A short-wave trough moving into central Pennsylvania in a sufficiently unstable and sheared environment allowed for numerous showers to occur during the early afternoon hours of June 18, 2025 with thunderstorm coverage increasing during the mid-afternoon hours and into the evening. Lake breeze convection across northwestern Pennsylvania allowed for scattered thunderstorms to move into 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 short-wave trough moving into central Pennsylvania in a sufficiently unstable and sheared environment allowed for numerous showers to occur during the early afternoon hours of June 18, 2025 with thunderstorm coverage increasing during the mid-afternoon hours and into the evening. Lake breeze convection across northwestern Pennsylvania allowed for scattered thunderstorms to move into the sheared and unstable environment with a line of showers and isolated severe thunderstorms progressing across the northern half of central Pennsylvania. Early afternoon showers produced efficient rainfall, causing an instance of flash flooding in northern Clearfield County, with a roadway closed due to high water. Damage with the initial lake breeze convection was limited to Warren and Elk counties in the form of tree damage. Severe thunderstorms with the line of thunderstorms produced isolated instances of tree damage along the Interstate 80 corridor.
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 18, 10:47 AM EST, 1 hour 13 minutes earlier.
Area Forecast Discussion National Weather Service State College PA 1147 AM EDT Wed Jun 18 2025 .SYNOPSIS... * A somewhat warmer, more muggy day is on tap for today, with fairly numerous showers and a few thunderstorms. * Strong to potentially severe thunderstorms remain possible Thursday afternoon (risk level 2 out of 5). * The first significant heat wave of the season is expected from Sunday into early week, with Major Heat Risk forecast (level 3 out of 4). && .NEAR TERM /UNTIL 8 PM THIS EVENING/... Short wave trough moving across OH/wrn PA will continue to provide forcing for SHRA/TSRA this afternoon, with the most expected in the east. AM rainfall has not been excessive but a few areas are already getting wet. No ltg quite yet as the warm, moist lower atmos has been allowing little ice to form yet. Expect the increasing CAPE and lift this aftn to change that. FF threat is still MRGL, since the SHRA/TSRA will be moving a little quicker than yesterday. Expect some of them to train over the same areas, though. This is already starting to set up over nrn Clearfield and srn Elk Cos. The severe threat is maximized in the SE where the sun is starting to come thru the clouds. 30KTs of deep layer shear and CAPEs into the 1000-1500J range will make a few of the storms get tall and make gusty winds, and perhaps damaging wind gusts. A slightly drier airmass and sinking air should help shove the storms to the east of the area this evening. By 8 PM, they should be out. && .SHORT TERM /8 PM THIS EVENING THROUGH 6 PM THURSDAY/... 2 am/06z update... Continued large-scale flow progression is expected tonight- Thursday, with a temporary reduction in showers and storms for much of tonight, as PA emerges well into the surface warm sector, but also stays well ahead of any mid- level height falls tied to the approach of a northern stream short- wave and associated surface cold front. It's certainly plausible that a few showers and storms could reach the Alleghenies, but very likely not until shortly before daybreak. On Thursday, the main forecast issue is just how quickly the aforementioned upper trough and surface cold front push through central PA. Current model timing still suggests that most of the convection could occur in the morning or early afternoon hours for much of the Alleghenies, as well as the ridge and valley region. Later timing of these features for the Endless Mountains, the Poconos, and the Middle to Lower Susquehanna Valleys should afford a better opportunity for heating/destabilization, leading to better potential for strong- severe storms, within a pretty strongly sheared environment. At this point, we continue to advertise a risk level 2 out of 5, with damaging winds the primary threat. At this vantage point, Friday still looks seasonably warm and sunny behind the above mentioned cold front, but much less humid. && .LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/... Main change to the package was minor adjustments to the Saturday, as convection can drop southeast across the top of the upper level ridge into our area. Still looks hot as we head into the start of the week, but always a chance for convection to drop into area, given the type of airmass in place, and the wet ground from recent rains. Earlier discussion below. As upper ridging builds in, a strong capping inversion (with mid level temps peaking in the 12-13C range over the weekend) will greatly limit any shower/thunderstorm chances to sub 20 pct for Sat-Mon. By Sunday, highs in the low to mid 90s are becoming more likely as a very strong ridge of high pressure with 500mb heights approaching 600dm builds overhead. 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. 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 /16Z WEDNESDAY THROUGH SUNDAY/... Looking at some pop up showers and storms this afternoon, as the airmass heats up. Will continue to adjust fcst as needed. Earlier discussion below. A few strong t-storms are possible particularly in the vicinity of KMDT and KLNS and have included PROB30s with the 18/06Z TAF cycle. Overall convective coverage does not appear to be as widespread as yesterday with mainly dry wx probable for the central and eastern airspace overnight. Latest guidance supported adding LLWS to the western and central airfields as LLJ increasing from ~240 degrees into early Thursday morning. Outlook... Thu...Predominantly VFR, although strong PM t-storms are possible with a cold frontal passage. Fri...Predominantly VFR, with a slight chance of a rain shower north. Sat-Sun...Mainly VFR. Hot. && .CLIMATE... A daily record rainfall of 1.72" was set at Altoona yesterday 6/17. This broke the previous record of 1.22" set in 1978. Astronomical Summer (solstice) officially arrives on Friday, June 20, at 10:42 p.m. && .CTP WATCHES/WARNINGS/ADVISORIES... None. && SYNOPSIS...Jurewicz/Lambert NEAR TERM...Jurewicz/Dangelo SHORT TERM...Jurewicz/Banghoff LONG TERM...Steinbugl/Martin AVIATION...Steinbugl/Martin CLIMATE...Steinbugl
Hazardous Weather Outlook National Weather Service State College PA 1246 PM EDT Wed Jun 18 2025 PAZ004-005-010-017-024-033-191700- Warren-McKean-Elk-Clearfield-Cambria-Somerset- 1246 PM EDT Wed Jun 18 2025 This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...This afternoon and tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Strong to potentially severe thunderstorms with frequent lightning, gusty winds and heavy rainfall are possible during the early to mid morning hours Thursday. After a several hour lull in the convection late Thursday morning, a second round of strong thunderstorms with gusty winds are possible Thursday afternoon. The first heat wave of the season is expected Sunday into early next week. The risk of heat-related illnesses is likely 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. PAZ006-011-012-018-037-041-191700- Potter-Cameron-Northern Clinton-Northern Centre-Tioga- Northern Lycoming- 1246 PM EDT Wed Jun 18 2025 This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...This afternoon and tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. A few strong thunderstorms with gusty winds are possible Thursday afternoon. The first heat wave of the season is expected Sunday into early next week. The risk of heat-related illnesses is likely 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. PAZ064>066-191700- Adams-York-Lancaster- 1246 PM EDT Wed Jun 18 2025 ...SEVERE THUNDERSTORM WATCH 433 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...Thursday through Tuesday. A few strong to potentially severe thunderstorms with damaging winds are possible Thursday afternoon and evening. The first heat wave of the season is expected Sunday into early next week. The risk of heat-related illnesses is likely 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. PAZ019-025>028-034>036-042-045-046-049>053-056>059-063-191700- Southern Centre-Blair-Huntingdon-Mifflin-Juniata-Bedford-Fulton- Franklin-Sullivan-Southern Clinton-Southern Lycoming-Union-Snyder- Montour-Northumberland-Columbia-Perry-Dauphin-Schuylkill-Lebanon- Cumberland- 1246 PM EDT Wed Jun 18 2025 This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...This afternoon and tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. A few strong to potentially severe thunderstorms with damaging winds are possible Thursday afternoon and evening. The first heat wave of the season is expected Sunday into early next week. The risk of heat-related illnesses is likely 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.
Preliminary Local Storm Report
National Weather Service State College PA
1145 AM EDT Wed Jun 18 2025
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0511 PM Tstm Wnd Dmg 2 NNW Barnes Gap 39.79N 78.35W
06/17/2025 Bedford PA Utility Company
Numerous trees down on wires off of York
Road.
&&The State College radar (KCCX), 61 km away, was scanning. The volume nearest the first event began at 16:59 UTC.
16 thunderstorm wind, 1 flash flood. Local standard time, as filed.
Flash flooding led to water covering Flowing Well Road at Coal Run to the east of Dubois.
A severe thunderstorm, producing wind gusts estimated at 60 mph, knocked down a tree into wires on Tidioute Creek Road northwest of Tidioute.
A severe thunderstorm, producing wind gusts estimated at 60 mph, knocked down a tree into wires on Davey Hill Road northeast of Tidioute.
A severe thunderstorm, producing wind gusts estimated at 60 mph, knocked down a tree into wires on River Road in Starbrick, approximately one mile west of Warren.
A severe thunderstorm, producing winds estimated at 60 mph, knocked a tree down on wires northwest of Johnsonburg.
A severe thunderstorm, producing winds estimated near 60 mph, knocked a tree down on wires along Calabash Court southeast of Treasure Lake.
A severe thunderstorm, producing wind gusts estimated near 60 mph, knocked down a tree on wires on Walking Horse Lane northeast of Salem.
A severe thunderstorm, producing wind gusts estimated near 60 mph, knocked down a tree on Main Street in Mahaffey.
A severe thunderstorm, producing wind gusts estimated near 60 mph, knocked down a tree on Main Street in Newburg.
A severe thunderstorm, producing wind gusts estimated near 60 mph, knocked a tree down into wires in Plymptonville.
A severe thunderstorm, producing wind gusts estimated near 60 mph, knocked down a tree and wires on US Route 322 west of Philipsburg.
A severe thunderstorm, producing wind gusts estimated near 60 mph, knocked down multiple trees on Egypt Hollow Road west of Runville.
A severe thunderstorm, producing wind gusts estimated near 60 mph, knocked a tree down into wires across Big Plum Run Road east of Swissdale.
A severe thunderstorm, producing wind gusts estimated near 60 mph, knocked down a tree and wires onto German Road in Woolrich.
A severe thunderstorm, producing wind gusts estimated near 60 mph, knocked down a tree and wires on Dutch Hollow Road northeast of Woolrich.
A severe thunderstorm, producing wind gusts estimated near 60 mph, knocked down a tree onto wires on Anderson Road west of Hepburnville.
A severe thunderstorm, producing wind gusts estimated near 60 mph, knocked down a tree onto wires on Kramer Hill Road between Benton and Stillwater.
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: 1266681, 1262247, 1262244, 1262248, 1262414, 1262415, 1262416, 1262417, 1262418, 1262419, 1262420, 1262421, 1262422, 1262423, 1262424, 1262425, 1262426.