Increasing instability and modest shear, along with a passing upper trough and associated front, supported strong to severe storms across northern Pennsylvania on the 18th. Isolated damage also was reports in eastern Ohio and northern West Virginia.
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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.
Increasing instability and modest shear, along with a passing upper trough and associated front, supported strong to severe storms across northern Pennsylvania on the 18th. Isolated damage also was reports in eastern Ohio and northern West Virginia.
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 18, 12:59 PM EST, 1 hour 2 minutes earlier.
Area Forecast Discussion National Weather Service Pittsburgh PA 159 PM EDT Sun Jun 18 2017 .SYNOPSIS... Widespread thunderstorms are expected this afternoon and evening with the approach of a cold front. Less humid and cooler weather is forecast early next week. && .NEAR TERM /THROUGH TONIGHT/... According to the latest mesoanalysis...MLCAPE approaching 1500j/kg and effective shear of 30kts lies along an axis from about ZZV to PIT northward to KFKL. This is where thunderstorms have developed, which is in line with this mornings run of the HRRR and also supports the severe thunderstorm watch that has been issued for OH/PA/NY this afternoon. Expect storms to continue to move northeastward through the afternoon and evening with support from an upper level shortwave. Strong/Severe wind will remain the greatest threat through the evening, but heavy rain will also be a concern, especially as we go into the evening hours. Severe threat should diminish with weakening instability overnight but several waves riding along the slow- moving boundary will keep rain chances in through Monday morning for most of the area. In addition and probably more important than the severe threat, will be localized flooding concerns as PWATs increase this evening and overnight. This would allow any convection to be very efficient in producing heavy rainfall and, with the slow movement of the boundary, several bouts of convection may train over the same area. Further increasing the risk, is the already saturated ground, and many area streams and creeks that are still running high. Will need to monitor threat for a short- fused flash flood watch, over areas that have seen several rounds of rain in the last week. && .SHORT TERM /MONDAY THROUGH WEDNESDAY/... Front will finally be south of the ridges around noon Monday, but a shortwaves digging through the upper trough may support scattered showers/storms each afternoon through midweek. Surface ridging may keep the best chances to north of PIT by Wednesday. Upper trough will keep temperatures a degree or two below seasonal averages Monday, but moderation back to normal is expected by midweek. && .LONG TERM /WEDNESDAY NIGHT THROUGH SATURDAY/... Although the deep moisture is vacated, a mean upper trough will be maintained in the Great Lakes region. This trough will create a progressive flow across the Ohio Valley, leading to daily chances for showers and storms through much of the week. By Thursday, temperature will rebound to slightly above-normal value as low-level moisture increases. The highest chance for showers and storms will come toward the end of the long term with the passage of a frontal boundary. && .AVIATION /18Z SUNDAY THROUGH FRIDAY/... High confidence forecast until a front approaches later this afternoon where timing of showers and storms could vary by a few hours either way. Showers and storms have developed and will move through the region this afternoon and evening. There will be brief periods of MVFR, however opted for VCTS and prevailing SHRA at all terminals. Overnight confidence decreases as a series of showers cross bringing MVFR vis and IFR cigs to most terminals. Given upstream conditions this morning, elected to carry IFR at higher frequency terminals and low end MVFR elsewhere. Rain should stop between 9-14Z Monday with a slow improvement to VFR at the vary end of the terminals. Gusty southwest winds will continue until this evening then speeds will subside below 10kts. In the meantime, gusts from the 210-230 direction upwards of 30 kts are possible except higher in thunderstorms. .Outlook... Brief restrictions are possible through mid week as upper level disturbances pass. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. &&
Hazardous Weather Outlook National Weather Service Pittsburgh PA 413 AM EDT Sun Jun 18 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>514-190815- 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- 413 AM EDT Sun Jun 18 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 this afternoon and evening. The main severe threat is damaging winds and large hail. Thunderstorms will be capable of producing heavy rain, which could lead to flooding. This threat means there is a slight risk for excessive rainfall this afternoon and evening as well. .DAYS TWO THROUGH SEVEN...Monday through Saturday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Weather spotters are encouraged to report significant weather conditions according to Standard Operating Procedures.
Special Weather Statement National Weather Service Pittsburgh PA 251 PM EDT SUN JUN 18 2017 OHZ041-050-PAZ020-WVZ001-181915- Jefferson-Columbiana-Beaver-Hancock- 251 PM EDT SUN JUN 18 2017 ...A LINE OF THUNDERSTORMS CAPABLE OF PRODUCING GUSTY WIND WILL AFFECT NORTHEASTERN JEFFERSON...SOUTHEASTERN COLUMBIANA...WESTERN BEAVER AND NORTHERN HANCOCK COUNTIES... At 249 PM EDT, a line of thunderstorms was located over Wellsville, moving east at 40 mph. Wind gusts up to 50 mph are possible with this line of storms. Locations impacted include... East Liverpool... Aliquippa... Beaver Falls... Monaca... Wellsville... Ambridge... New Brighton... Beaver... Calcutta... Baden... Rochester... Ohioville... This includes Pennsylvania Turnpike between mile markers 15 and 17. This storm may intensify, so monitor local radio or television stations for additional information and possible warnings from the National Weather Service. A severe thunderstorm watch remains in effect until 900 PM EDT for east central Ohio...western and southwestern Pennsylvania...and northern West Virginia. LAT...LON 4049 8075 4070 8074 4081 8025 4057 8023 TIME...MOT...LOC 1849Z 255DEG 33KT 4059 8069 15
The Pittsburgh radar (KPBZ), 44 km away, was scanning. The volume nearest the first event began at 19:01 UTC.
1 thunderstorm wind. Local standard time, as filed.
State official reported several trees down on a house causing roof damage. A lady was struck in the head by a falling tree.
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, June 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: 711620.