An isolated thunderstorm in McKean County produced localized heavy rain and flash flooding during the late evening.
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The episode as NWS CTP wrote it up.
An isolated thunderstorm in McKean County produced localized heavy rain and flash flooding during the late evening.
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 12, 7:52 PM EST, 23 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 852 PM EDT THU JUL 12 2012 .SYNOPSIS... BROAD UPPER LEVEL TROUGHING IN THE MISSISSIPPI VALLEY WILL COMBINE WITH AN INCREASINGLY MOIST SOUTH-SOUTHWESTERLY RETURN FLOW TO BRING SOME MUCH NEEDED RAINFALL TO PORTIONS OF THE KEYSTONE STATE THIS WEEKEND AND INTO EARLY NEXT WEEK. && .NEAR TERM /UNTIL 7 AM FRIDAY MORNING/... SLOW MOVING STORM OVER MCKEAN COUNTY LIKELY PRODUCING FLOODING RAIN AS IT HAS BEEN NEARLY STATIONARY FOR THE LAST 2+ HRS. THE ENTIRE REST OF THE CWA HAS QUIETED DOWN NICELY...AND LOSS OF HEAT AND NESDIS SAT ANALYSIS ALSO LEADS TO A FORECAST OF A SLOW WEAKENING OF THE CURRENTLY ACTIVE CELLS. CONVERGENCE IN THE NRN TIER WILL MOST LIKELY KEEP SOME SHRA GOING INTO THE EARLY NIGHT...BUT THESE SHOULD BE LESS POTENT. HIGH CLOUDS STREAMING OVERHEAD. PLACES WHERE IT DID RAIN COULD HAVE FOG IN THE A.M. MINS WILL BE INTERESTING WITH GENERALLY DRY AIRMASS BUT VARIABLE CLOUDS. DEWPOINTS RANGE FROM 50F AT UNV TO THE L60S IN THE SE. WILL HOLD WITH PREV MIN FCST FOR NOW AS HOURLY TEMPS ARE ON TRACK. && .SHORT TERM /7 AM FRIDAY MORNING THROUGH 6 PM FRIDAY/... DEEP LAYER MOISTURE WILL CONTINUE TO SLOWLY INCREASE OVER THE REGION ON FRIDAY. THIS SHOULD ALLOW GREATER COVERAGE AND INTENSITY OF SHOWERS AND THUNDERSTORMS TO SPROUT IN THE AFTERNOON AND EVENING... AND CORRESPONDINGLY HAVE KEPT POPS IN THE 30-40% RANGE FOR FRI AFTERNOON ACROSS THE WEST AND 20-30% IN THE EAST. HUMIDITY WILL START TO BECOME MORE OF A FACTOR LATE IN THE DAY OR FRIDAY NIGHT AS 1.5" PW REACHES INTO SOUTHWEST PA AND SFC DEWPOINTS START TO CREEP UP THROUGH THE 60S FROM SOUTH TO NORTH. KEPT LAUREL HIGHLANDS COOLEST WITH GREATEST CLOUD COVER THERE...WHERE HIGHS SHOULD BE IN THE MID TO UPPER 70S. HIGHS ELSEWHERE SHOULD RANGE THROUGH THE LOWER TO MIDDLE 80S FOR THE MOST PART. && .LONG TERM /FRIDAY NIGHT THROUGH THURSDAY/... PENNSYLVANIA WILL BE SITUATED BETWEEN A RIDGE OF HIGH PRESSURE OVER THE ATLANTIC OCEAN AND WEAK TROUGHING IN THE MISSISSIPPI VALLEY THIS WEEKEND. THIS WILL LEAD TO INCREASINGLY MOIST SW FLOW. THE 12Z GEFS SHOWS A PLUME OF HIGHER PWATS /+1 TO +2SD/ PUSHING ACROSS THE AREA FROM SAT THROUGH MON. EXPECT A WARM AND HUMID WEEKEND...WITH MORE CLOUDS THAN SUN AND A CHC OF MAINLY AFTN/EVE SHOWERS AND THUNDERSTORMS. THE EARLY PART OF NEXT WEEK WILL REMAIN WARM AND HUMID. A WEAK SHORTWAVE WILL DROP ACROSS THE GREAT LAKES SUN/EARLY MON...BUT IT FLATTENS OUT AS IT MOVES ACROSS THE NORTHEASTERN UNITED STATES. A MORE SIGNIFICANT TROUGH WILL DIG INTO THE NORTHEASTERN UNITED STATES AROUND MIDWEEK...AND A COLD FRONT WILL DROP SOUTHEASTWARD ACROSS THE REGION...ACCOMPANIED BY INCR POPS AND FOLLOWED BY A DRIER AIRMASS. && .AVIATION /01Z FRIDAY THROUGH TUESDAY/... PERSISTENT TSTM CLUSTER LINGERING NEAR KBFD AT 00Z...SHOULD GRADUALLY DIMINISH THROUGH 02Z. ELSEWHERE...ISOLATED CONVECTION OVER ALLEGHENIES AND NORTHERN MTNS HAS DIED OFF WITH SUNSET. EXPECT OVERNIGHT HOURS TO BE QUIET...WITH MVFR VSBY POSS AGAIN TOWARD SUNRISE. BUT THESE WILL IMPROVE QUICKLY ON FRI. TYPICAL SUMMERTIME AIR MASS WILL BRING SCT AFTERNOON/EVENING SHRA/TSRA AND LOCAL MVFR CIGS /BEST CHANCE IN SW/...AND THESE SHOULD AGAIN DECREASE BY 02Z SAT. UNSETTLED CONDS WILL PERSIST THIS WEEKEND WITH DAILY CHANCES OF SHRA/TSRA IN THE AFTERNOON AND EVENING ESPECIALLY. OUTLOOK... FRI...ISOLD-SCT AFTN AND EVE TSTMS POSSIBLE...ESP OVR SW PA. SAT-MON...SCT THUNDERSTORMS WITH REDUCED VSBYS AND CIGS LIKELY AT TIMES. TUE...MVFR TO VFR. && .CTP WATCHES/WARNINGS/ADVISORIES... NONE. && SYNOPSIS...DEVOIR NEAR TERM...DANGELO/DEVOIR SHORT TERM...DEVOIR LONG TERM...EVANEGO AVIATION...RXR
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA 556 AM EDT THU JUL 12 2012 PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046-049>053- 056>059-063>066-131000- WARREN-MCKEAN-POTTER-ELK-CAMERON-NORTHERN CLINTON-CLEARFIELD- NORTHERN CENTRE-SOUTHERN CENTRE-CAMBRIA-BLAIR-HUNTINGDON-MIFFLIN- JUNIATA-SOMERSET-BEDFORD-FULTON-FRANKLIN-TIOGA-NORTHERN LYCOMING- SULLIVAN-SOUTHERN CLINTON-SOUTHERN LYCOMING-UNION-SNYDER-MONTOUR- NORTHUMBERLAND-COLUMBIA-PERRY-DAUPHIN-SCHUYLKILL-LEBANON-CUMBERLAND- ADAMS-YORK-LANCASTER- 556 AM EDT THU JUL 12 2012 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...FRIDAY THROUGH WEDNESDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
The Buffalo radar (KBUF), 117 km away, was scanning. The volume nearest the first event began at 01:17 UTC.
1 flash flood. Local standard time, as filed.
Thunderstorm rains produced localized flash flooding in the small town of Rew. Flood waters covered the Main Street intersection (SR 46 and 646) which runs through the center of town.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2012Every state in 2012This day in weather historyWarnings in Pennsylvania, July 2012
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: 385408.