Scattered showers and thunderstorms developed across the Pittsburgh region with the passage of a shortwave trough. Sufficient moisture and instability led to brief, isolated downpours.
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The episode as NWS PBZ wrote it up.
Scattered showers and thunderstorms developed across the Pittsburgh region with the passage of a shortwave trough. Sufficient moisture and instability led to brief, isolated downpours. Some thunderstorm segments had a storm motion which resulted in places receiving a quick inch or more in less than an hour. This resulted in isolated flash flooding in the Pittsburgh metro area.
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 Jul 28, 7:45 AM EST, 3 hours 50 minutes earlier.
Area Forecast Discussion National Weather Service Pittsburgh PA 845 AM EDT Thu Jul 28 2022 .SYNOPSIS... Periodic shower and thunderstorm chances will continue through Friday with a couple of crossing disturbances. Dry weather returns Saturday under high pressure. && .NEAR TERM /THROUGH TONIGHT/... A shortwave trough is expected to cross the region today. Scattered showers and thunderstorms are expected with its approach and passage. The highest chances for rain are expected E-S of PIT where passage of the trough is progged during a more favorable aftn timing, with slightly better instability. Sfc CAPE near 1000 j/kg, 30-40kt 0-6km shear, and dry mid lvl air could result in an isolated damaging wind potential E-S of PIT, where SPC has outlined this area in a Marginal Risk/isolated coverage for severe storms. The main limiting factor in severe storm development should be the cloud cover limiting diurnal destabilization, and less than optimal lapse rates. The trough should exit Wrn PA by mid to late aftn, with diminishing POPs from W-E. Sufficient storm motion and low chcs for training cells should limit/preclude a flood potential. && .SHORT TERM /FRIDAY THROUGH SATURDAY NIGHT/... A stronger shortwave trough, and its associated sfc cold front, is expected to approach and cross the Upper Ohio Valley region later tonight and Friday. Scattered-numerous showers are expected with shortwave supported ascent and moist advection. Instability is expected to remain limited, keeping thunderstorm chances relatively low. The cold front should complete its passage by Friday evening, with sfc high pressure then expected to build across the Great Lakes/Upper Ohio Valley region under NW flow aloft. This should result in a return to dry, less humid weather through the remainder of the period. Temperatures should average near seasonable levels after the passage of the Friday cold front. && .LONG TERM /SUNDAY THROUGH WEDNESDAY/... The sfc high should begin to move east of the area later Sunday. A gradual moisture return as the flow veers to the south could result in a few showers late across the higher terrain of WV. An upper trough is then expected to track ewd from the Midwest Sunday night through early in the week. Scattered showers and thunderstorms should increase with continued shortwave supported ascent and moisture return ahead of the trough. The trough should move east of the region by Tuesday night, as dry weather and increasing heat return by midweek as an upper ridge builds across much of the Central and Eastern CONUS. && .AVIATION /13Z THURSDAY THROUGH MONDAY/... MVFR/IFR cigs and scattered shra will continue to impact all terminals through the morning/early aftn hours as a shortwave trough treks across the region. CAM guidance and BUFKIT indicated elevated instability supports a chance for tsra development, mainly between 15Z-20Z, though extensive cloud cover and warm mid levels hinders confidence in actual materialization. Thus, a TEMPO group has been added to reflect potential timing, but confidence in tsra development remains low. A return to VFR is then expected this eve within shortwave ridging, though additional shra may develop overnight with the approach of a cold front. Confidence in coverage and placement is rather low attm, thus has been excluded from the recent TAF issuance. .Outlook... Restrictions are possible early Fri with that crossing cold front, but general improvement to VFR is expected thereafter and through the weekend under building high pressure. && .PBZ WATCHES/WARNINGS/ADVISORIES... PA...None. OH...None. WV...None. &&
Hazardous Weather Outlook National Weather Service Pittsburgh PA 856 AM EDT Thu Jul 28 2022 PAZ016-022-023-031-073>076-WVZ012-021-509>514-291300- Jefferson PA-Armstrong-Indiana-Greene-Westmoreland- Higher Elevations of Westmoreland-Fayette- Higher Elevations of Fayette-Wetzel-Marion-Monongalia- Ridges of Eastern Monongalia and Northwestern Preston-Preston- Eastern Preston-Western Tucker-Eastern Tucker- 856 AM EDT Thu Jul 28 2022 This Hazardous Weather Outlook is for western Pennsylvania and northern West Virginia. .DAY ONE...Today and tonight. Isolated severe thunderstorms with damaging wind gusts are possible this afternoon. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. Hazardous weather is not expected at this time. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures. OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>015-020-021-029- WVZ001>004-291300- Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson OH- Muskingum-Guernsey-Belmont-Noble-Monroe-Mercer-Venango-Forest- Lawrence-Butler-Clarion-Beaver-Allegheny-Washington-Hancock-Brooke- Ohio-Marshall- 856 AM EDT Thu Jul 28 2022 This Hazardous Weather Outlook is for east central Ohio, western Pennsylvania, and northern West Virginia. .DAY ONE...Today and tonight. The probability for widespread hazardous weather is low. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
The Pittsburgh radar (KPBZ), 19 km away, was scanning. The volume nearest the first event began at 16:35 UTC.
1 flash flood. Local standard time, as filed.
A thunderstorm produced heavy rainfall of around an inch in around a half an hour across a portion of Carnegie. The Pittsburgh fire chief reported flash flooding along Washington Ave between Hope Hollow and Boden Ave.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2022Every state in 2022This day in weather historyWarnings in Pennsylvania, July 2022
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: 1049318.