A trough over the Great Lakes/Ohio Valley progressed slowly east across the Mid-Atlantic and New England states during the afternoon and evening hours. Meanwhile at lower levels, a secondary cold frontal surge crossed the central Appalachians triggering another round of diurnal storms.
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.
A trough over the Great Lakes/Ohio Valley progressed slowly east across the Mid-Atlantic and New England states during the afternoon and evening hours. Meanwhile at lower levels, a secondary cold frontal surge crossed the central Appalachians triggering another round of diurnal storms. Strong heating of a very moist, high PW airmass along with moderate deep shear and sufficient large scale forcing promoted organized thunderstorm clusters/bands which produced numerous reports of damaging winds and isolated, marginally severe hail.
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 3, 9:22 AM EST, 1 hour 58 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 1022 AM EDT THU JUL 3 2014 .SYNOPSIS... A SLOW MOVING COLD FRONT WILL INTERACT WITH A PLUME OF DEEP MOISTURE TO THE NORTH OF HURRICANE ARTHUR TO FUEL THE DEVELOPMENT OF NUMEROUS SHOWERS AND THUNDERSTORMS TODAY INTO EARLY TONIGHT. HIGH PRESSURE ACCOMPANIED BY COOLER AND LESS HUMID CONDITIONS WILL BRING A VERY COMFORTABLE AND DRY 4TH OF JULY HOLIDAY WEEKEND. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... MUCH OF THE CWA IS QUIET AS OF MID MORNING...WITH THE EXCEPTION BEING THE FAR NW WHERE AN AREA OF SHOWERS IS MOVING ACROSS. THE BROAD SLOW-MOVING COLD FRONT IS HARD TO FIND...BUT THE MESO- ANAL SUGGESTS IT IS OVER WESTERN PA. THIS WILL ACT TO ENHANCE LOW LEVEL CONVERGENCE AND EVENTUAL CONVECTIVE DEVELOPMENT LATER THIS MORNING AND AFTERNOON. BIGGEST ISSUE IS WHERE THIS BOUNDARY WILL SET UP AS THE MOISTURE FROM ARTHUR STREAMS NEWD UP THE EASTERN SEABOARD. FROM EARLIER... THE WESTERN EDGE OF SPC/S SLIGHT RISK AREA EXTENDS FROM AROUND WELLSBORO...SSW TO RENOVO...STATE COLLEGE ALTOONA AND BEDFORD. A PLUME OF ANOMALOUSLY HIGH PWAT AIR OF 1.5 TO 2 INCHES WILL PREVAIL TODAY INTO THIS EVENING ACROSS THE EASTERN HALF OF THE CWA. THE ADDED THREAT TO TODAY/S STORMS WILL BE AN ENHANCED POTENTIAL FOR FLASH FLOODING FROM NEWD MOVING/TRAINING TSRA...AS INCREASING DEEP LAYERED IS GENERATED/MOVES EAST BENEATH THE RIGHT ENTRANCE REGION OF A STRONG SSWRLY UPPER LEVEL JET /STRETCHED FROM THE OHIO VALLEY TO SERN CANADA/. LOCALIZED RAINFALL OF UP TO 2 INCHES IN LESS THAN AN HOUR COULD EASILY OCCUR ACROSS PARTS OF CENTRAL AND EASTERN PENN...ALTHOUGH BASIN AVERAGE AMOUNTS WILL BE OBVIOUSLY MUCH LOWER AND GENERALLY BETWEEN 4 AND 8 TENTHS OF AN INCH BY DUSK. A FLASH FLOOD WATCH HAS BEE POSTED FOR THE EASTERN HALF OF OUR CWA BEGINNING AT 17Z TODAY...AND CONTINUING UNTIL 01Z FOR MUCH OF THE REGION /EXCEPT FOR THE FAR SE WHERE THE WATCH EXPIRES AT 04Z FRIDAY. 03/03Z SREF PROB OF CAPE EXCEEDING 1000 J/KG IS BASICALLY A GIVEN TODAY ACROSS THE EASTERN HALF OF THE STATE...WHILE THE PROB OF CAPE EXCEEDING 2000 J/KG IS BETWEEN 30-50 PERCENT NEAR AND TO THE EAST OF THE SUSQ VALLEY. 0-1 KM SWRLY BULK SHEAR OF 20 KTS...AND 0-1 KM EHI OF 1 M2/S2 OR GREATER IS LOCATED OVER AND TO THE EAST OF THE SUSQ MAINSTEM THIS AFTERNOON AND EARLY THIS EVENING...AND THAT/S THE MOST LIKELY PLACE THAT WE/LL SEE THE THREAT FOR SVR TSRA /SIMILAR TO WHERE THE STRONGEST STORMS OCCURRED YESTERDAY/. HIGH TEMPS THIS AFTERNOON WILL VARY FROM THE MUCH MORE COMFORTABLE MID 70S ACROSS THE NW MTNS...TO THE MID AND UPPER 80S ACROSS THE SOUTHERN AND EASTERN VALLEYS. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM FRIDAY/... IMPROVING CONDITIONS WILL DEVELOP FOR LATER TODAY /ACROSS THE WEST/...AND LATE TONIGHT IN THE FAR EAST THU INTO FRIDAY AS THE FRONT EDGES EAST OF THE CWA. HOWEVER...SOME SOME SHOWERS SHOULD LINGER ACROSS THE FAR EAST AFTER MIDNIGHT TONIGHT. COOLER AIR MOVING INTO THE REGION TONIGHT ON A 4-8 KT WNWRLY BREEZE SHOULD BE ACCOMPANIED BY A FAIR AMOUNT OF CLOUDS...SO FOG SHOULD BE ON THE PATCHY LIGHT SIDE IN MOST PLACES. LOW TEMPS TONIGHT WILL RANGE FROM THE LOWER 50S ACROSS THE NW MTNS...TO MID AND UPPER 60S ACROSS THE CENTRAL AND LOWER SUSQ VALLEY. INDEPENDENCE DAY SHOULD SHINE IN ALL OF IT/S GLORY THANKS TO A LARGE AREA OF HIGH PRESSURE BUILDING IN AND PROVIDING INCREASING SUNSHINE BUT DECREASING /AND VERY REFRESHING/ DEWPOINTS IN THE 40S NW AND 50S ACROSS THE SE. AFTERNOON HIGH TEMPS WILL BE IN THE LOWER TO MID 70S ACROSS THE NORTHERN AND WESTERN MTNS...AND UPPER 70S IN THE SE. && .LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/... WILL HAVE TO MONITOR THE AMOUNT OF CLDS FOR FRIDAY NIGHT INTO SAT...GETTING CONCERN ABOUT HOW MUCH COOL AIR IS ADVECTED SE ACROSS THE LAKES. EXPECT A NICE DAY ON SUNDAY. WENT WITH LOW CHC POPS ACROSS THE NORTH ON MONDAY...THEN ALL AREAS FOR TUE INTO WED...AS EC AND OTHER MODELS HINT AT A WEAK FRONT DROPPING SOUTHWARD. && .AVIATION /14Z THURSDAY THROUGH MONDAY/... TERMINALS ARE VFR AS OF MID MORNING. HUMID AIR REMAINS IN PLACE OVER THE AREA DAY WITH POTENTIAL REDUCTIONS DUE TO ANOTHER ROUND OF THUNDERSTORMS EXPECTED THIS AFTERNOON AND EVENING. DUE TO THE VARIABILITY OF THE TIMING...HAVE LEFT THE MENTION OF THUNDER OUT OF THE TERMINALS FOR NOW. ANY SITE THAT RECEIVES PRECIPITATION THIS AFTERNOON OR EARLY EVENING WILL HAVE AN ELEVATED CHANCE FOR LOW CLOUDS/PATCHY FOG TONIGHT INTO FRIDAY MORNING. OVERALL LOOK FOR IMPROVING CONDS TONIGHT WITH PREDOMINATELY VFR FLYING FRI INTO THE WEEKEND. OUTLOOK... FRI-EARLY SUN...VFR. LATE SUN-MON...CHANCE REDUCTIONS WITH SCATTERED SHOWERS AND THUNDERSTORMS. && .CTP WATCHES/WARNINGS/ADVISORIES... FLASH FLOOD WATCH UNTIL 9 PM EDT THIS EVENING FOR PAZ028-036- 037-041-042-046-049>053-056-063-064. FLASH FLOOD WATCH THROUGH THIS EVENING FOR PAZ057>059-065-066. && SYNOPSIS...LA CORTE/LAMBERT NEAR TERM...LA CORTE/LAMBERT SHORT TERM...LAMBERT/MARTIN LONG TERM...LAMBERT/MARTIN AVIATION...LA CORTE/CERU
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE STATE COLLEGE PA 339 AM EDT THU JUL 3 2014 PAZ004-005-010-040745- WARREN-MCKEAN-ELK- 339 AM EDT THU JUL 3 2014 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. PAZ006-011-012-017>019-024>027-033>035-045-040745- POTTER-CAMERON-NORTHERN CLINTON-CLEARFIELD-NORTHERN CENTRE- SOUTHERN CENTRE-CAMBRIA-BLAIR-HUNTINGDON-MIFFLIN-SOMERSET-BEDFORD- FULTON-SOUTHERN CLINTON- 339 AM EDT THU JUL 3 2014 THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL PENNSYLVANIA. .DAY ONE...TODAY AND TONIGHT. A SLOW MOVING COLD FRONT WILL TEAM UP WITH A POTENT UPPER AIR DISTURBANCE AND ABUNDANT MOISTURE TO BRING A FEW ROUNDS OF HEAVY SHOWERS...AND SCATTERED STRONG TO POTENTIALLY SEVERE THUNDERSTORMS THIS AFTERNOON INTO EARLY THIS EVENING. THE SLIGHT RISK FOR SEVERE THUNDERSTORMS IS MAINLY TO THE EAST OF A LINE FROM BEDFORD AND ALTOONA...TO STATE COLLEGE...RENOVO AND WELLSBORO. SOME OF THE STORMS COULD CONTAIN LOCALIZED DAMAGING WIND GUSTS AND HAIL AROUND ONE INCH IN DIAMETER. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. PAZ028-036-037-041-042-046-049>053-056-063-064-040745- JUNIATA-FRANKLIN-TIOGA-NORTHERN LYCOMING-SULLIVAN-SOUTHERN LYCOMING- UNION-SNYDER-MONTOUR-NORTHUMBERLAND-COLUMBIA-PERRY-CUMBERLAND-ADAMS- 339 AM EDT THU JUL 3 2014 ...FLASH FLOOD WATCH IN EFFECT FROM 1 PM EDT THIS AFTERNOON THROUGH THIS EVENING... 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. SOME OF THE STORMS COULD CONTAIN LOCALIZED DAMAGING WIND GUSTS AND HAIL AROUND ONE INCH IN DIAMETER. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. PAZ057>059-065-066-040745- DAUPHIN-SCHUYLKILL-LEBANON-YORK-LANCASTER- 339 AM EDT THU JUL 3 2014 ...FLASH FLOOD WATCH IN EFFECT FROM 1 PM EDT THIS AFTERNOON THROUGH THIS EVENING... 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. SOME OF THE STORMS COULD CONTAIN LOCALIZED DAMAGING WIND GUSTS AND HAIL AROUND ONE INCH IN DIAMETER. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY. THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES. LAMBERT
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE STATE COLLEGE PA
1203 PM EDT THU JUL 3 2014
PAZ017-024-031645-
CLEARFIELD PA-CAMBRIA PA-
1203 PM EDT THU JUL 3 2014
...A STRONG THUNDERSTORM WILL IMPACT NORTHERN CAMBRIA AND SOUTHERN
CLEARFIELD COUNTIES...
AT 1202 PM EDT...DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER
COMMODORE...MOVING EAST AT 30 MPH.
NICKEL SIZE HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH
THIS STORM.
THIS STRONG THUNDERSTORM WILL BE NEAR...
CHERRY TREE AND NORTHERN CAMBRIA AROUND 1220 PM EDT.
OTHER LOCATIONS IMPACTED BY THIS STORM INCLUDE RAMEY...IRVONA...GLEN
HOPE...NEW WASHINGTON...WESTOVER...MAHAFFEY...BURNSIDE...LUMBER
CITY...COALPORT AND CHERRY TREE.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM.
LIGHTNING CAN STRIKE 15 MILES AWAY FROM A THUNDERSTORM. SEEK A SAFE
SHELTER INSIDE A BUILDING OR VEHICLE.
THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR LOCAL RADIO AND
TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR ADDITIONAL
INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.
&&
LAT...LON 4072 7881 4072 7880 4088 7881 4101 7846
4078 7834 4077 7835 4075 7838 4063 7885
TIME...MOT...LOC 1602Z 248DEG 28KT 4072 7895
STEINBUGLThe State College radar (KCCX), 61 km away, was scanning. The volume nearest the first event began at 16:17 UTC.
20 thunderstorm wind, 1 hail. Local standard time, as filed.
Thunderstorm winds estimated near 60 mph knocked down trees in Mahaffey.
Thunderstorm winds estimated near 60 mph knocked down trees in Kellytown.
Thunderstorm winds estimated near 60 mph knocked down large tree limbs and wires in Martinsburg.
Thunderstorm winds estimated near 60 mph knocked down trees near Spruce Creek.
Thunderstorm winds estimated near 60 mph knocked down trees near Mapleton.
Thunderstorm winds estimated near 60 mph knocked down trees in Mill Creek.
Thunderstorm winds estimated near 60 mph knocked down trees in Lock Haven.
The Williamsport Regional Airport ASOS measured a peak thunderstorm wind gust of 66 mph.
Thunderstorm winds estimated near 60 mph knocked down trees around Williamsport.
Thunderstorm winds estimated near 60 mph knocked down trees in Mifflintown.
Thunderstorm winds estimated near 60 mph knocked down trees and wires near Keffers. A roof was also blown off a commercial building in Hegins Township.
Thunderstorm winds estimated near 60 mph knocked down trees in Montoursville.
Half-dollar size hail (1.25 inch diameter) was reported in Mount Carmel.
Thunderstorm winds estimated near 60 mph knocked down trees in several locations across the southern part of the county.
Thunderstorm winds estimated near 60 mph knocked down trees in Millerstown.
Thunderstorm winds estimated near 60 mph knocked down trees in Beavertown.
Thunderstorm winds estimated near 60 mph knocked down trees in Muncy Valley.
Thunderstorm winds estimated near 60 mph knocked down trees in Mildred.
Thunderstorm winds estimated near 60 mph knocked down trees in Danville.
Thunderstorm winds estimated near 60 mph knocked down trees in Butler and Mahanoy Townships near Frackville.
Thunderstorm winds estimated near 60 mph knocked down trees in Lower Chanceford and Peach Bottom Townships. Widespread power outages were reported in both townships.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2014Every state in 2014This day in weather historyWarnings in Pennsylvania, July 2014
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: 521045, 521046, 521047, 521048, 521049, 521051, 521052, 521053, 521054, 521056, 521057, 521058, 521059, 521060, 521061, 521062, 521063, 521064, 521065, 521066, 521067.