Low pressure stationed over the Great Lakes to southwestern New York State allowed for an occluded front to drape across northwestern Pennsylvania during the early afternoon hours of August 20, 2025. Multiple reports of a funnel cloud were observed near Youngsville in Warren County.
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The episode as NWS CTP wrote it up.
Low pressure stationed over the Great Lakes to southwestern New York State allowed for an occluded front to drape across northwestern Pennsylvania during the early afternoon hours of August 20, 2025. Multiple reports of a funnel cloud were observed near Youngsville in Warren County.
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 Aug 20, 6:13 AM EST, 7 hours 52 minutes earlier.
Area Forecast Discussion National Weather Service State College PA 713 AM EDT Wed Aug 20 2025 .SYNOPSIS... * A warm/cold front tandem arrives from eastern Ohio today and brings numerous showers and isolated to scattered thunderstorms. * High pressure over eastern Canada will help keep Erin offshore and PA dry as the hurricane passes our latitude. * A refreshing taste of Fall likely to arrive into the last week of August && .NEAR TERM /UNTIL 6 PM THIS EVENING/... Widespread stratus and stratocu within a llvl cold air damming regime led to overnight min temps generally in the low to mid 60s across the CWA. Increasing low to mid level theta-E advection aimed at our Central and NW Mtns was supporting an area of showers and a few TSRa across Western PA INVOF of a sfc quasi-stnry front banked up along the Western Ridges of the Laurels and NW Mtns. The narrow warm sector to the west of this front will shrink further as a cold front catches up from the west and occludes as it enters/slowly moves across the central part of our CWA late this morning and this afternoon, before stalling and transitioning into more of a stationary front/inverted trough thanks to increasing influence and deepening easterly flow to the north/northwest of Hurricane Erin that will be centered about 250 NM SE of Cape Hatteras NC early Thursday morning. The increasingly focused low to mid level theta-E convergence (near and just to the NW of the highest PWAT values of 1.75 to 2.0 inches across the Mid and Lower Susq Valley) could lead to some highly localized 1-2 inch rainfall totals over a 6-12 hour period, which should be handled fairly well as a result of much higher FFG values over that time interval. Nonetheless, a low probability for amounts heavier than this prompted WPC to blanket much of the CWA with a a MRGL Risk for excessive rain this afternoon into tonight. We will highlight this in our Hazardous Weather Outlook (HWO) and Social Media platforms at this point. High temps today will only reach the mid and upper 60s across the Mtns North and East of KIPT with upper 70s to low 80s across the Southern Tier counties of the state. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM THURSDAY/... Lingering forcing and boundaries for the overnight keeps SHRA/isold TSRA in the forecast until dry air moves in from the NE. Lows overnight tonight will be nearly identical to temps we're seeing early this Wed morning - which is mid to upper 50s across the Northern Tier and low to mid 60s elsewhere. && .LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/... Confidence is high for the long range. Large scale subsidence to the west of departing Hurricane Erin provides a mainly dry Thurs and all dry Fri. Erin passes well to the east of PA with max wind only 12KT with gusts under 20KT in Lancaster Co Thurs. Rising heights into the weekend will promote a warming trend with highs rebounding back into the lower 80s for Friday and through the whole weekend. Longer range model and ensemble data continues to show a more formidable upper trough digging into the Great Lakes and amplifying this weekend over the Eastern U.S. Moisture returning northward from the Gulf along the leading frontal boundary should provide a focus for showers and storms with max POPs Sat-Sun as it moves slowly eastward from the Appalachians toward the Mid Atlantic coast. Taste of Fall on the horizon for at least the first part of next week as cooler/more refreshing air filters into the region from Canada. && .AVIATION /11Z WEDNESDAY THROUGH SUNDAY/... Current radar depicts showers across generally confined to the northeastern edge of the airspace, likely only impacting IPT over the next hour before drifting further east. Guidance continues to indicate that the current low-level cloud deck will remain fairly persistent throughout much of the day. Recent GLAMP guidance does indicate slight improvements in the afternoon/evening hours across south-central (AOO) and southeastern (MDT/LNS) terminals with MVFR being the most plausible solution given recent RAP model soundings and GLAMP model guidance. Low clouds are expected to prevail once again after 00Z Thursday with high confidence, especially after 06Z Thursday, where widespread IFR-to-LIFR conditions are progged by the bulk of model guidance. The less certain portion of the TAFs come with respect to precipitation chances this afternoon/evening. Current radar trends do outline some windows of opportunity for (relatively) dry conditions, thus have combined these trends with current model guidance in order to gauge those windows with low-to- moderate (~30-50%) confidence. Further SHRA development is expected to continue over the next couple of hours; however, given recent radar trends looking like SHRA will shoot the gaps between JST/AOO and UNV, have limited mentions in the near-term (through 18Z Wednesday). Coverage of SHRA/TSRA becomes more uncertain after 18Z-06Z, with GLAMP guidance indicating little in the way of precipitation; however, HREF/NBM remain fairly consistent with respect to SHRA coverage, thus have included PROB30s timing out shower activity this afternoon/evening. At this time, isolated TSRA seem the most plausible, with confidence too low for inclusion in the 12Z TAF package. Outlook... Fri-Sat...VFR. AM fog possible. Sun...T-storms likely. && .CTP WATCHES/WARNINGS/ADVISORIES... None. && SYNOPSIS...Lambert NEAR TERM...Lambert/Bauco SHORT TERM...Lambert/Dangelo LONG TERM...Dangelo/Steinbugl AVIATION...NPB
Hazardous Weather Outlook National Weather Service State College PA 355 AM EDT Wed Aug 20 2025 PAZ004-005-010-210800- Warren-McKean-Elk- 355 AM EDT Wed Aug 20 2025 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...Thursday through Tuesday. 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>028-033>037-041-042-045-046-049>053- 056>059-063>066-210800- Potter-Cameron-Northern Clinton-Clearfield-Northern Centre- Southern Centre-Cambria-Blair-Huntingdon-Mifflin-Juniata-Somerset- Bedford-Fulton-Franklin-Tioga-Northern Lycoming-Sullivan- Southern Clinton-Southern Lycoming-Union-Snyder-Montour- Northumberland-Columbia-Perry-Dauphin-Schuylkill-Lebanon-Cumberland- Adams-York-Lancaster- 355 AM EDT Wed Aug 20 2025 This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...Today and tonight. Scattered, slow-moving and potentially training thunderstorms could produce locally heavy rainfall over one inch in less than an hour. A few instances of flooding in poor drainage areas, and along small streams and adjacent roads is possible later this afternoon and evening. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotters are encouraged to report significant hazardous weather, including heavy rainfall over one inch and any flooding. Lambert
The Buffalo radar (KBUF), 130 km away, was scanning. The volume nearest the first event began at 19:07 UTC.
1 funnel cloud. Local standard time, as filed.
A funnel cloud formed near the intersection of US Route 6 and US Route 62 east of Youngsville. The funnel cloud was confirmed via numerous videos from Facebook along with a report from the Director of Warren County EMA.
After NWS Directive 10-1605, the rules offices file Storm Data by.
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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: 1276268.