Low pressure stationed across the Delmarva during the early morning hours of May 6, 2025 began to lift north and east during the afternoon hours, allowing portions of eastern Pennsylvania to have a brief period of residence time in the warm sector. This residence time allowed for destabilization ahead of a surface cold front, with ample shear in place to allow for a line of showers and…
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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.
Low pressure stationed across the Delmarva during the early morning hours of May 6, 2025 began to lift north and east during the afternoon hours, allowing portions of eastern Pennsylvania to have a brief period of residence time in the warm sector. This residence time allowed for destabilization ahead of a surface cold front, with ample shear in place to allow for a line of showers and thunderstorms to slowly lift north and east through the region during the afternoon and evening hours. Severe thunderstorms associated with the line caused numerous tree damage in the Lower Susquehanna Valley, with a microburst producing a concentrated area of damage west of Orwigsburg consisting of snapped and uprooted trees. Heavy rain continued further north, where already saturated soils allowed for isolated instances of flooding closing roadways in Lycoming and Tioga counties. Heavy rainfall in Dauphin County also caused flash flooding, closing multiple roadways in Harrisburg during rush hour.
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 May 6, 5:08 AM EST, 6 hours 55 minutes earlier.
Area Forecast Discussion National Weather Service State College PA 608 AM EDT Tue May 6 2025 .SYNOPSIS... * Multi-day stretch of wet weather continues into late week * A few strong to marginally severe storms are possible this afternoon across east-central PA with localized downpours * Eventual breakdown of the stagnant/repeat wet pattern signals improving conditions for Mother's Day Weekend && .NEAR TERM /THROUGH TONIGHT/... Training rain bands continue to track north-south across the Susquehanna Valley near the occluded frontal zone early this morning. MRMS data indicates hourly rain rates have leveled off quite a bit from last night at <0.50 inch/hr. Noticeably cooler and drier air has arrived in clear slot behind the front with areas of locally dense fog across the Laurel Highlands and south central ridges. The closed upper low responsible for the recent multi-day stretch of wet weather throughout most of CPA will begin to unravel and lift to the northeast into New England by 12Z Wed. Despite its pending departure, it will help to trigger another round of rain/showers and a few thunderstorms ramping up through peak heating. Hires guidance focuses isolated to scattered convection along the occluded front over east central PA this afternoon and early evening. Low-level convergence along the front and large-scale ascent associated with the 500mb low will combine with 500-1,000 J/kg of MUCAPE, robust deep layer shear, and steep lapse rates to support a marginal wind damage/hail threat. Although PWs are on the decline, locally heavy north-south training downpours on low FFGs will also support the potential for isolated instances of flooding especially in areas where soils have been substantially saturated. Trailing shortwave energy on the backside of the departing upper low should maintain showers into tonight particularly over the southern tier of CPA before POPs gradually decrease into early Wednesday morning. Highs will be +/- 5 degrees either side of early May climo with cooler conditions (60-65F maxT) in the western Alleghenies and milder temps (65-75F) throughout the Susquehanna Valley or ahead of the occluded front. && .SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/... A brief respite or lull in the frequent rain showers is expected into midweek as the upper low continues to pull away from the region. We still can't rule out a few showers especially across the northern mtns Wednesday PM - but on the margin it should be drier vs. recent days. Highs trend a bit warmer on balance with daytime maxes in the 65-75F range. The lull in the precip will be short-lived with yet another upper trough fcst to close off over PA by Thursday night. Rain showers and a few t-storms are likely Thursday afternoon into Thursday night with ensemble data placing max POPs across the southern and eastern portions of the forecast area. Temp trends for Thursday should be flat to down day over day with the most noticeable change in the northern tier with highs falling back into the 50s followed by mins in the 35-40F range Thursday night. && .LONG TERM /FRIDAY THROUGH MONDAY/... Hopefully, Friday is the last day to deal with rain showers associated with closed upper low #2. The latest model data is signaling improving conditions for Mother's Day weekend. && .AVIATION /10Z TUESDAY THROUGH SATURDAY/... Back edge of the showers near IPT as of 6 AM. Areas to the west and south had cleared out, and with the westerly winds becoming light, this has resulted in a thin layer of fog in spots like UNV and here at the office. Overall expect conditions to slowly improve this morning. There will be a chance of a few more showers and perhaps a thunderstorm this afternoon, as the upper level low and the cold air aloft remain near the area. I would think the far eastern area has the higher chance of some showers and perhaps a storm, as these areas are closer to the warm avection. Plan to hold close to earlier TAF fcst. Outlook... Wed-Fri...Showers become more scattered with higher chances in the afternoon/evening hours. Restrictions possible. Sat...No sig wx. && .CTP WATCHES/WARNINGS/ADVISORIES... None. && SYNOPSIS...Steinbugl NEAR TERM...Steinbugl SHORT TERM...Steinbugl LONG TERM...Dangelo/Bowen AVIATION...Martin
Hazardous Weather Outlook National Weather Service State College PA 1100 AM EDT Tue May 6 2025 PAZ004>006-010-011-017-018-024>026-033>036-071500- Warren-McKean-Potter-Elk-Cameron-Clearfield-Northern Centre-Cambria- Blair-Huntingdon-Somerset-Bedford-Fulton-Franklin- 1100 AM EDT Tue May 6 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...Wednesday through Monday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. PAZ012-019-027-028-045-046-049>052-056-063-064-071500- Northern Clinton-Southern Centre-Mifflin-Juniata-Southern Clinton- Southern Lycoming-Union-Snyder-Montour-Northumberland-Perry- Cumberland-Adams- 1100 AM EDT Tue May 6 2025 This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...Today and tonight. Isolated strong to severe storms could produce marginally severe wind gusts and localized urban and poor drainage flooding this afternoon and evening. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotters are encouraged to report significant hazardous weather. PAZ037-041-042-071500- Tioga-Northern Lycoming-Sullivan- 1100 AM EDT Tue May 6 2025 ...FLOOD WATCH IN EFFECT FROM 2 PM EDT THIS AFTERNOON THROUGH WEDNESDAY MORNING... 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. Flood Watch. In addition to the risk of flooding, isolated strong to severe storms could produce marginally severe wind gusts this afternoon and evening. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. Please listen to NOAA Weather Radio or go to weather.gov/StateCollege on the internet for more information about the following hazards. Flood Watch. .SPOTTER INFORMATION STATEMENT... Spotters are encouraged to report significant hazardous weather. PAZ053-057>059-065-066-071500- Columbia-Dauphin-Schuylkill-Lebanon-York-Lancaster- 1100 AM EDT Tue May 6 2025 This Hazardous Weather Outlook is for central Pennsylvania. .DAY ONE...Today and tonight. Severe thunderstorms with damaging winds 60 mph or greater are possible this afternoon and evening. .DAYS TWO THROUGH SEVEN...Wednesday through Monday. The probability for widespread hazardous weather is low. .SPOTTER INFORMATION STATEMENT... Spotters are encouraged to report significant hazardous weather.
The State College radar (KCCX), 156 km away, was scanning. The volume nearest the first event began at 17:02 UTC.
5 thunderstorm wind, 2 flood, 1 flash flood. Local standard time, as filed.
A severe thunderstorm producing wind gusts estimated at 60 mph knocked a tree down onto wires in the 300 block of South Cherry Street in Myerstown.
A severe thunderstorm producing wind gusts estimated at 60 mph knocked a tree down which blocked State Route 183 approximately 2 miles south-southeast of Summit Station.
A severe thunderstorm produced a microburst approximately 2 miles west of Orwigsburg with peak winds estimated at 70 to 80 mph. Several pine trees were snapped or uprooted.
Approximately 2.50 of rain in an hour caused flash flooding along North Progress Avenue during the afternoon rush hour, leading to the closure of a lane of traffic due to water across the roadway.
A severe thunderstorm producing wind gusts estimated at 60 mph knocked a tree down onto a car on Route 501 near the intersection with Route 322 approximately 1 mile west of Brickerville.
A severe thunderstorm produced a measured wind gust of 64 mph in Myerstown. Several tree limbs were also knocked down.
Water was reported to be across the road at the intersection of Zuni Lane and Sechler Circle near Garden View.
Water was reported to be across portions of Locey Creek Road between Briar Hill and Butler Hill roads just south of Osceola.
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, May 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: 1252389, 1252395, 1252401, 1244326, 1252403, 1252404, 1246045, 1246049.