A slow-moving frontal boundary draped across Ohio and Pennsylvania led to the development of thunderstorms during the afternoon and early evening. The storms produced scattered reports of flooding in portions of southwest Pennsylvania.
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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 slow-moving frontal boundary draped across Ohio and Pennsylvania led to the development of thunderstorms during the afternoon and early evening. The storms produced scattered reports of flooding in portions of southwest Pennsylvania.
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 8, 6:27 PM EST, 13 minutes earlier.
Area Forecast Discussion National Weather Service Pittsburgh PA 727 PM EDT Fri Jun 8 2018 .SYNOPSIS... A front will sink into the region tonight, and waver about our region through the weekend. Increasing shower and thunderstorm chances through Sunday will result as upper disturbances interact with the boundary. && .NEAR TERM /UNTIL 6 AM SATURDAY MORNING/... With 7:30pm update, increased pops to categorical in Allegheny and Washington counties where a line of nearly stationary thunderstorms has developed in the last hour. With 6:30pm update, increased pops for several counties across Ohio, including adding some categorical pops in stratiform rain. Thunderstorms may have hit their peak intensity for the day, with one warning issued about 45 minutes in eastern Ohio and storms having weakened slightly since that time. While the bulk of precipitation will fall across eastern Ohio, storms do stretch east into Pennsylvania as well. Previous discussion follows. Frontal boundary lies from central OH into northern PA currently. Storms are firing to the west in Ohio where greater instability lies, a few of which have become severe due to presence of dry air aloft and DCAPE availability. As the boundary continues to settle south tonight, isolated to scattered showers and storms should remain mainly confined to the southern portion of the CWA. Still cannot rule out one or two of the stronger storms reaching our Ohio counties before instability wanes this evening. Some CAMs are hinting at continued elevated convection through much of the night south of the boundary. Elected to increase PoPs into the chance range south of Pittsburgh tonight, with too much remaining uncertainty to pinpoint exact areas. Although instability will be low, lingering moisture and ripples in the flow lend credence to this low probabilities. Above-normal low temperatures were maintained given the clouds and moisture present. && .SHORT TERM /6 AM SATURDAY MORNING THROUGH SUNDAY NIGHT/... Although the models agree that the frontal boundary will linger across the region on Saturday, the NAM becomes an outlier by Sunday with a much stronger and further north surface low crossing our area by Monday, as opposed to a weaker center closer to the middle Ohio Valley. Will thus discount the more amplified solution for now. Nevertheless, likely PoPs remain justified during peak heating times of both Saturday and Sunday with continued shortwave passages and the presence of the front. PoPs drop off during the nighttime hours given instability loss. SPC maintained a marginal severe risk for Saturday afternoon/evening ahead of the front. This seems reasonable given that the overall wind field may be a bit too weak for much storm organization, but enough instability and sufficiently steep lapse rates may exist, along with mid-level dry air, for a severe storm or two. Likewise, any flood threat should remain localized. Although PWAT values are quite high, FFG values are as well, and it will probably require an area to get hit a few times for any excessive rainfall issues. Moisture and cloud cover should keep diurnal temperature ranges fairly small, with continued above normal max and min values. && .LONG TERM /MONDAY THROUGH FRIDAY/... Some uncertainty exists in the long term, as the front may not fully exit the region by Monday. Added some low PoPs back into the forecast, especially across the south. Zonal flow continues into midweek, when a frontal passage may provide at least a brief dry interlude. Another shortwave may arrive for the end of the week. && .AVIATION /00Z SATURDAY THROUGH WEDNESDAY/... Prevailing VFR is expected through the evening, though showers and thunderstorms, developing along a warm front, may bring brief restrictions to the terminals south of I-70. Didn't stray much from the previous forecast with VCTS mentioned at ZZV and MGW and left out of all other locations until tomorrow with greater confidence in coverage. Some hi-res models suggest storms may develop and cross overnight but have opted not to carry these for now with low confidence in placement. Increasing low level moisture supports the development of fog at several sites overnight, though there may be just enough surface flow to limit IFR. For now, continued the MVFR mention, though it is likely IFR will occur where any thunderstorm passes. OUTLOOK... Restrictions will be possible in morning through the weekend and again in any thunderstorms that pass over a TAF site. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. &&
Hazardous Weather Outlook National Weather Service Pittsburgh PA 317 AM EDT Fri Jun 8 2018 MDZ001-OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023- 029-031-073>076-WVZ001>004-012-021-509>514-090730- 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- 317 AM EDT Fri Jun 8 2018 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. No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...Saturday through Thursday. The probability for widespread hazardous weather is low. .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 528 PM EDT FRI JUN 8 2018 OHZ048-082215- Coshocton- 528 PM EDT FRI JUN 8 2018 ...A STRONG THUNDERSTORM CAPABLE OF PRODUCING HAIL...GUSTY WIND AND HEAVY RAIN WILL AFFECT NORTHWESTERN COSHOCTON COUNTY... At 527 PM EDT, a strong thunderstorm was located near Killbuck, or 8 miles southwest of Millersburg, moving south at 10 mph. Wind gusts up to 45 mph and hail up to the size of nickels are possible with this storm. Locations impacted include... Coshocton... Warsaw... Nellie... Walhonding... Layland... Blissfield... New Guilford... Torrential rainfall also is occurring with this storm and may cause localized flooding. Do not drive your vehicle through flooded roadways. LAT...LON 4045 8218 4045 8189 4026 8184 4026 8219 TIME...MOT...LOC 2127Z 342DEG 8KT 4047 8204 SKH
Special Weather Statement National Weather Service Pittsburgh PA 613 PM EDT FRI JUN 8 2018 OHZ050-PAZ029-WVZ001-002-082315- Jefferson-Washington-Brooke-Hancock- 613 PM EDT FRI JUN 8 2018 ...A STRONG THUNDERSTORM CAPABLE OF PRODUCING HAIL...GUSTY WIND AND HEAVY RAIN WILL AFFECT NORTHEASTERN JEFFERSON...NORTHWESTERN WASHINGTON...NORTHEASTERN BROOKE AND SOUTHEASTERN HANCOCK COUNTIES... At 612 PM EDT, a strong thunderstorm was located over Steubenville, moving southeast at 15 mph. Wind gusts up to 45 mph and hail up to the size of nickels are possible with this storm. Locations impacted include... Weirton... Steubenville... Wellsburg... Avella... Toronto... Wintersville... Mingo Junction... Follansbee... Hooverson Heights... New Cumberland... Burgettstown... Franklin... Torrential rainfall also is occurring with this storm and may cause localized flooding. Do not drive your vehicle through flooded roadways. LAT...LON 4045 8034 4019 8049 4038 8076 4051 8069 TIME...MOT...LOC 2212Z 292DEG 5KT 4040 8065
Special Weather Statement National Weather Service Pittsburgh PA 641 PM EDT FRI JUN 8 2018 PAZ021-029-082315- Washington-Allegheny- 641 PM EDT FRI JUN 8 2018 ...A STRONG THUNDERSTORM CAPABLE OF PRODUCING SMALL HAIL AND GUSTY WIND WILL AFFECT CENTRAL WASHINGTON AND SOUTHWESTERN ALLEGHENY COUNTIES... At 641 PM EDT, a strong thunderstorm was located over Cecil-Bishop, or near Canonsburg, moving southeast at 15 mph. Wind gusts up to 55 mph and small hail are possible with this storm. Locations impacted include... Pittsburgh... Mount Lebanon... Bethel Park... McMurray... McKeesport... Canonsburg... Gastonville... West Mifflin... Baldwin... Upper St. Clair... Scott Township... Whitehall... This includes the following highways... Interstate 70 in Pennsylvania between mile markers 27 and 32. Interstate 79 in Pennsylvania between mile markers 22 and 30. Frequent cloud to ground lightning is occurring with this storm. Seek safe shelter inside a building or vehicle. LAT...LON 4030 8033 4046 8023 4036 7986 4012 8002 TIME...MOT...LOC 2241Z 297DEG 11KT 4034 8017
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
727 PM EDT FRI JUN 08 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0720 PM FLASH FLOOD 1 WNW ROSWELL 40.48N 81.36W
06/08/2018 TUSCARAWAS OH 911 CALL CENTER
5000 BLOCK OF ECHO LAKE ROAD IS IMPASSABLE.
&&
EVENT NUMBER PBZ1803079
SKHThe Pittsburgh radar (KPBZ), 18 km away, was scanning. The volume nearest the first event began at 23:38 UTC.
4 flood, 3 flash flood. Local standard time, as filed.
County 911 officials reported that Water was entering some businesses in McDonald.
Parts of Highway 980 between McDonald and Cecil were reported by county 911 officials to be impassable due to flooding.
Flooding was reported at the intersection of Mayview Road and Boyce Road by a member of the public.
Residential flooding was reported on Pittsburgh Street in West Newton by county 911 officials.
County 911 officials reported residential flooding on Fitz Henry Road.
Flooding was reported on North State Street near Ostermayer Avenue by county 911 officials.
County 911 officials reported roadway flooding at 1441 Boston Hollow Road.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Pennsylvania in 2018Every state in 2018This day in weather historyWarnings in Pennsylvania, June 2018
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: 765377, 765380, 765381, 765378, 765379, 765382, 765383.