A shortwave trough in a warm and humid air mass allowed for convection across western Pennsylvania to continue tracking eastward across central Pennsylvania during the evening hours of July 15, 2024. Scattered instances of severe thunderstorm wind damage across mainly the northern tier and the Middle Susquehanna Valley occurred before continuing further east into eastern Pennsylvania during the…
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 shortwave trough in a warm and humid air mass allowed for convection across western Pennsylvania to continue tracking eastward across central Pennsylvania during the evening hours of July 15, 2024. Scattered instances of severe thunderstorm wind damage across mainly the northern tier and the Middle Susquehanna Valley occurred before continuing further east into eastern Pennsylvania during the evening hours.
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 15, 2:02 PM EST, 33 minutes earlier.
Area Forecast Discussion National Weather Service State College PA 302 PM EDT Mon Jul 15 2024 .SYNOPSIS... The heat will continue as unseasonably warm air is directed into the state on SW winds. A compact but potent upper level disturbance and strong winds aloft will bring a round of strong to severe thunderstorms that will be focused across Central PA and the Mid Susquehanna Valley later this afternoon and evening. Additional storms with gusty winds and hail will move through in the afternoon and evening Tuesday. A cold front will push through late Wednesday with another round of strong to severe thunderstorms. High pressure will build in from the Great Lakes and control things for the rest of the week. && .NEAR TERM /UNTIL 11 PM THIS EVENING/... SVR watch in effect until 7 PM for the nrn half of the CWA as 0-6km shear climb into the 35-40kt range and MLCAPEs go as high as 1500-2000J. CI already happened over the NW on the leading edge of the best forcing of an MCV from overnight convection. A second shortwave trough - looking for all the world like a hurricane - over OH has also started to pop deep convection in wrn PA. A couple of TSRA should pop up in other seemingly random locations, too as broad lift is underway in advance of the general upper trough to our west. The convection is expected to be through IPT/UNV well before dark, and continue SEwrd. However, the loss of the best heating should diminish the punch of the storms. We may end up expanding the watch a bit more to the S and E or hook up with a subsequent watch for ern PA a little later this aftn if things develop on schedule. Main threat today is damaging wind, but some hail is possible, mainly in the NW. All heat flags looking solid with only minor/small changes to temps/dews in the very near term. && .SHORT TERM /11 PM THIS EVENING THROUGH TUESDAY NIGHT/... Left over convection should dwindle early tonight. The SW flow just above the blyr will bring thick mstr/low clouds into the Alleghenies overnight. This should keep temps up. The clouds may be thick enough to make a little DZ, too. To the SE of the Allegheny Front, the clouds will be more sct and higher-based with not much in the way of low clouds to the SE of Blue Mountain. Still, even without thicker cloud cover, mins won't drop past 70F in most places, and maybe not <75F in the cities of the Lower Susq. Thus, the heat advy and warning have been allowed to continue. We've even added a heat advy for Wed to the going suite of products as temps/dews remain high, but not quite as high as Mon/Tues thanks to extra cthat we'll keep away from mentions in the TAFs at this point. We may add details as confidence increases in timing as the storms near.louds and anticipated cfropa. Tues still looks like the hottest/highest-heat-index day. A round of at organized severe convection is expected Tuesday PM ahead of cold front pressing slowly southeast through the Great Lakes and into PA later Tues night. && .LONG TERM /WEDNESDAY THROUGH MONDAY/... All medium range guidance supports a return to fair and seasonable weather with much lower humidity late in the week, as high pressure builds southeast from the Grt Lks. Will maintain just a slight chance of convection along the southern tier Thursday to account for some uncertainty regarding how far the dying cold front makes it south of the Mason Dixon Line. The stalled front is likely to return northward next weekend, resulting in the return of diurnal convection, mainly over the southern counties. && .AVIATION /19Z MONDAY THROUGH SATURDAY/... SH/TSRA are popping up right on time with the heat of the day and arrival of significant forcing/higher winds aloft. The storms should pass thru BFD in the next couple of hours. More- random storms are also popping elsewhere, and will threaten MDT/LNS in the next few hrs, too. Much of the convection will die off after we lose heating and the best upper level forcing wanes/moves east of the area -- which should happen right around the same time this evening. Some stronger gusts will come out of those storms, but timing and probability of occurrence at any of the terminals is so difficult to pinpoint. We have added some expectations of timing of these storms using tempo groups. IFR cloud cover is likely for BFD tonight as the flow just aloft is SWrly and stronger than last night, and there could be a few patches of DZ. If rain does occur at UNV/IPT, there will be some fog as the sky should partially clear out. LLWS not strong enough to mention anywhere, with llvl flow above the decoupled boundary layer <30kts in most places. JST may be the only candidate for a WS mention. Expect more of the same for Tuesday, with good forcing arriving in the mid-day right at peak heating. Gusty winds are possible with those storms. A potent cold front crosses the area in the midweek and ushers in a cooler and drier airmass for late week. Outlook... Wed...Scattered SHRA/TSRA, with some brief IFR poss, mainly SE and mainly in the aftn/eve. Thu...AM SHRA poss SE, otherwise VFR. Fri-Sat...No sig wx. && .CTP WATCHES/WARNINGS/ADVISORIES... Heat Advisory until 8 PM EDT Tuesday for PAZ019-025>028-034- 035-045-046-049>053-058. Excessive Heat Warning until 8 PM EDT Tuesday for PAZ036-056- 057-059-063>066. Heat Advisory from 8 PM Tuesday to 8 PM EDT Wednesday for PAZ036-056-057-059-063>066. && SYNOPSIS...Lambert/Dangelo NEAR TERM...Dangelo SHORT TERM...Dangelo LONG TERM...Fitzgerald/Gartner AVIATION...Dangelo
Hazardous Weather Outlook National Weather Service State College PA 1223 PM EDT Mon Jul 15 2024 PAZ004>006-010>012-037-041-042-161630- Warren-McKean-Potter-Elk-Cameron-Northern Clinton-Tioga- Northern Lycoming-Sullivan- 1223 PM EDT Mon Jul 15 2024 ...SEVERE THUNDERSTORM WATCH 538 IN EFFECT UNTIL 7 PM EDT THIS EVENING... This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...This afternoon and tonight. Please listen to NOAA Weather Radio or go to weather.gov/StateCollege on the internet for more information about the following hazards. Severe Thunderstorm Watch. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Severe thunderstorms with damaging winds 60 mph or greater, heavy rain and large hail exceeding 1 inch in diameter are possible Tuesday afternoon and early Tuesday evening. .SPOTTER INFORMATION STATEMENT... Spotters are encouraged to report significant hazardous weather. PAZ017-018-024-033-161630- Clearfield-Northern Centre-Cambria-Somerset- 1223 PM EDT Mon Jul 15 2024 This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...This afternoon and tonight. Strong to severe thunderstorms with strong gusty winds, heavy rain and frequent lightning are possible through early this evening. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Severe thunderstorms with damaging winds 60 mph or greater, heavy rain and large hail exceeding 1 inch in diameter are possible Tuesday afternoon and early Tuesday evening. .SPOTTER INFORMATION STATEMENT... Spotters are encouraged to report significant hazardous weather. PAZ045-046-161630- Southern Clinton-Southern Lycoming- 1223 PM EDT Mon Jul 15 2024 ...HEAT ADVISORY NOW IN EFFECT UNTIL 8 PM EDT TUESDAY... ...SEVERE THUNDERSTORM WATCH 538 IN EFFECT UNTIL 7 PM EDT THIS EVENING... This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...This afternoon and tonight. Please listen to NOAA Weather Radio or go to weather.gov/StateCollege on the internet for more information about the following hazards. Heat Advisory. Severe Thunderstorm Watch. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Please listen to NOAA Weather Radio or go to weather.gov/StateCollege on the internet for more information about the following hazards. Heat Advisory. Severe thunderstorms with damaging winds 60 mph or greater, frequent cloud to ground lightning, heavy rain and large hail exceeding 1 inch in diameter are possible Tuesday afternoon and evening. .SPOTTER INFORMATION STATEMENT... Spotters are encouraged to report significant hazardous weather. PAZ019-049>053-058-161630- Southern Centre-Union-Snyder-Montour-Northumberland-Columbia- Schuylkill- 1223 PM EDT Mon Jul 15 2024 ...HEAT ADVISORY NOW IN EFFECT UNTIL 8 PM EDT TUESDAY... This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...This afternoon and tonight. Please listen to NOAA Weather Radio or go to weather.gov/StateCollege on the internet for more information about the following hazards. Heat Advisory. In addition, severe thunderstorms with damaging winds 60 mph or greater, frequent cloud to ground lightning, heavy rain and large hail are possible late this afternoon through this evening. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Please listen to NOAA Weather Radio or go to weather.gov/StateCollege on the internet for more information about the following hazards. Heat Advisory. Severe thunderstorms with damaging winds 60 mph or greater, frequent cloud to ground lightning, heavy rain and large hail exceeding 1 inch in diameter are possible Tuesday afternoon and evening. .SPOTTER INFORMATION STATEMENT... Spotters are encouraged to report significant hazardous weather. PAZ025>028-034-035-161630- Blair-Huntingdon-Mifflin-Juniata-Bedford-Fulton- 1223 PM EDT Mon Jul 15 2024 ...HEAT ADVISORY NOW IN EFFECT UNTIL 8 PM EDT TUESDAY... This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...This afternoon and tonight. Please listen to NOAA Weather Radio or go to weather.gov/StateCollege on the internet for more information about the following hazards. Heat Advisory. In addition, strong to severe thunderstorms with strong gusty winds, and brief heavy rain are possible late this afternoon through early this evening. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Please listen to NOAA Weather Radio or go to weather.gov/StateCollege on the internet for more information about the following hazards. Heat Advisory. Severe thunderstorms with damaging winds 60 mph or greater, frequent cloud to ground lightning, heavy rain and large hail exceeding 1 inch in diameter are possible Tuesday afternoon and evening. .SPOTTER INFORMATION STATEMENT... Spotters are encouraged to report significant hazardous weather. PAZ036-056-057-059-063>066-161630- Franklin-Perry-Dauphin-Lebanon-Cumberland-Adams-York-Lancaster- 1223 PM EDT Mon Jul 15 2024 ...EXCESSIVE HEAT WARNING NOW IN EFFECT UNTIL 8 PM EDT TUESDAY... ...HEAT ADVISORY IN EFFECT FROM 8 PM TUESDAY TO 8 PM EDT WEDNESDAY... This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...This afternoon and tonight. Please listen to NOAA Weather Radio or go to weather.gov/StateCollege on the internet for more information about the following hazards. Excessive Heat Warning. In addition, strong to severe thunderstorms with strong gusty winds, heavy rain and frequent lightning are possible, mainly late this afternoon and early this evening. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. Please listen to NOAA Weather Radio or go to weather.gov/StateCollege on the internet for more information about the following hazards. Excessive Heat Warning. Heat Advisory. Strong to severe thunderstorms with strong gusty winds, heavy rain and frequent lightning are possible once again Tuesday afternoon and evening. .SPOTTER INFORMATION STATEMENT... Spotters are encouraged to report significant hazardous weather.
Special Weather Statement
National Weather Service State College PA
322 PM EDT Mon Jul 15 2024
PAZ063-151945-
Cumberland PA-
322 PM EDT Mon Jul 15 2024
...A STRONG THUNDERSTORM WILL IMPACT CENTRAL CUMBERLAND COUNTY
THROUGH 345 PM EDT...
At 322 PM EDT, Doppler radar was tracking a strong thunderstorm over
Carlisle, moving east at 20 mph.
HAZARD...Wind gusts of 50 to 55 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to vegetation is
possible.
This strong thunderstorm will be near...
Boiling Springs and Mount Holly Springs around 325 PM EDT.
Other locations impacted by this storm include Penn State Dickinson
School Of Law and Messiah College.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 4009 7731 4025 7724 4019 7691 4018 7692
4017 7691 4016 7691 4016 7697 4015 7698
4015 7703 4003 7719
TIME...MOT...LOC 1922Z 291DEG 16KT 4015 7720
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...55 MPH
DangeloThe State College radar (KCCX), 67 km away, was scanning. The volume nearest the first event began at 19:37 UTC.
29 thunderstorm wind. Local standard time, as filed.
A severe thunderstorm with winds estimated near 60 mph knocked down large tree limbs with multiple smaller trees knocked down in the vicinity of Treasure Lake.
A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees onto Mountain Run Road west of Penfield.
A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees and wires throughout Saint Marys, with both lanes of West Benedict Street being closed for a period of time.
A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees and wires, blocking both lanes of Million Dollar Highway near the intersection of Fairview Road east of Kersey.
A severe thunderstorm producing winds estimated near 60 mph knocked down a tree into a residence in Weedville, with no injuries reported.
A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees and wires in York.
A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees and wires in Lower Windsor Township.
A severe thunderstorm producing winds estimated near 60 mph knocked down a tree across Phoenix Run Road near the intersection of Hoppe Road south-southwest of Clymer.
A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees and wires down onto State Route 249 southeast of Westfield.
A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees onto one lane of Monkey Run Road near the intersection of Leon Brown Road north of Keeneyville.
A severe thunderstorm producing winds estimated near 75 mph knocked down a tree into a residence with multiple trees and wires down around Osceola Township.
A severe thunderstorm producing winds estimated near 65 mph uprooted and snapped multiple trees east of Wellsboro.
A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees and wires in and around Middlebury Center.
A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees and wires down near Somers Lane.
A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees into wires along Cold Watertown Road north of Oval.
A severe thunderstorm producing winds estimated near 65 mph knocked down a tree into a residence in Jackson Township.
A severe thunderstorm producing winds estimated near 65 mph knocked down a tree onto a house on the north end of Williamsport.
A severe thunderstorm producing winds estimated near 65 mph knocked down a tree onto a house in South Williamsport.
A severe thunderstorm producing winds estimated near 80 mph knocked down multiple large trees with one crushing a football team shed. A set of metal bleachers were also knocked over and pushed twenty to thirty feet around one of the local ball fields behind the Little League World Series Complex in South Williamsport.
A severe thunderstorm producing winds estimated near 65 mph knocked down a tree onto a house northwest of Montoursville.
The Williamsport Regional Airport ASOS (KIPT) recorded a measure peak wind gust of 63 mph within a severe thunderstorm.
A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees and wires across Loyalsock Township.
A severe thunderstorm producing winds estimated near 60 mph knocked down a tree onto a house east of Warrensville.
A severe thunderstorm producing winds estimated near 80 mph knocked down multiple trees near the intersection of Church Street and State Route 154 north of Forksville.
A severe thunderstorm producing winds estimated near 70 mph knocked down multiple trees and wires along the 7300 block of Route 87, blocking the roadway northeast of Forksville.
A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees in Mildred.
A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees and wires in Sugarloaf Township, blocking several roadways throughout the township.
A severe thunderstorm producing winds estimated near 60 mph knocked down multiple trees and wires between Waller and Jamison City.
A severe thunderstorm with winds estimated near 60 mph knocked down multiple trees and wires around Benton.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2024Every state in 2024This day in weather historyWarnings in Pennsylvania, July 2024
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: 1194273, 1194274, 1194275, 1194279, 1194276, 1194297, 1194298, 1194300, 1194303, 1194305, 1194307, 1194309, 1194311, 1194313, 1194319, 1194314, 1194321, 1194322, 1194323, 1194325, 1194324, 1194327, 1194329, 1194331, 1194332, 1194333, 1194334, 1194335, 1194336.