Showers and thunderstorms developed ahead of a prefrontal trough and again along lake and residual outflow boundaries. 00 inches, some storms did produce efficient rainfall for flash flooding.
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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 PBZ wrote it up.
Showers and thunderstorms developed ahead of a prefrontal trough and again along lake and residual outflow boundaries. With PWAT values near 2.00 inches, some storms did produce efficient rainfall for flash flooding.
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 Pittsburgh, PA wrote its last area forecast discussion before the first event at Aug 13, 7:36 PM EST, 24 minutes earlier.
Area Forecast Discussion National Weather Service Pittsburgh PA 836 PM EDT Wed Aug 13 2025 .SYNOPSIS... Showers and thunderstorms are expected today and tonight as a cold front crosses the region. The front will slowly exit on Thursday. Mainly dry weather is then expected Thursday night through Saturday as high pressure builds in. && .NEAR TERM /THROUGH THURSDAY/... KEY MESSAGES: - Showers and thunderstorms this evening - Locally heavy downpours possible --------------------------------------------------------------- PWAT remains high, and buoyancy on the weaker side, suggesting potential for localized heavy rain with any vigorous updrafts, but storm movement also is non-trivial, which means heavy rain ought not to linger from any one storm. However, storm interactions within the increasing coverage area still will support localized flash flooding despite the storm movement. With little predictability in where such interactions might occur, and the overall limited potential, no flash flood watch appears necessary at this time. The threat has been highlighted in the HWO and will otherwise be handled with mesoscale messaging. && .SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY NIGHT/... KEY MESSAGES: - A few lingering showers/storm Thursday south of I-80 - Generally dry Thursday night through Friday night ---------------------------------------------------------------- The overnight trough axis will influence the region residually Thu morning, potentially maintaining showers after sunrise. But a high-confidence upper-level pattern is evident as shortwave ridging builds into the NE'rn CONUS and the sern ridge develops NW'ward into the MS valley. The net result during Thu-Fri will be increasing influence of high pressure and limited risk of storms. If any storms do develop, they are most likely to occur within terrain-induced convergence axes in the ridge zones of WV/PA during the typical convective diurnal cycle. With a transitioning pattern and generally clear overnight sky, heat is not expected to be excessive, with maxima/minima near normal in the upper 80s/low-mid 60s. && .LONG TERM /SATURDAY THROUGH WEDNESDAY/... KEY MESSAGES: - Dry and hot for areas outside of the ridges Saturday - Shower and thunderstorm chances return Sunday - Mainly dry and hot Monday - Showers and thunderstorm possible Tuesday and Wednesday ------------------------------------------------------------------- A relatively high-predictability pattern is anticipated for the weekend, as an upper-level ridge builds nwd into the Midwest while a strong low pressure center remains situated over far nrn Canada. Between the two extrema, a shortwave trough is expected to advance across Ontario, with variance in its intensity/poleward positioning driving uncertainty. On Sat, this axis is wholly predicted to avoid influencing the Upper Ohio Valley, with any storm potential tied to terrain- induced convergence lines in the ridge areas. On Sun, if the trough axis position develops farther south as some ensemble members suggest, there may be sufficient ascent on Sun to support broader storm coverage, especially in the I-80 corridor, where enhanced convergence could exist along a frontal zone. Either way, above-average heat (near or above 90F) will return for the weekend with high confidence. Given potential for higher PWAT but also greater uncertainty in the degree of dry air aloft during the weekend, it is unclear at this time whether a notable risk for flash flooding or severe storms exists. These concerns will be monitored as confidence in the atmospheric ingredients increases closer to the weekend. The broad pattern remains higher-confidence thru early next week, with a ridge in the wrn CONUS and a trough over ern Canada. The devil is in the details, though, as there also remains considerable variance in cluster analysis of the pattern amplitude and strength. The net result of this variance suggests that the associated sfc high pressure to the north of the Ohio Valley has considerable east/west positioning difference among the ensemble membership, and therefore makes wind direction/speed prediction difficult, especially Mon/Tue. Any shower/storm chances during this time again likely would be tied to terrain-induced convergence lines along the ridges. By Wed, the possible approach of another frontal zone into a warm/moist airmass could support storms. && .AVIATION /01Z THURSDAY THROUGH MONDAY/... Current storms are developed off an outflow boundary along the cold front. They will remain scattered in nature with each each storm capable of bringing localized reductions in CIGs/VIS as well as gusty winds. The scattered nature of these storms has been captured in PROB30s this evening. Confidence in occurrence remains far higher than location at this time and thus PROB30s have been held and TEMPOs have not been used. Once the boundary has passed through and the convection has eased, ceilings should become widespread VFR with higher confidence for a short period of time. MVFR or IFR ceilings look likely overnight with fog possible at a number of ports. At this time TEMPOs for fog have been included in FKL/DUJ/MGW. If needed we can expand these in future updates. Degraded CIGs are expected to begin to scatter by late tomorrow morning. Tomorrow, VFR ceilings expected during the afternoon with winds out of the north. Conditions are expected to remain dry for most of the region. Northern West Virginia may see an isolated shower/thunderstorm. By tomorrow evening, dry conditions are expected region-wide. Outlook... Dry weather expected to prevail into the weekend with high confidence in prevailing VFR with high pressure developing near New England. && .PBZ WATCHES/WARNINGS/ADVISORIES... PA...None. OH...None. WV...None. && SYNOPSIS...Kramar/WM NEAR TERM...Kramar SHORT TERM...Kramar LONG TERM...Kramar AVIATION...Lupo/AK
Hazardous Weather Outlook...UPDATED National Weather Service Pittsburgh PA 1228 PM EDT Wed Aug 13 2025 OHZ039>041-048>050-057>059-068-PAZ007>009-013>016-020>022-029-073- 077-WVZ001>003-141630- Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson OH- Muskingum-Guernsey-Belmont-Noble-Mercer-Venango-Forest-Lawrence- Butler-Clarion-Jefferson PA-Beaver-Allegheny-Armstrong-Washington- Westmoreland-Indiana-Hancock-Brooke-Ohio- 1228 PM EDT Wed Aug 13 2025 This Hazardous Weather Outlook is for east central Ohio, western Pennsylvania, and northern West Virginia. .DAY ONE...This afternoon and tonight. There is a low potential for localized heavy rainfall late this afternoon and evening as storms develop ahead of a cold front. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected. OHZ069-PAZ031-074>076-078-WVZ004-012-021-509>514-141630- Monroe-Greene-Higher Elevations of Westmoreland-Fayette- Higher Elevations of Fayette-Higher Elevations of Indiana-Marshall- Wetzel-Marion-Monongalia- Ridges of Eastern Monongalia and Northwestern Preston-Preston- Eastern Preston-Western Tucker-Eastern Tucker- 1228 PM EDT Wed Aug 13 2025 This Hazardous Weather Outlook is for east central Ohio, southwest Pennsylvania, western Pennsylvania, and northern West Virginia. .DAY ONE...This afternoon and tonight. There is an elevated chance for localized heavy rainfall and potential flash flooding thru this evening as additional storms develop ahead of a cold front. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. Kramar
The Pittsburgh radar (KPBZ), 18 km away, was scanning. The volume nearest the first event began at 00:59 UTC.
1 flash flood. Local standard time, as filed.
State official reported flooding on PA 989.
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, August 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: 1289473.