Isolated strong to severe thunderstorms developed during the afternoon and produced localized gusty winds, small hail and heavy rainfall.
Every event with a place to put it. Tap one for its entry below.
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.
Isolated strong to severe thunderstorms developed during the afternoon and produced localized gusty winds, small hail and heavy rainfall.
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 27, 3:46 PM EST, 9 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 446 PM EDT FRI JUL 27 2012 .SYNOPSIS... A SLOW MOVING COLD FRONT NEAR INTERSTATE 80 LATE FRIDAY WILL PUSH SLOWLY SOUTH ACROSS PENNSYLVANIA TONIGHT AND SATURDAY ACCOMPANIED BY A FEW ROUNDS OF SHOWERS AND THUNDERSTORMS. A RIDGE OF HIGH PRESSURE WILL BUILD OVER THE REGION ON SUNDAY. IN THE EXTENDED FORECAST AN UPPER LEVEL TROUGH WILL DEVELOP OVER THE NORTHEAST CONUS. && .NEAR TERM /UNTIL 6 AM SATURDAY MORNING/... A WAVY FRONTAL BOUNDARY STRETCHED ACROSS CENTRAL PENN... ALONG OR JUST TO THE NORTH OF INTERSTATE 80 LATE TODAY. THIS FRONT WILL ACT AS THE FOCUS FOR AT LEAST A FEW ROUNDS OF SHOWERS AND SOME POTENTIALLY TRAINING TSRA LATE TODAY THROUGH EARLY TONIGHT. A FEW OF THE STORMS COULD BRIEFLY EXCEED SVR LIMITS FOR HAIL AND MICROBURST WIND GUSTS. HOWEVER...THE MODERATE CAPES...NOTABLY LESS 0-1 KM SHEAR THAN THURSDAY...AND A HIGH -20C LEVEL OF ABOUT 26 KFT AGL WILL LIKELY KEEP MOST OF THE UPDRAFTS JUST STRONG ENOUGH FOR PEA TO MARBLE SIZE HAIL AND 30-40 KTS GUSTS. COORDINATED WITH WFO PBZ TO POST A FLASH FLOOD WATCH FOR SEVERAL OF OUR WRN COUNTIES THROUGH 08Z SATURDAY WHERE THE BEST LLVL THETA-E CONVERGENCE...AND INCREASING DYNAMICS ALOFT WILL COMBINE WITH RELATIVELY LOWER FLASH FLOOD GUIDANCE OF AROUND 1.5 IN/6 HOUR TO BRING THE THREAT OF SMALL STREAM/LOW LYING FLOODING FROM TRAINING TSRA. A POTENT UPPER SHORT WAVE WILL BE TRACKING ESE FROM LAKE MICHIGAN LATER TONIGHT THROUGH SATURDAY HELPING TO BRING ADDITIONAL SCATTERED SHOWERS AND TSRA EARLY SATURDAY. MINS TONIGHT WILL RANGE FROM THE UPPER 50S ACROSS THE NORTH TO NEAR 70F IN THE SE ZONES. && .SHORT TERM /6 AM SATURDAY MORNING THROUGH 6 PM SATURDAY/...NEARLY A REPEAT OF FRIDAY/S WEATHER LOOKS IN STORE FOR SATURDAY...THOUGH THE COVERAGE OF MORNING SHOWERS MAY BE A LITTLE GREATER AS THE UPPER TROUGH APPROACHES FROM OHIO. NUMEROUS SHRA/TSRA APPEAR TO BE IN THE PICTURE FOR SATURDAY...AND DIURNAL HEATING WILL ENHANCE THE COVERAGE OF SHRA/TSRA BY THE AFTN...WITH LIKELY POPS CONTINUING TO BE SUPPORTED BY SREF DATA OVR MUCH OF THE AREA. DESPITE MCLDY SKIES...TEMPS SHOULD STILL REACH WELL INTO THE 80S IN THE VALLEYS...AS PA WILL REMAIN IN WARM/HUMID AIR MASS SOUTH OF QUASI-STATIONARY FRONTAL BNDRY ALONG THE PA/NY BORDER. SVR WX THREAT APPEARS FAIRLY LOW SAT AFTN...GIVEN WEAK SHEAR AND ONLY MODEST CAPES INDICATED BY MDLS. && .LONG TERM /SATURDAY NIGHT THROUGH FRIDAY/... UPPER TROF AXIS SWINGS EAST OF PENNSYLVANIA SATURDAY NIGHT AND EARLY SUNDAY BRINGING A BRIEF RESPITE FROM THE DAILY DIURNAL CHANCES OF SHOWERS AND THUNDERSTORMS ACROSS CENTRAL PA. DEEPER LAYER MOISTURE RETURNS LATER MONDAY AS THE UPPER FLOW BUCKLES FROM THE WSW ONCE AGAIN...AND MUCH OF NEXT WEEK APPEARS TO BE UNSETTLED WITH AT LEAST SLGT CHC TO CHC OF DAILY SHOWERS AND THUNDERSTORMS SCATTERED ABOUT EACH AFTERNOON. WED MAY BE THE WETTEST DAY AS UPPER TROF SWINGING ACROSS THE NORTHERN GREAT LAKES PROVIDES THE BEST FOCUS FOR SHOWERS AND THUNDERSTORMS...ALONG WITH HINTED SFC LOW DEVELOPMENT ALONG THE MID ATLANTIC COASTLINE. A FAIR SPREAD IN THE GUIDANCE REMAINS FOR THE MIDDLE OF NEXT WEEK SO HAVE JUST BROAD-BRUSHED MID CHANCE POPS SIMILAR TO SURROUNDING OFFICES FOLLOWED BY DECREASING POPS FOR LATER IN THE WEEK. STRONG UPPER RIDGE REMAINS OVER THE FOUR CORNERS REGION WHILE MEAN UPPER TROF REMAINS OVER THE GREAT LAKES NEXT THU AND FRI...KEEPING AT LEAST SLIGHT CHC POPS IN THE PICTURE THROUGH THE END OF THE WEEK. NEAR PERSISTENCE FORECAST FOR MOST OF THE EXTENDED PERIOD && .AVIATION /20Z FRIDAY THROUGH WEDNESDAY/... KBFD ASOS POWER/DATA LOSS PROBLEM CONTINUES /DUE TO STORMS THU AFT/. FAA AND NWS TECHNICIANS WILL BE TEAMING UP TO HOOK UP A GENERATOR TO MAINTAIN THE CONTINUITY OF THE OBSERVATION BETWEEN 6 AM AND 10 PM EDT. PARTIAL OBSERVATION RECEIVED AT 1953Z WITH CIG/PRES WEATHER STILL MISSING ATTM. MAINLY VFR...WITH AREAS OF MVFR CIGS AND VSBYS IN TSRA NEAR AND TO THE NORTH OF INTERSTATE 80 AT 21Z WILL SLOWLY DEVELOP SWD THIS EVENING. CONDITIONS WILL FALL TO MAINLY VFR IN LIGHT FOG/HZ OVERNIGHT...WITH ISOLATED IFR CIGS/VSBYS IN TSRA...OR FOG. A SLOW MOVING COLD FRONT OVER THE NRN MTNS OF PENN WILL PUSH SOUTH ACROSS THE STATE LATE TODAY INTO SAT. SCT CONVECTION WILL OCCUR AGAIN SAT....ESPECIALLY AFTER 18Z. OUTLOOK... SAT...AM FOG. SCT MAINLY AFTERNOON TSRA W LOCAL IMPACTS. SUN...AM FOG POSSIBLE. OTHERWISE VFR. MON...ISOLD PM TSRA IMPACTS POSSIBLE. TUE AND WED...MVFR POSS WITH RAIN SHOWERS AND SCTD TSRA. && .CTP WATCHES/WARNINGS/ADVISORIES... FLASH FLOOD WATCH THROUGH LATE TONIGHT FOR PAZ010-017-024-033. && SYNOPSIS...LAMBERT NEAR TERM...LAMBERT SHORT TERM...LAMBERT LONG TERM...DEVOIR/FITZGERALD AVIATION...LAMBERT
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA 439 PM EDT FRI JUL 27 2012 PAZ004>006-011-012-018-019-025>028-034>037-041-042-045-046-049>053- 056>059-063-064-282045- WARREN-MCKEAN-POTTER-CAMERON-NORTHERN CLINTON-NORTHERN CENTRE- SOUTHERN CENTRE-BLAIR-HUNTINGDON-MIFFLIN-JUNIATA-BEDFORD-FULTON- FRANKLIN-TIOGA-NORTHERN LYCOMING-SULLIVAN-SOUTHERN CLINTON- SOUTHERN LYCOMING-UNION-SNYDER-MONTOUR-NORTHUMBERLAND-COLUMBIA-PERRY- DAUPHIN-SCHUYLKILL-LEBANON-CUMBERLAND-ADAMS- 439 PM EDT FRI JUL 27 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...TONIGHT. SCATTERED STRONG THUNDERSTORMS WILL FORM THIS AFTERNOON ALONG AND AHEAD OF A SLOW MOVING COLD FRONT...THAT WILL BE DRIFTING SOUTHEAST ACROSS THE STATE. SOME OF THE STORMS WILL CONTAIN GUSTY WINDS OF 40 TO 50 MPH...SMALL HAIL...AND FREQUENT CLOUD TO GROUND LIGHTNING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. PAZ065-066-282045- YORK-LANCASTER- 439 PM EDT FRI JUL 27 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...TONIGHT. THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND THIS EVENING. THE PRIMARY SEVERE WEATHER THREAT WILL BE IN THE FORM OF LOCALIZED DOWNBURST WIND GUSTS AROUND 60 MPH...AND HAIL UP TO ONE INCH IN DIAMETER. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME. PAZ010-017-024-033-282045- ELK-CLEARFIELD-CAMBRIA-SOMERSET- 439 PM EDT FRI JUL 27 2012 ...FLASH FLOOD WATCH IN EFFECT UNTIL 4 AM EDT SATURDAY... THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...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. SCATTERED STRONG THUNDERSTORMS WILL FORM THIS AFTERNOON ALONG AND AHEAD OF A SLOW MOVING COLD FRONT. THAT FRONT WILL BE DRIFTING SOUTHEAST ACROSS THE STATE AND COULD ALLOW FOR HEAVY DOWNPOURS WHICH MAY LEAD TO POSSIBLE FLOODING. SOME OF THE STORMS WILL CONTAIN GUSTY WINDS OF 40 TO 50 MPH...SMALL HAIL...AND FREQUENT CLOUD TO GROUND LIGHTNING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT EXPECTED AT THIS TIME.
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
215 PM EDT FRI JUL 27 2012
PAZ006-010>012-271930-
CAMERON PA-ELK PA-NORTHERN CLINTON PA-POTTER PA-
215 PM EDT FRI JUL 27 2012
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT CENTRAL
CAMERON...ELK...NORTHWESTERN CLINTON AND SOUTH CENTRAL POTTER
COUNTIES THROUGH 330 PM EDT...
AT 211 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM ELK
RIVER TO LYNCH TO TIONESTA...MOVING TO THE EAST SOUTHEAST AT 30 MPH.
WIND GUSTS TO 45 MPH AND MARBLE TO PENNY SIZE HAIL ARE POSSIBLE WITH
THE THESE STORMS. EXPECT FREQUENT...DANGEROUS CLOUD TO GROUND
LIGHTNING FROM THESE STORMS. DO NOT STAY IN THE OPEN NOR SEEK
SHELTER UNDER TREES WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN A
THUNDERSTORM APPROACHES. THESE STORMS WILL AFFECT EAST BRANCH
DAM...PORTLAND MILLS...RIDGWAY...ST. MARYS AND TRUMAN.
THIS WILL IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 219...STATE ROAD
66...STATE ROAD 120...STATE ROAD 255.
LAT...LON 4143 7907 4145 7907 4145 7897 4160 7896
4160 7840 4149 7787 4139 7793 4135 7821
4124 7853 4125 7864 4123 7865 4124 7875
4127 7876 4137 7897 4135 7902 4134 7910
4142 7910
FORECASTER: LAMBERTSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
318 PM EDT FRI JUL 27 2012
PAZ004-272015-
WARREN PA-
318 PM EDT FRI JUL 27 2012
...A FEW STRONG THUNDERSTORMS WILL AFFECT NORTHERN WARREN COUNTY
THROUGH 415 PM EDT...
AT 315 PM EDT...TWO STRONG THUNDERSTORMS WERE LOCATED FROM COLUMBUS
TO YOUNGSVILLE...MOVING NORTHEAST AT 25 MPH.
WIND GUSTS TO 50 MPH AND PENNY SIZE HAIL ARE POSSIBLE WITH THESE
STORMS. EXPECT FREQUENT...DANGEROUS CLOUD TO GROUND LIGHTNING FROM
THESE STORMS. DO NOT STAY IN THE OPEN NOR SEEK SHELTER UNDER TREES
WHEN LIGHTNING THREATENS...MOVE INDOORS WHEN A THUNDERSTORM
APPROACHES. THESE STORMS WILL AFFECT BEAR LAKE...SUGAR GROVE AND
RUSSELL.
THIS WILL IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 6...ROUTE 62.
LAT...LON 4200 7892 4196 7893 4182 7928 4175 7959
4180 7963 4181 7963 4181 7962 4188 7962
4200 7961
FORECASTER: LAMBERTPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
346 PM EDT FRI JUL 27 2012
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0340 PM HAIL CHANDLERS VALLEY 41.93N 79.30W
07/27/2012 M0.70 INCH WARREN PA CO-OP OBSERVER
HEAVY RAIN
&&
EVENT NUMBER CTP1200337
MACHSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
346 PM EDT FRI JUL 27 2012
PAZ041-042-046-272045-
NORTHERN LYCOMING PA-SOUTHERN LYCOMING PA-SULLIVAN PA-
346 PM EDT FRI JUL 27 2012
...A STRONG THUNDERSTORM WILL AFFECT CENTRAL LYCOMING AND
SOUTHWESTERN SULLIVAN COUNTIES THROUGH 445 PM EDT...
AT 340 PM EDT...A STRONG THUNDERSTORM WAS NEAR TROUT RUN...MOVING
EAST SOUTHEAST AT 15 MPH.
WIND GUSTS TO 45 MPH AND MARBLE SIZE HAIL ARE POSSIBLE WITH THIS
STORM. THIS STORM WILL AFFECT COGAN
STATION...LOYALSOCKVILLE...BARBOURS...BARBOURS AND PICTURE ROCKS.
THIS WILL IMPACT I-180 BETWEEN MILE MARKERS 15 AND 21.
THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 15...ROUTE
220...STATE ROAD 14...STATE ROAD 118.
LAT...LON 4144 7654 4120 7667 4133 7724 4141 7718
4147 7705
FORECASTER: LAMBERTSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
355 PM EDT FRI JUL 27 2012
PAZ011-012-017>019-024-045-272030-
CAMBRIA PA-CAMERON PA-CLEARFIELD PA-NORTHERN CENTRE PA-
NORTHERN CLINTON PA-SOUTHERN CENTRE PA-SOUTHERN CLINTON PA-
355 PM EDT FRI JUL 27 2012
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT CLEARFIELD...
NORTHEASTERN CAMBRIA...SOUTHEASTERN CAMERON...WESTERN CENTRE AND
WESTERN CLINTON COUNTIES...
AT 353 PM EDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM
WESTPORT TO LECONTES MILLS TO MAHAFFEY...MOVING SOUTHEAST AT 30 MPH.
WIND GUSTS TO 40 MPH ARE POSSIBLE WITH THESE STORMS. THESE STORMS
WILL AFFECT RENOVO...HYNER...SNOW SHOE AND BALD EAGLE STATE PARK.
THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...
I-80 BETWEEN MILE MARKERS 114 AND 157...I-99 BETWEEN MILE MARKERS 61
AND 67.
THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 219...ROUTE
220...ALTERNATE ROUTE 220...ROUTE 322...STATE ROAD 120...STATE ROAD
350.
LAT...LON 4114 7747 4081 7800 4074 7820 4073 7836
4072 7835 4066 7839 4063 7848 4090 7882
4096 7881 4112 7839 4145 7785
FORECASTER: JUNGSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
420 PM EDT FRI JUL 27 2012
PAZ041-042-046-051>053-272115-
COLUMBIA PA-MONTOUR PA-NORTHERN LYCOMING PA-NORTHUMBERLAND PA-
SOUTHERN LYCOMING PA-SULLIVAN PA-
420 PM EDT FRI JUL 27 2012
...A LINE OF STRONG THUNDERSTORMS WILL AFFECT LYCOMING...NORTHERN
MONTOUR...NORTHWESTERN COLUMBIA...NORTHWESTERN NORTHUMBERLAND AND
SOUTHERN SULLIVAN COUNTIES THROUGH 515 PM EDT...
AT 416 PM EDT...SEVERAL STRONG THUNDERSTORMS WERE LOCATED ALONG A
LINE FROM PICTURE ROCKS TO TROUT RUN...MOVING SOUTHEAST AT 25 MPH.
WIND GUSTS TO 45 MPH AND PENNY SIZE HAIL ARE POSSIBLE WITH THESE
STORMS. THESE STORMS WILL AFFECT LAIRDSVILLE...BIGGERTOWN...
WILLIAMSPORT...MILLVILLE...ORANGEVILLE AND TURBOTVILLE.
THIS WILL IMPACT I-180 BETWEEN MILE MARKERS 1 AND 29.
THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 15...ROUTE
220...STATE ROAD 14...STATE ROAD 118.
LAT...LON 4110 7634 4102 7648 4105 7686 4114 7690
4115 7696 4113 7697 4113 7703 4129 7725
4149 7735 4145 7693 4145 7663 4131 7649
FORECASTER: LAMBERTThe State College radar (KCCX), 15 km away, was scanning. The volume nearest the first event began at 20:54 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds estimated near 60 mph knocked down trees in Benner Township near Bellefonte.
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: 386948.