A series of convective systems moving through the Ohio Valley on the 22nd, produced sporatic wind damage across the region with modest instability and high shear in place. The first MCS went through in the morning hours, limiting it's intensity somewhat and helped stabilize northwestern Pennsylvania, but the second system approached late enough, across northern West Virginia, to remain strong…
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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.
A series of convective systems moving through the Ohio Valley on the 22nd, produced sporatic wind damage across the region with modest instability and high shear in place. The first MCS went through in the morning hours, limiting it's intensity somewhat and helped stabilize northwestern Pennsylvania, but the second system approached late enough, across northern West Virginia, to remain strong enough to produce some wind damage.
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 22, 4:15 AM EST, 2 hours 28 minutes earlier.
Area Forecast Discussion National Weather Service Pittsburgh PA 515 AM EDT Sat Jul 22 2017 .SYNOPSIS... Warm and humid through the weekend. Showers and storms are also expected today and Sunday. Storms could be severe and produce heavy downpours. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... Large MCS over the Western Great Lakes/Upper Midwest will be moving into my western counties around daybreak. H7-H5 lapse rates approach 6.5ckm-1 while MUcapes push 2.0kjkg-1. Wind shear is impressive as well with nearly 40 knots of shear. All of this will create an atmosphere that could yield strong to severe storms, really at any time today. Atmosphere keeps its tropical characteristics with PWATS around two inches and warm cloud depths nearing 13KFT. This will lead to heavy downpours with any storm which will increase the flash flooding threat. Limitations to the severe threat will be dependent on the amount of cloud cover today, which in turn will keep temperatures down and prevent the area from reaching forecasted convective temperatures. Additionally, still have plenty of warm air aloft and morning showers/storms will work to cool the lower levels and increase atmospheric stabilization. All of this will need to be monitored throughout the day. && .SHORT TERM /6 PM THIS EVENING THROUGH MONDAY/... The risk for showers and storms will continue overnight, with the focus shifting southward as the surface boundary is pushed toward West Virginia. Another shortwave, moving southeastward in the northwest flow aloft, will work to move the boundary into the Mid-Atlantic region by dawn on Sunday. Sunday confidence is lower in organized convection moving through the region however we still remain in northwest flow with disturbances riding through. Activity wanes Sunday night with the loss of daytime heating, but again expect a muggy night with temps well into the 60s and lower 70s. Mid level trough sweeps through Monday afternoon so this will be the last round of showers/storms before a welcome break occurs. && .LONG TERM /MONDAY NIGHT THROUGH FRIDAY/... Highlights: - Lower humidity - Active weather regime end of next week returns H5 heights build Tuesday into Wednesday offering a reprieve from daily chance of storms. After Tuesday being the coolest day of the week, temperatures ramp back up towards normal values in the lower 80s. A two standard deviation below normal trough establishes across eastern Canada Wednesday night through the balance of the week. This will return passing shortwave troughs permitting the return of precipitation under northwest flow. Much the case for this week, thunderstorm complexes could traverse the region given we are on the southern periphery of the trough, however confidence not high enough to warrant anything greater than climo pops. && .AVIATION /09Z SATURDAY THROUGH WEDNESDAY/... Restrictions will continue this morning as showers and thunderstorms cross the region. There is a chance of thunderstorms to develop later in the afternoon but will largely hinge on instability. At this time development looks less likely in the absence of a trigger and cloud coverage limiting surface- based instability. .OUTLOOK... Periodic restrictions are expected on Sunday in morning fog and daily rounds of thunderstorms. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. &&
Hazardous Weather Outlook National Weather Service Pittsburgh PA 422 AM EDT Sat Jul 22 2017 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029-031-073>076-WVZ001>004-012-021-509>514-230830- Garrett-Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson- Muskingum-Guernsey-Belmont-Noble-Monroe-Mercer-Venango-Forest- Lawrence-Butler-Clarion-Beaver-Allegheny-Armstrong-Indiana- Washington-Greene-Westmoreland-Westmoreland Ridges-Fayette- Fayette Ridges-Hancock-Brooke-Ohio-Marshall-Wetzel-Marion-Monongalia- Ridges of Eastern Monongalia and Northwestern Preston-Preston- Eastern Preston-Western Tucker-Eastern Tucker- 422 AM EDT Sat Jul 22 2017 This Hazardous Weather Outlook is for western Maryland, east central Ohio, northwest Pennsylvania, southwest Pennsylvania, west central Pennsylvania, western Pennsylvania, northern West Virginia and northern panhandle of West Virginia. .DAY ONE...Today and Tonight. Slight risk for severe thunderstorms. Main severe threat is damaging wind gusts. Small tornadoes are possible as well. Slight risk for excessive rainfall. Storms will be capable of producing heavy downpours which could result in localized flooding. .DAYS TWO THROUGH SEVEN...Sunday through Friday. Slight risk for severe thunderstorms Sunday afternoon and evening. Main severe threat is damaging wind gusts. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures.
The Cleveland radar (KCLE), 128 km away, was scanning. The volume nearest the first event began at 11:43 UTC.
6 thunderstorm wind. Local standard time, as filed.
Law enforcement reported a tree down on State Route 541.
Law enforcement reported a tree down on roadway.
Law enforcement reported a tree down on OH-16 near Franklin.
Law enforcement reported a tree down.
Law enforcement reported a tree down.
Law enforcement reported a tree down.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2017Every state in 2017This day in weather historyWarnings in Ohio, July 2017
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: 716937, 716938, 716939, 716940, 716941, 716942.