MUCH AS 7 DEGREES BELOW NORMAL IN SOME AREAS. && .LONG TERM /MONDAY NIGHT THROUGH SUNDAY/... TUESDAY MAY BE THE WARMEST DAY WEVE SEEN IN MOST AREAS FOR QUITE SOME TIME. WEAK HIGH PRESSURE RIDGE AT THE SFC WITH SW FLOW ALOFT AND AND RATHER MEAGER 850-500 MB LAPSE RATES (WITH A NOTABLE MID LEVEL CAP) WILL MINIMIZE THE CHC FOR SHOWERS/TSRA. INFLUENCE OF UPPER TROF OVER THE GREAT LAKES/NORTHEAST WILL CONTINUE TO BE FELT THRU MUCH IF NOT ALL OF THE LONG TERM PD. NUMEROUS SHORTWAVES TRAVELING THROUGH THE BASE OF THE TROF WILL POTENTIALLY SUPPORT CONVECTION EACH DAY WITH ONE MAIN FRONT ADVANCING EAST DURING THE WEEK. THIS MAIN...WEAK COLD FRONT WILL MOVE EAST FROM THE OHIO VALLEY LATE WED/WED NIGHT...TRIGGERING SCATTERED...MAINLY MID TO LATE AFTERNOON TSRA. THIS FRONT WILL LIKELY STALL OUT THURSDAY INTO FRIDAY FROM THE MID ATLANTIC COAST SWWD TO THE LOWER OHIO VALLEY AS WEAK RIDGING AT THE SFC AND ALOFT SLIDES OVER CENTRAL PENN. ALTHOUGH OUR GRIDS AND ZONE TEXT CURRENTLY PAINT A ROUGHLY 40 POP FOR A SHOWER OR TSRA IN THE AFTERNOON (BASED ON THE PERSISTENCE OF A MORE PESSIMISTIC GEFS SOLUTION)...THURSDAY SHOULD BE ANOTHER FAIRLY DRY...AND SEASONABLY WARM DAY. WEDNESDAYS HIGHS WILL BE SIMILAR TO TUESDAYS WARMTH OVER CENTRAL AND ERN PARTS OF THE CWA. HOWEVER...MORE CLOUD COVER AND SCATTERED AFTERNOON SHOWERS/TSRA WILL CAP OFF HIGHS - IN THE THE MID TO UPPER 70S ACROSS THE MTNS OF WRN PENN. BOTH THE GFS AND EC SHOW A SIGNIFICANT SHORT WAVE AND ONE OR MORE SFC LOWS RIPPLING NE UP THE OHIO VALLEY FRIDAY (THE ALONG THE TAIL END OF THE STALLED OUT FRONTAL BOUNDARY). CURRENT RUNNING 40 POPS IN OUR GRIDS LOOK GOOD AS THERE IS SOME DISAGREEMENT BETWEEN THE EC/GFS AND GEFS ON THE TRACK OF THE SFC AND UPR WAVES. EC IS THE FURTHEST SOUTH WITH ITS QPF (MAINLY ACROSS VA AND MD) FRIDAY. SLIGHT IMPROVEMENT POSSIBLE FOR SATURDAY...BUT GEFS PLUMES STILL WARRANT THE MENTION OF SCATTERED POPS THANKS TO ANOTHER WEAK IMPULSE EMBEDDED IN THE SW FLOW ALOFT. && .AVIATION /18Z SUNDAY THROUGH FRIDAY/... A WEAK FRONT SLIDING INTO THE REGION IS DOING ITS BEST TO TRIGGER YET ANOTHER ROUND OF SHOWERS AND STORMS. A BIT MORE HUMIDITY TODAY HAS LED TO SOME MVFR CEILINGS OVER THE CENTRAL AND WESTERN TERMINALS. ACTIVITY WILL CONTINUE INTO THE EVENING HOURS BEFORE DIMINISHING IN COVERAGE TO JUST A FEW SCATTERED SHOWERS AFTER MIDNIGHT. LOW LEVEL MOISTURE WILL REMAIN HOWEVER...LEADING TO LOWERING CEILINGS/VISIBILITIES OVERNIGHT. MVFR CIGS IN THE 1500-2500 RANGE WILL LIKELY BE THE RULE BY MORNING WITH VIZ OF 3-5 MILES. SOME LOCALLY LOWER CONDITIONS WILL BE POSSIBLE IN ANY AREAS THAT GET HIT WITH THE STORMS TODAY AS LOCALLY DENSE FOG COULD FORM. OUTLOOK... MON-FRI...VFR WITH MVFR MAINLY IN THE AM WITH FOG/ST AND AGAIN IN THE PM WITH SCT SHRA/TSRA. && .CTP WATCHES/WARNINGS/ADVISORIES... FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR PAZ036-056>059- 063>066. && SYNOPSIS...LACORTE NEAR TERM...LACORTE SHORT TERM...LACORTE/LAMBERT LONG TERM...LAMBERT AVIATION...LACORTE
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA 344 AM EDT SUN JUL 26 2009 PAZ004>006-010>012-017>019-024>028-033>035-037-041-045-270745- WARREN-MCKEAN-POTTER-ELK-CAMERON-NORTHERN CLINTON-CLEARFIELD- NORTHERN CENTRE-SOUTHERN CENTRE-CAMBRIA-BLAIR-HUNTINGDON-MIFFLIN- JUNIATA-SOMERSET-BEDFORD-FULTON-TIOGA-NORTHERN LYCOMING- SOUTHERN CLINTON- 344 AM EDT SUN JUL 26 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. PAZ036-056>059-063>066-270745- FRANKLIN-PERRY-DAUPHIN-SCHUYLKILL-LEBANON-CUMBERLAND-ADAMS-YORK- LANCASTER- 344 AM EDT SUN JUL 26 2009 ...FLASH FLOOD WATCH IN EFFECT FROM NOON EDT TODAY THROUGH LATE TONIGHT... THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT. PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV/STATECOLLEGE ON THE INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS. FLASH FLOOD WATCH. THERE IS ALSO A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING. THE PRIMARY SEVERE WEATHER THREAT WILL BE DAMAGING WINDS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING. PAZ042-046-049>053-270745- SULLIVAN-SOUTHERN LYCOMING-UNION-SNYDER-MONTOUR-NORTHUMBERLAND- COLUMBIA- 344 AM EDT SUN JUL 26 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND EVENING. THE PRIMARY SEVERE WEATHER THREAT WILL BE DAMAGING WINDS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING. STEINBUGL
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
211 PM EDT SUN JUL 26 2009
PAZ006-012-041-261845-
NORTHERN CLINTON PA-NORTHERN LYCOMING PA-POTTER PA-
211 PM EDT SUN JUL 26 2009
...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN CLINTON...
NORTHWESTERN LYCOMING AND SOUTHEASTERN POTTER COUNTIES...
AT 208 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 30 MILES NORTHWEST
OF LOCK HAVEN...MOVING NORTHEAST AT 25 MPH.
WIND GUSTS TO 50 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM.
THIS STORM WILL BE NEAR TAMARACK AROUND 215 PM...CROSS FORK AROUND
220 PM...CROSS FORK AROUND 225 PM AND OLE BULL STATE PARK AROUND 240
PM.
THIS WILL IMPACT STATE ROAD 120.
LAT...LON 4163 7761 4155 7760 4154 7753 4137 7746
4128 7797 4135 7801 4136 7800 4150 7800
4166 7763
EXPERIMENTAL
FORECASTER: EVANEGOSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
239 PM EDT SUN JUL 26 2009
PAZ006-012-037-041-261915-
NORTHERN CLINTON PA-NORTHERN LYCOMING PA-POTTER PA-TIOGA PA-
239 PM EDT SUN JUL 26 2009
...A STRONG THUNDERSTORM WILL AFFECT NORTH CENTRAL CLINTON...
NORTHWESTERN LYCOMING...SOUTHEASTERN POTTER AND SOUTHWESTERN TIOGA
COUNTIES...
AT 238 PM EDT...A STRONG THUNDERSTORM WAS LOCATED 22 MILES SOUTHWEST
OF WELLSBORO...MOVING NORTHEAST AT 30 MPH.
WIND GUSTS TO 50 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM.
THIS STORM WILL BE NEAR SLATE RUN AROUND 245 PM...LEETONIA AROUND 255
PM...AND LEONARD HARRISON STATE PARK AROUND 305 PM.
THIS STORM WILL IMPACT ROUTE 6.
LAT...LON 4181 7745 4169 7725 4154 7717 4140 7764
4151 7780
EXPERIMENTAL
FORECASTER: EVANEGOSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
346 PM EDT SUN JUL 26 2009
PAZ041-046-262015-
NORTHERN LYCOMING PA-SOUTHERN LYCOMING PA-
346 PM EDT SUN JUL 26 2009
...A STRONG THUNDERSTORM WILL AFFECT EASTERN LYCOMING COUNTY...
AT 345 PM EDT...A STRONG THUNDERSTORM WAS LOCATED NEAR GARDEN VIEW...
MOVING NORTHEAST AT 25 MPH.
WIND GUSTS TO 50 MPH AND SMALL HAIL ARE POSSIBLE WITH THIS STORM.
THIS STORM WILL BE NEAR MONTOURSVILLE AROUND 400 PM...LOYALSOCKVILLE
AROUND 410 PM AND BARBOURS AROUND 420 PM.
LAT...LON 4147 7677 4141 7675 4138 7671 4127 7665
4115 7712 4132 7721 4148 7678
EXPERIMENTAL
FORECASTER: KFThe State College radar (KCCX), 85 km away, was scanning. The volume nearest the first event began at 19:56 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds estimated near 60 mph knocked down trees near Perryville.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2009Every state in 2009This day in weather historyWarnings in Pennsylvania, July 2009
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: 174968.