A slow moving warm front ignited a broken line of storms across portions of the county warning area. Storms remained pretty tame through 23Z before an increase of wind shear from the west, associated with a closed upper-level low, overspread western PA.
Every event with a place to put it. Tap one for its entry below.
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.
A slow moving warm front ignited a broken line of storms across portions of the county warning area. Storms remained pretty tame through 23Z before an increase of wind shear from the west, associated with a closed upper-level low, overspread western PA. Damaging wind gusts were mainly focused east of Pittsburgh.
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 Jun 25, 5:38 PM EST, 41 minutes earlier.
Area Forecast Discussion National Weather Service Pittsburgh PA 638 PM EDT Sun Jun 25 2023 .SYNOPSIS... A convective line will cross the region tonight. Severe thunderstorms will be possible mainly in eastern Ohio before storms weaken overnight. Then, upper level low pressure will provide humid, unsettled conditions with daily rounds of showers thunderstorms through the first half of the week, along with a trend towards below-normal temperature. && .NEAR TERM /THROUGH MONDAY/... A weak, broken convective line of showers and thunderstorms has formed across the area this evening, located roughly from Mercer across the Pittsburgh metro. These will likely continue to develop as they shift to the northeast this evening, but probability for severe threats is low given current parameters. Only update for this evening was to touch up PoPs to better capture this convection. Previous Discussion... Attention then turns to the expected convective event during the late evening and overnight period. The next upper low will be diving towards far southern Michigan, with a mid-level jet streak impinging on the lower Ohio Valley. During the afternoon, new convection will likely fire in western Indiana/Kentucky along the western edge of the best MLCAPE values, and then move east. Storms will likely be at their most intense near the intersection of the OH/IL/KY borders, where deep instability and strong shear are maximized - this is where the most intense severe weather is possible during the late afternoon/early evening. Further north, towards central Ohio, the trend will be more towards upscale growth into a squall line/QLCS as deep shear becomes a bit more line- parallel. This is the form that should arrive in the ZZV vicinity during the late evening, likely by 01Z or 02Z. As the complex arrives, surface-based CAPE of 1000 to 1500 J/kg will likely still exist in eastern Ohio. This should allow the line to maintain itself somewhat for an hour or two, with its attendant wind gust threat being the most pressing concern given DCAPE of over 1000 still lingering. Hail is a secondary but still potential threat initially, as NAM/HRRR soundings depict a short period of decent CAPE in the -10C to -30C hail growth zone. Any tornado threat would likely be limited to a brief spinup in a mesovortex along the line. Severe chances decrease towards the northern WV panhandle and far western PA as instability continues to wane, with convection favoring far southern Ohio/eastern Kentucky with time, where a plume of stronger CAPE will continue to reside. Still, the decaying line should provide showers and thunderstorms to the rest of the CWA as it moves through overnight. The line should depart by 07Z or so, with lingering isolated showers through sunrise. For Monday, the approaching upper low will provide another round of showers and thunderstorms beginning by midday with surface heating. Coverage will then build east through the afternoon. The main severe chance will lie to our east in the better instability and shear, and also in better lift as a trough axis crosses the ridges. Still, a strong storm or two will be possible in the southeast ridges during the afternoon before that threat ends. Depending on how rainfall occurs overnight, there may be a few areas that could be saturated enough to be subject to a isolated high water threat as weaker wind in the column leads to slower storm motions. && .SHORT TERM /MONDAY NIGHT THROUGH WEDNESDAY NIGHT/... A cold/occluded front will cross through the region Monday night, which will usher in a period of below-normal temperature through midweek. However, the dominant feature during this period will be the upper low, which will drift from the Michigan mitt across the eastern Great Lakes and Upper Ohio Valley through Tuesday night, and then into New York State by Wednesday. With the continued presence of above-normal precipitable water values and occasional spokes of vorticity rotating around the upper low, precipitation will be possible at any time during this period. However, diurnal forcing will likely drive the periods of best potential during the afternoon and early evening. Instability levels do not appear to be supportive of much of a severe threat, although isolated heavy rain totals and a high water issue or two can't be ruled out. The trough axis may swing to the east of the region by Tuesday night. Thus, by Wednesday, better PoPs will be located across the eastern CWA where vorticity advection and low-level cyclonic flow may persist a little longer. && .LONG TERM /THURSDAY THROUGH SUNDAY/... The ensembles continue to suggest that the upper low and trough will exit the region by Thursday afternoon/night, with a transition to flat ridging or quasi-zonal flow. This will allow temperatures to recover to more seasonable levels by the end of the work week, with precipitation chances generally limited to isolated diurnal activity at most. By next weekend, the return of southwest flow will mean increasing dewpoints and precipitable water. Temperatures will remain near or just above normal, while precipitation chances will be on the increase. Lift will be supplied by the possible approach/passage of a warm front Saturday, followed by a mid-level shortwave trough and a cold front on Sunday. && .AVIATION /22Z SUNDAY THROUGH FRIDAY/... VFR conditions have prevail for a majority of the day under low to mid-lvl ridging. Convection is currently ongoing in western Ohio and severe wind gusts have been noted in isolated areas within a broken line segment near Toledo, OH as an upper-lvl low ventures into the Great Lakes. Convection will likely continue into eastern Ohio in the next 6 hours. However, the confidence in severe storms is starting to diminish with the noted ridging in the temperature/moisture profiles below 12,000ft. Convection or the remnants of convection should advance through the region after 02/03Z in ZZV/HLG; after 04Z for the remain terminals. Heavy downpours may prompt MVFR to IFR vis and will be covered with TEMPOs. Hi-Res models indicated that VFR conditions will likely prevail through morning. However, it wouldn't be surprising if a few areas experience MVFR with heavy downpours for a brief period. Showers and thunderstorms will likely develop again Monday as the low pressure system enters central Michigan/north of Lake Erie. Isolated heavy downpours could impact terminals vis and drop to MVFR for a brief period. However, VFR cig conditions are expected to be prolong. .OUTLOOK... Scattered to isolated shower and thunderstorms chances are likely Tues/Wed with the lingering low pressure system to the north. MVFR to IFR conditions will likely return early Tues morning through Tues afternoon. && .PBZ WATCHES/WARNINGS/ADVISORIES... PA...None. OH...None. WV...None. && SYNOPSIS...CL NEAR TERM...Rackley/CL SHORT TERM...CL LONG TERM...CL AVIATION...Hefferan
Hazardous Weather Outlook National Weather Service Pittsburgh PA 500 AM EDT Sun Jun 25 2023 PAZ009-016-074-076>078-WVZ510-511-260900- Forest-Jefferson PA-Higher Elevations of Westmoreland- Higher Elevations of Fayette-Indiana-Higher Elevations of Indiana- Ridges of Eastern Monongalia and Northwestern Preston-Preston- 500 AM EDT Sun Jun 25 2023 This Hazardous Weather Outlook is for western Pennsylvania and northern West Virginia. .DAY ONE...Today and tonight. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Monday through Saturday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. OHZ039>041-048>050-057>059-068-069-PAZ007-008-013>015-020>022-029- 031-073-075-WVZ001>004-012-021-509-260900- Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson OH- Muskingum-Guernsey-Belmont-Noble-Monroe-Mercer-Venango-Lawrence- Butler-Clarion-Beaver-Allegheny-Armstrong-Washington-Greene- Westmoreland-Fayette-Hancock-Brooke-Ohio-Marshall-Wetzel-Marion- Monongalia- 500 AM EDT Sun Jun 25 2023 This Hazardous Weather Outlook is for east central Ohio, western Pennsylvania, and northern West Virginia. .DAY ONE...Today and tonight. A line of strong to severe thunderstorms will move through the region this evening into early tonight. Damaging wind will be the primary threat, though isolated instances of large hail or an isolated tornado can't be ruled out. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Hazardous weather is not expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation will likely be needed. WVZ512>514-260900- Eastern Preston-Western Tucker-Eastern Tucker- 500 AM EDT Sun Jun 25 2023 This Hazardous Weather Outlook is for northern West Virginia. .DAY ONE...Today and tonight. Hazardous weather is not expected at this time. .DAYS TWO THROUGH SEVEN...Monday through Saturday. Isolated strong to severe storms are possible Monday afternoon. Damaging wind seems to be the primary threat, but an isolated instance of hail is possible as well. .SPOTTER INFORMATION STATEMENT... Spotter activation may be needed.
The Pittsburgh radar (KPBZ), 47 km away, was scanning. The volume nearest the first event began at 23:19 UTC.
6 thunderstorm wind. Local standard time, as filed.
About 30 to 40 trees down along River Forest Road and River Forest Country Club. Power lines also done. Likely microburst.
Trees down along intersection Binkey Road and Four Miles Run Road.
Trees down on Marmont Lane.
Tree down on Route 954.
Trees down on Route 553 in Cherryhill Township.
Trees down along Route 580.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2023Every state in 2023This day in weather historyWarnings in Pennsylvania, June 2023
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: 1109786, 1109787, 1109788, 1109789, 1109790, 1109791.