A cold frontal passage during the evening hours of June 19, 2025 brought a broken line of showers and thunderstorms to central Pennsylvania in a moderately sheared and unstable environment. Ahead of the cold front, unstable conditions with ample moisture and shear in place allowed for multiple clusters of severe thunderstorms to form along the western mountains, and continue eastward as the…
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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 cold frontal passage during the evening hours of June 19, 2025 brought a broken line of showers and thunderstorms to central Pennsylvania in a moderately sheared and unstable environment. Ahead of the cold front, unstable conditions with ample moisture and shear in place allowed for multiple clusters of severe thunderstorms to form along the western mountains, and continue eastward as the evening progressed. One of these clusters moved northward from eastern Maryland into York and Lancaster counties, producing multiple instances of tree damage across southern portions of each county. A cluster of thunderstorms across Clearfield and Centre counties produced multiple instances of tree damage before continuing to cause isolated tree damage into the Middle Susquehanna Valley. The most widespread damage was observed in eastern Union County and northern Northumberland County, where more thunderstorms began to bow out and produce widespread straight-line wind damage.
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 Jun 19, 2:03 PM EST, 59 minutes earlier.
Area Forecast Discussion National Weather Service State College PA 303 PM EDT Thu Jun 19 2025 .SYNOPSIS... * Cold front passes through this evening with strong to severe thunderstorms possible particularly across the southeast half of central PA * Not as humid for the first day of summer on Friday with a couple of passing rain showers/isolated gusty thunderstorm across the N * Trending warmer over the weekend * Extreme heat risk Monday and Tuesday && .NEAR TERM /UNTIL 2 AM FRIDAY MORNING/... Early morning cloud deck over the west has hampered their warming, but plenty of breaks in the west at 18Z. best heating and CAPE and DCAPE are all to the west of a cluster of storms moving along the MD border. This cluster should increase in stregth as it moves through the Lower Susq, mainly S of the Turnpike. As that cluster and nearby cells slide east (by 21Z), a pre-frontal trough between that cluster and the advancing cold front may flare up per HRRR and RAP progs. Then, another round will start in the poorer environment as the front moves through. The severe threat is lower but non-zero over the west. The SE is where the punch is, and a SVR Thunderstorm Watch is on effect. Expect the front to be through State College by 6 PM and Lancaster by 9 PM. Wind gusts outside of thunderstorms could be 20-30KT. The threat for flash flooding is also non-zero, but lower today as compared to the last two days. The storm motions and lack of training profile should keep it that way. Pretty much only the areas that received heavy rain (>2") over the last two days are at risk for FF. && .SHORT TERM /2 AM FRIDAY MORNING THROUGH FRIDAY NIGHT/... Drying behind the front will be noticable with 55F dewpoints over most of the area just after midnight. All but the western mtns should clear out well. Upslope there will keep some lower clouds around into mid-morning. Mins tonight will be close to the dewpoints in the NW half and just 3-5F higher in the SE. So, there could be some fog, but wind and a small depression in the dewpoints will help it from becoming widespread. Friday will hold much drier airmass but some forcing in the northwest flow in the aftn could touch off sct SHRA and an isold TSRA over the nrn tier in the aftn. Maxes in the 75-85F range. && .LONG TERM /SATURDAY THROUGH THURSDAY/... First significant and extremely dangerous heat wave of the season expected to impact central PA... An expansive ridge will be centered over the Ohio Valley and Central Appalachians by late Sunday. Height anomalies at 500 mb and 250 mb will be in the +2-3 sigma range. Furthermore, the axis of the upper level ridge appears to give little chance of having some temporary cooling from ring of fire convection dropping SE into PA from the Glakes. A strong capping inversion (with mid level temps peaking in the 12-13C range over the weekend) will greatly limit and likely negate any airmass/orographic shower/thunderstorm chances to sub 15 pct for Sat- Mon. NAEFS guidance depicts a ~72 hour period of anomalous 500mb heights, 700mb temperatures, and 850/925mb specific humidity values (>99th percentile for this time of year). If such a forecast materializes, we could be looking at a several day stretch of extreme heat and humidity across the region. Monday looks to be the hottest day of the stretch, with highs currently forecast in the 90s for most of the area. Dewpoints in the mid 70s would push heat index values over 100F for most locations east of I-99 and south of I-80, with values approaching 105+ in the Lower Susquehanna Valley. The heat only decreases slightly toward the middle of next week with heights at the center of the 500mb level ridge falling by about 5-6 decameters and GEFS Mean temps in the 925-850 mb layer dipping by 1-2 deg C from Mon/Tue to Wed. PoPs increases into the 30-60 pct range Wed and Thu afternoons as a slow moving cold front approaches southern New York State and stability begins to erode. Although this forecast is still several days out and uncertainty remains, the fact that we have been in a stretch of relatively cool conditions means the quick switch into significant heat and humidity could exacerbate the risk for heat-related impacts. In addition to warm afternoon temperatures and heat index values, overnight lows will provide little to no relief from the heat. With the expected stretch of hot and humid conditions, those with heightened susceptibility to heat, such as young children, older adults, people with chronic medical conditions, and pregnant women, should prepare to limit time outdoors, wear light clothing, and drink plenty of water later this weekend and early next week. && .AVIATION /19Z THURSDAY THROUGH TUESDAY/... The main concern for today is showers and storms firing along multiple boundaries across the region. Expect showers and storms in the west associated with an approaching cold front, and in the far southeast associated with a prefrontal trough. Some of these storms will be strong to severe and may produce strong wind gusts, particularly in southeast PA (inclusive of LNS). Showers and thunderstorms will exit to the east after 00Z Friday and winds will become west-northwesterly behind the departing cold front. This will allow for MVFR ceilings to develop at BFD, JST, UNV, and possibly IPT, while skies begin to clear out to the southeast. By 06Z, BFD and possibly JST are most likely to see IFR ceilings, which will persist through the rest of the night. Conds generally improve through 15z Fri with VFR expected at all TAF sites. However, isolated to scattered showers and thunderstorms are possible again Fri mainly after 18z. Outlook... Sat-Tue...Mainly VFR. Hot. Slight chance of SHRA/TSRA late Sat and again on Tue. && .CLIMATE... Astronomical Summer (solstice) officially arrives on Friday, June 20, at 10:42 p.m. && .CTP WATCHES/WARNINGS/ADVISORIES... None. && SYNOPSIS...Dangelo/Steinbugl NEAR TERM...Dangelo SHORT TERM...Dangelo LONG TERM...Steinbugl/Colbert AVIATION...Colbert/Bauco CLIMATE...Steinbugl
Hazardous Weather Outlook National Weather Service State College PA 149 PM EDT Thu Jun 19 2025 PAZ036-051>053-056>059-063>066-201800- Franklin-Montour-Northumberland-Columbia-Perry-Dauphin-Schuylkill- Lebanon-Cumberland-Adams-York-Lancaster- 149 PM EDT Thu Jun 19 2025 ...SEVERE THUNDERSTORM WATCH 442 IN EFFECT UNTIL 9 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...Friday through Wednesday. A significant and extremely dangerous heat wave is expected Sunday through Wednesday. The risk of heat-related illnesses will be elevated given limited acclimation. Heat impacts are likely in some health systems, heat sensitive industries, and infrastructure. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. PAZ004>006-010>012-017>019-024>028-033>035-037-041-042-045-046-049- 050-201800- Warren-McKean-Potter-Elk-Cameron-Northern Clinton-Clearfield- Northern Centre-Southern Centre-Cambria-Blair-Huntingdon-Mifflin- Juniata-Somerset-Bedford-Fulton-Tioga-Northern Lycoming-Sullivan- Southern Clinton-Southern Lycoming-Union-Snyder- 149 PM EDT Thu Jun 19 2025 This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...This afternoon and tonight. Scattered severe thunderstorms with damaging winds 60 mph or greater are possible this afternoon and early evening. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. A significant and extremely dangerous heat wave is expected Sunday through Wednesday. The risk of heat-related illnesses will be elevated given limited acclimation. Heat impacts are likely in some health systems, heat sensitive industries, and infrastructure. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Special Weather Statement
National Weather Service State College PA
201 PM EDT Thu Jun 19 2025
PAZ036-064>066-192000-
York-Lancaster-Adams-Franklin-
201 PM EDT Thu Jun 19 2025
...THUNDERSTORMS WILL AFFECT SOUTH CENTRAL PA THROUGH 4 PM...
A cluster of thunderstorms along the Maryland border will move to
the east, affecting Franklin, Adams, York and Lancaster Counties
through 4 PM. Expect gusty winds and small hail. Heavy rain is also
possible.
Stay tuned for possible warnings.
&&
LAT...LON 3973 7798 3987 7786 4016 7652 3979 7605
3973 7610 3972 7622
DangeloThe Sterling radar (KLWX), 126 km away, was scanning. The volume nearest the first event began at 19:59 UTC.
20 thunderstorm wind. Local standard time, as filed.
A severe thunderstorm producing wind gusts estimated at 60 mph knocked a tree down approximately 1 mile east-southeast of Felton.
A line of severe thunderstorms producing wind gusts estimated at 60 mph knocked several trees and power lines down near Conestoga.
A severe thunderstorm producing wind gusts estimated at 60 mph knocked a tree down approximately 2 miles east of Brogue.
A line of severe thunderstorms producing wind gusts estimated at 60 mph uprooted multiple large trees in Delta.
A line of severe thunderstorms producing wind gusts estimated at 60 mph knocked trees and wires down along Lancaster Pike approximately 2 miles north-northwest of Wakefield.
A line of severe thunderstorms producing wind gusts estimated at 60 mph knocked down multiple trees and power lines approximately 4 miles north-northwest of Philipsburg.
A severe thunderstorm producing wind gusts estimated at 60 mph knocked down multiple trees near Steele Hollow Road and Maurer Lane.
A line of severe thunderstorms producing wind gusts estimated at 60 mph knocked power lines down near Port Matilda.
A line of severe thunderstorms producing wind gusts estimated at 60 mph knocked two trees down in Westmont.
A severe thunderstorm producing wind gusts estimated at 60 mph knocked several trees down near Waterville.
A severe thunderstorm, producing wind gusts estimated at 60 mph, knocked down multiple trees down south of Trout Run.
A severe thunderstorm producing wind gusts estimated at 60 mph knocked trees down along Route 87 near Montoursville.
A severe thunderstorm producing wind gusts estimated at 60 mph knocked trees down along Route 87 near Barbours.
A severe thunderstorm producing wind gusts estimated at 60 mph knocked multiple trees down near Hillsgrove.
A line of severe thunderstorms producing wind gusts estimated at 60 mph knocked several trees down onto cars in Lewisburg.
A line of severe thunderstorms producing wind gusts estimated at 60 mph knocked multiple trees down across East Buffalo Township.
A line of severe thunderstorms producing wind gusts estimated at 60 mph knocked multiple trees down across West Chilisquaque Township.
A severe thunderstorm, producing wind gusts estimated near 70 mph, knocked down and uprooted multiple trees in Milton. Shingles were also blown off on some residences in Milton.
A severe thunderstorm producing wind gusts estimated at 60 mph knocked multiple trees down near Colley.
A line of severe thunderstorms producing wind gusts estimated at 60 mph knocked multiple trees onto wires approximately 3 miles north-northeast of Bloomsburg. One of the trees caught fire.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2025Every state in 2025This day in weather historyWarnings in Pennsylvania, June 2025
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: 1263236, 1263234, 1263238, 1263237, 1263235, 1263239, 1263240, 1263243, 1263245, 1263247, 1255829, 1263249, 1263251, 1263252, 1263254, 1263256, 1263257, 1267745, 1263253, 1263258.