Shower and thunderstorm coverage increased with the approach of a shortwave trough. However, intensity was rather limited by marginal instability, warm mid levels, and relatively weak forcing.
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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.
Shower and thunderstorm coverage increased with the approach of a shortwave trough. However, intensity was rather limited by marginal instability, warm mid levels, and relatively weak forcing. As a result, only a few isolated storms became strong to severe.
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 May 26, 3:16 PM EST, 2 hours 34 minutes earlier.
Area Forecast Discussion National Weather Service Pittsburgh PA 416 PM EDT Sat May 26 2018 .SYNOPSIS... Warm and humid weather can be expected for the remainder of the holiday weekend, but rain chances should decline on Monday. && .NEAR TERM /UNTIL 6 AM SUNDAY MORNING/... Shower and thunderstorm coverage is expected to increase this evening with approach of a shortwave trough; however, intensity will be limited by marginal instability, compromised by warm mid levels, as well as relatively weak forcing and an overall weak wind field. These limitations will be offset by an increasing moisture profile and eventually warm rain processes as the warm is projected to exceed 10 kft later this eve. Conditions thus look favorable for locally heavy downpours. The moisture will limit the temperature dropoff so overnight lows were again progged well above the averages. && .SHORT TERM /6 AM SUNDAY MORNING THROUGH TUESDAY/... Showers and storm coverage will diminish on Sunday in the wake of the shortwave, passage of which will not degrade regional warmth and humidity. Convection potential for Monday and Tuesday looks to be capped as broad upper high pressure builds over the region. Pattern thus favors continued above average temperature. && .LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/... Warm and humid conditions are expected through the extended with daily chances for showers and storms as low pressure currently over the gulf is progged to impact the region during the second half of the week. && .AVIATION /20Z SATURDAY THROUGH THURSDAY/... Sct to nmrs shra and tsra will plague the region tonight as a shortwave trough crosses the region. Expect MVFR with lcl IFR in locally heavy rainfall. Terminals that receive rainfall will have the better chance for persistent restriction in the form of fog and stratus through the peri-dawn of Sunday. Improvement back to VFR is then expected through midday Sunday with declining shower activity. OUTLOOK... General VFR can be expected into midweek outside of isolated to scattered convection. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. && 15
Hazardous Weather Outlook National Weather Service Pittsburgh PA 416 AM EDT Sat May 26 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>514-270830- 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- 416 AM EDT Sat May 26 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...Sunday through Friday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Special Weather Statement
National Weather Service Pittsburgh PA
509 PM EDT SAT MAY 26 2018
OHZ039>041-049-050-262145-
Jefferson-Tuscarawas-Harrison-Columbiana-Carroll-
509 PM EDT SAT MAY 26 2018
...A STRONG THUNDERSTORM CAPABLE OF PRODUCING HAIL WILL AFFECT
NORTHEASTERN HARRISON...NORTHWESTERN JEFFERSON...SOUTHWESTERN
COLUMBIANA...CARROLL AND NORTHEASTERN TUSCARAWAS COUNTIES...
At 508 PM EDT, a strong thunderstorm was located near Waynesburg, or
10 miles west of Carrollton, moving east at 25 mph.
Hail up to the size of nickels is possible with this storm.
Locations impacted include...
Carrollton... Salineville...
Malvern... Mineral City...
Bergholz... Amsterdam...
Dellroy... Sherrodsville...
Mechanicstown... Atwood Lake...
Kilgore... Leesville Lake Park...
LAT...LON 4065 8136 4065 8124 4070 8124 4062 8080
4036 8093 4054 8141
TIME...MOT...LOC 2108Z 290DEG 22KT 4061 8128
SKHSpecial Weather Statement
National Weather Service Pittsburgh PA
559 PM EDT SAT MAY 26 2018
OHZ057-262245-
Muskingum-
559 PM EDT SAT MAY 26 2018
...A STRONG THUNDERSTORM CAPABLE OF PRODUCING SMALL HAIL AND HEAVY
RAIN WILL AFFECT SOUTHERN MUSKINGUM COUNTY...
At 558 PM EDT, a strong thunderstorm was located near South
Zanesville, or 7 miles southwest of Zanesville, moving east at 20
mph.
Torrential rainfall also is occurring with this storm and may cause
localized flooding. Do not drive your vehicle through flooded
roadways.
Small hail is possible with this storm.
Locations impacted include...
Zanesville... New Concord...
South Zanesville... North Zanesville...
Philo... Pleasant Grove...
Fultonham... Norwich...
Cannelville... High Hill...
Chandlersville... Ruraldale...
This includes Interstate 70 in Ohio between mile markers 145 and
169.
LAT...LON 4001 8173 3976 8173 3977 8207 3982 8208
3982 8217 3991 8216 3991 8219 3998 8219
TIME...MOT...LOC 2158Z 265DEG 15KT 3985 8210The Cleveland radar (KCLE), 100 km away, was scanning. The volume nearest the first event began at 22:50 UTC.
1 thunderstorm wind. Local standard time, as filed.
County official reported trees and power lines down and barn roof damage immediately north of Dover.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2018Every state in 2018This day in weather historyWarnings in Ohio, May 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: 761229.