A passing upper level trough with strong mid-level flow and diurnal heating under a moist low-level airmass helped generate severe storms across the Ohio River Valley. Effective bulk shear was 30-40kts and supported storm organization.
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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 passing upper level trough with strong mid-level flow and diurnal heating under a moist low-level airmass helped generate severe storms across the Ohio River Valley. Effective bulk shear was 30-40kts and supported storm organization. ML CAPE ranged from 1000-2000J/kg by mid-afternoon, steep lapse rates helped efficient downdraft acceleration.
Training storms also created localized flooding along a convergence axis from southeast Ohio to southwest PA.
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 30, 8:24 AM EST, 3 hours 12 minutes earlier.
Area Forecast Discussion National Weather Service Pittsburgh PA 924 AM EDT Wed Jun 30 2021 .SYNOPSIS... Warm and humid conditions will give way to showers and storms this afternoon. Cooler weather is expected over the weekend. && .NEAR TERM /THROUGH TONIGHT/... Conditions today started with convection along the lake boundary to the north with showers and thunderstorms tracking across I-80. This convection has decreased as of 13Z with just a few showers left over. Some remnant outflows were noticeable as of 12Z on radar. this area just south of I-80 will serve as a focal point for redevelopment after noon with a timing of 17Z to 18Z. The morning 12Z PIT sounding indicates an MU CAPE of 1400 J/Kg with nearly 1000 J/Kg of DCAPE. A subtle warm layer and cap at 700MB will hinder development a bit. A approach of the front will likely overcome this this with MU CAPE bubbling to around 3000 J/Kg. This will likely depend on how fast the front slides south. With this concern, wind gusts and flooding will be the main concerns. Nevertheless, have added pops through the afternoon period and into the overnight as the front will keep convection going into the early morning hours. Slightly slow storm motions, PWATs in the 1.6 to 1.7 range, and the potential of training due to the orientation of the front, the threat of flooding is a concern. Will discuss the potential for a Flash Flood Watch. && .SHORT TERM /THURSDAY THROUGH FRIDAY NIGHT/... Occasional showers and storms will continue Thursday and Friday as a cold front crosses Thursday and the aforementioned upper trough continues to deepen and pivots over the forecast area. Cooler temperatures are forecast through the period with CAA behind the front. Forecast values were heavily weighted on direct model output and are lower than MOS and blends which would incorporate a warm bias due to recent weather. && .LONG TERM /SATURDAY THROUGH TUESDAY/... Shower chances and cooler temperature continue Saturday with the upper low over the forecast area...followed by drier conditions and near normal temperatures on INdependence Day as high pressure builds in from the west. && .AVIATION /14Z WEDNESDAY THROUGH SUNDAY/... High pressure will maintain VFR until a pre-frontal shortwave prompts widespread shower and thunderstorm development this afternoon/evening. TEMPO TSRA are included for most ports this in anticipation. Gusty winds, lightning, and hail are possible with these thunderstorms. MVFR/IFR cigs and vis are expected early tomorrow morning under cold advection. .Outlook... Occasional restrictions are expected through Friday as a troughing pattern results in periodic moist convection. && .PBZ WATCHES/WARNINGS/ADVISORIES... PA...None. OH...None. WV...None. &&
Hazardous Weather Outlook National Weather Service Pittsburgh PA 1215 PM EDT Wed Jun 30 2021 OHZ039>041-048>050-057>059-068-069-PAZ007>009-013>016-020>023-029- 031-073>076-WVZ001>004-012-021-509>514-011615- Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson OH- Muskingum-Guernsey-Belmont-Noble-Monroe-Mercer-Venango-Forest- Lawrence-Butler-Clarion-Jefferson PA-Beaver-Allegheny-Armstrong- Indiana-Washington-Greene-Westmoreland- Higher Elevations of Westmoreland-Fayette- Higher Elevations of Fayette-Hancock-Brooke-Ohio-Marshall-Wetzel- Marion-Monongalia- Ridges of Eastern Monongalia and Northwestern Preston-Preston- Eastern Preston-Western Tucker-Eastern Tucker- 1215 PM EDT Wed Jun 30 2021 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. Strong to severe thunderstorms will be possible this afternoon and evening. Damaging winds will be the main threat. Localized flooding will also be possible. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. Excessive rainfall may lead to instances of flooding Thursday and Thursday night. .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
1157 AM EDT Wed Jun 30 2021
OHZ048-057-301630-
Coshocton-Muskingum-
1157 AM EDT Wed Jun 30 2021
...AN AREA OF STRONG THUNDERSTORMS CAPABLE OF PRODUCING GUSTY WIND
WILL AFFECT SOUTHWESTERN COSHOCTON AND MUSKINGUM COUNTIES...
At 1157 AM EDT, strong thunderstorms were clustered near Hanover, or
10 miles east of Newark, moving east at 30 mph.
Wind gusts up to 45 mph are possible with this storm.
Locations impacted include...
Zanesville... South Zanesville...
North Zanesville... Dresden...
Frazeysburg... Philo...
Warsaw... Pleasant Grove...
Conesville... Fultonham...
Nellie... Chandlersville...
This includes Interstate 70 in Ohio between mile markers 145 and 165.
This storm may intensify, so monitor local radio or television
stations for additional information and possible warnings from the
National Weather Service.
LAT...LON 3993 8223 3993 8220 4021 8218 4021 8219
4024 8218 4024 8220 4031 8219 4038 8202
4015 8184 3988 8180 3982 8210 3982 8216
3991 8216 3991 8223
TIME...MOT...LOC 1557Z 251DEG 25KT 4012 8224The Cleveland radar (KCLE), 160 km away, was scanning. The volume nearest the first event began at 16:39 UTC.
13 thunderstorm wind. Local standard time, as filed.
Social media report of downed lines on Country Club Road in Zanesville. Time estimated based on radar.
Fire department reported tree down on home on Norwood Blvd.
Broadcast Media report of a large tree down on Dresden Road.
A 911 Call Center reported numerous trees and power lines down across the town.
Social media report of trees falling due to wind estimated at 60mph.
A Fire Chief reported tree down on power lines on Russel Drive.
Broadcast Media reported multiple trees down at the intersection of Lane and Bell Run Rd near Adamsville.
A 911 Call Center reported trees and power lines down along Route 209W at Byesville. Also, trees down on Peters Creek Road at Castle Station VFD.
An Emergency Manager reported trees in power lines in Barnesville area.
Public report of large tree down.
An Emergency Manager reported multiple trees down over County Road 10 in Lafferty.
Broadcast Media reported multiple trees down along Willow Grover Road.
Social media report of gutter damage, large tree branches down, and tree split.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Ohio in 2021Every state in 2021This day in weather historyWarnings in Ohio, June 2021
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: 987642, 987643, 987644, 987645, 987647, 987651, 987652, 987646, 987648, 987653, 987649, 987650, 987654.