A crossing shortwave trough, as well as a remnant mesoscale convective vortex from convection the previous night, acted as a trigger for another round of severe thunderstorms on the 4th of June. Surface-based CAPE of 1500-2000 J/kg and deep-layer shear of 30-40 knots set up the region for organized severe weather.
Every event with a place to put it. Tap one for its entry below.
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 crossing shortwave trough, as well as a remnant mesoscale convective vortex from convection the previous night, acted as a trigger for another round of severe thunderstorms on the 4th of June. Surface-based CAPE of 1500-2000 J/kg and deep-layer shear of 30-40 knots set up the region for organized severe weather. Storms initiated in central Ohio around midday and then congealed into a line which swept across the upper Ohio Valley through the middle to late afternoon hours. Severe weather reports were mainly limited to tree and power line damage, with only a few reports of damage to structures and vehicles.
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 4, 12:21 PM EST, 48 minutes earlier.
Area Forecast Discussion National Weather Service Pittsburgh PA 121 PM EDT Thu Jun 4 2020 .SYNOPSIS... Showers and thunderstorms, a few of them possibly severe, will continue into the evening in a warm and humid air mass. Rain chances will continue through Saturday, when a cold frontal passage occurs. Dry weather is then forecast for Sunday and early next week. && .NEAR TERM /THROUGH TONIGHT/... Update...Severe Thunderstorm Watch 249 was issued across the majority of the CWA soon after this discussion was sent. The thinking remains the same overall. Previous... The old boundary which lay across the area this morning is inching northward this afternoon as warm, moist southwest flow continues. Showers and a few storms are continuing along it, although not strong yet. To the south of this boundary, a general lack of cloud cover has allowed destabilization to continue during the midday period. The combination of increasing CAPE, lingering outflow boundaries, and an MCV moving eastward in the Ohio Valley will allow shower/storm coverage to blossom over the next few hours, with likely PoPs needed over the bulk of the region. A relative minimum will be seen near the southeastern ridges, displaced from most boundaries and furthest away from the MCV. All of the CWA south of I-80 has been upgraded to a slight risk of severe thunderstorms by SPC. MLCAPE of 1000-2000 is expected this afternoon, along with mid- level dry air leading to enhanced surface delta theta-e values of 20 or higher, particularly from near Pittsburgh on south. Thus, downbursts with isolated damaging wind gusts remain a threat. CAPE profiles and shear are also sufficient to produce some modest storm organization/storm clusters, as well as some isolated instances of large hail. Slower moving storms may also pose a localized flooding threat, especially in more flood-prone urban areas. Shower and thunderstorm coverage will decrease overnight as diurnal stabilization occurs, although a few showers may linger near the southern CWA border. A relatively warm and muggy overnight period can be expected. && .SHORT TERM /FRIDAY THROUGH SATURDAY/... Whatever is left of the surface boundary will be north of the CWA come Friday morning. An approaching shortwave will help to spark showers and thunderstorms starting during the morning, with afternoon destabilization helping to keep scattered to numerous showers and thunderstorms going during the afternoon and evening. Warmer air aloft may keep overall CAPE values lower during the day, and overall shear levels will remain muted. Expect that these factors will lead to a lower risk of severe weather on Friday. Isolated heavy rain/flash flooding will remain possible though, as PWAT values on either side of 1.5 inches and the potential for relatively slow storm motions could result in localized issues. Surface low pressure swinging across Quebec Friday night will push a cold front across our region Friday night into Saturday morning, continuing shower and thunderstorm chances. With the diurnal loss of instability and with deeper moisture pulling east by 00Z Saturday, precipitation should remain rather benign overall. The boundary may stall just south of the Mason-Dixon Line on Saturday as low pressure crosses the Canadian Maritimes, and thus showers will remain possible mainly south of Pittsburgh. Temperatures will remain several degrees above normal through the period, with the main push of cooler air arriving with high pressure Saturday night. && .LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/... That high pressure center will remain in control for a good portion of the extended period, with dry weather expected from Saturday night through at least Tuesday. Cooler temperatures, near or just below normal, can be expected through Sunday night as the high centers itself over the region. A rebound back to above-normal values is expected by Tuesday. The forecast thereafter depends on the ultimate fate of Cristobal, currently expected to impact the western Gulf Coast by Monday. Current indications are that the remnants of that tropical system could get swept up by a trough ejecting from the southwest CONUS, which would return rain chances to the region by the middle of next week. Timing/intensity of that rain remains highly uncertain and will likely evolve in future model runs as Cristobal runs its course. && .AVIATION /17Z THURSDAY THROUGH MONDAY/... Scattered showers and thunderstorms will continue to develop into the evening. Cig/vis should largely remain VFR through the TAF period; however, brief period of MVFR/IFR vis may occur with mature storms. With low confidence on which sites will experience these conditions, the TEMPO for vis was not added to the forecast. Showers will linger into the evening and early tomorrow morning with elevated instability still at large. Residual low-level moisture will develop a shallow MVFR/IFR status deck before dawn tomorrow. Cigs will increase mid-morning with daytime mixing. .Outlook... Periodic restrictions in showers and thunderstorms are anticipated through tomorrow. A cold front will pass early Saturday. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. &&
Hazardous Weather Outlook National Weather Service Pittsburgh PA 1259 PM EDT Thu Jun 4 2020 MDZ001-PAZ007>009-WVZ012-021-509>514-051700- Garrett-Mercer-Venango-Forest-Wetzel-Marion-Monongalia- Ridges of Eastern Monongalia and Northwestern Preston-Preston- Eastern Preston-Western Tucker-Eastern Tucker- 1259 PM EDT Thu Jun 4 2020 This Hazardous Weather Outlook is for western Maryland, northwest Pennsylvania and northern West Virginia. .DAY ONE...This afternoon and tonight. Isolated strong to severe thunderstorms will be possible Thursday afternoon and evening. Hail and damaging winds will be the primary hazards with any severe storms. Locally heavy rainfall with these storms may create isolated flooding issues in more sensitive urban locations. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. Hazardous weather is not expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. OHZ039>041-048>050-057>059-068-069-PAZ013>016-020>023-029-031- 073>076-WVZ001>004-051700- Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson OH- Muskingum-Guernsey-Belmont-Noble-Monroe-Lawrence-Butler-Clarion- Jefferson PA-Beaver-Allegheny-Armstrong-Indiana-Washington-Greene- Westmoreland-Westmoreland Ridges-Fayette-Fayette Ridges-Hancock- Brooke-Ohio-Marshall- 1259 PM EDT Thu Jun 4 2020 ...SEVERE THUNDERSTORM WATCH 249 IN EFFECT UNTIL 8 PM EDT THIS EVENING... This Hazardous Weather Outlook is for east central Ohio, northwest Pennsylvania, southwest Pennsylvania, western Pennsylvania, northern West Virginia and the northern panhandle of West Virginia. .DAY ONE...This afternoon and tonight. Please listen to NOAA Weather Radio or go to weather.gov on the Internet for more information about the following hazards. Severe Thunderstorm Watch. Also, locally heavy rainfall with these storms may create isolated flooding issues, especially in more sensitive urban locations. .DAYS TWO THROUGH SEVEN...Friday through Wednesday. Hazardous weather is not expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
932 AM EDT THU JUN 04 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0858 AM TSTM WND DMG 2 N FISHER 41.29N 79.24W
06/03/2020 CLARION PA 911 CALL CENTER
TREES DOWN.
&&
EVENT NUMBER PBZ2001021
SKHPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
939 AM EDT THU JUN 04 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0945 AM TSTM WND DMG 1 NNW BOWERSVILLE 40.93N 78.87W
06/03/2020 JEFFERSON PA 911 CALL CENTER
TREE DOWN ON JACKSON RUN ROAD.
&&
EVENT NUMBER PBZ2001022
SKHPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
942 AM EDT THU JUN 04 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0930 AM TSTM WND DMG 1 SE PRESCOTTVILLE 41.08N 78.85W
06/03/2020 JEFFERSON PA 911 CALL CENTER
TREE DOWN ON WEST LIBERTY ROAD.
&&
EVENT NUMBER PBZ2001023
SKHPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
944 AM EDT THU JUN 04 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0904 AM TSTM WND DMG 4 E CLARINGTON 41.33N 79.05W
06/03/2020 JEFFERSON PA 911 CALL CENTER
POWER LINES DOWN ALONG RT. 949.
&&
EVENT NUMBER PBZ2001024
SKHPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PITTSBURGH PA
947 AM EDT THU JUN 04 2020
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0909 AM TSTM WND DMG 2 NNE ROSEVILLE 41.20N 79.14W
06/03/2020 JEFFERSON PA 911 CALL CENTER
TREE DOWN ALONG ROSEVILLE SIGEL ROAD.
&&
EVENT NUMBER PBZ2001025
SKHSpecial Weather Statement
National Weather Service Pittsburgh PA
127 PM EDT Thu Jun 4 2020
OHZ048-041800-
Coshocton-
127 PM EDT Thu Jun 4 2020
...A STRONG THUNDERSTORM CAPABLE OF PRODUCING HAIL AND GUSTY WIND
WILL AFFECT COSHOCTON COUNTY...
At 127 PM EDT, a strong thunderstorm was located 8 miles east of
Utica, or 14 miles southeast of Mount Vernon, moving northeast at 45
mph.
Wind gusts up to 45 mph and hail up to the size of nickels are
possible with this storm.
Locations impacted include...
Coshocton... West Lafayette...
Warsaw... Nellie...
Chili... Walhonding...
Layland... Bakersville...
Blissfield... New Guilford...
Cooperdale...
This storm may intensify, so monitor local radio or television
stations for additional information and possible warnings from the
National Weather Service.
LAT...LON 4041 8219 4045 8211 4044 8171 4037 8171
4037 8162 4030 8162 4016 8209 4017 8219
4024 8218 4025 8219 4028 8220
TIME...MOT...LOC 1727Z 238DEG 38KT 4025 8229The Cleveland radar (KCLE), 113 km away, was scanning. The volume nearest the first event began at 18:07 UTC.
7 thunderstorm wind. Local standard time, as filed.
The Coshocton Sheriff office reports that multiple trees were downed across the county.
Multiple instances of downed trees and power lines were reported along Strasburg-Bolivar Road and Ridge Road.
Muskingum County Dispatch reported that trees and power lines were down around the New Concord Area.
Carroll County Dispatch reported that multiple trees were blown down in the county.
Trees were reported down at the intersection of State Route 800 and Movarian Trail Road.
Trees were blown down in Wellsville.
A report of trees down was received from along River Road in East Liverpool.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2020Every state in 2020This day in weather historyWarnings in Ohio, June 2020
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: 903410, 905047, 905048, 905049, 905051, 905052, 905053.