Shortwave digging through an upper trough helped to develop two convective systems that crossed the upper Ohio Valley on the 10th. Moderate instability and shear provided for intensification of the second system over central and eastern Ohio but both produced scattered reports of wind damage.
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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.
Shortwave digging through an upper trough helped to develop two convective systems that crossed the upper Ohio Valley on the 10th. Moderate instability and shear provided for intensification of the second system over central and eastern Ohio but both produced scattered reports of wind damage. An EF-0 tornado was also confirmed in Beaver county, Pennsylvania that then continued into Butler county.
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 Jul 10, 1:34 PM EST, 38 minutes earlier.
Area Forecast Discussion National Weather Service Pittsburgh PA 234 PM EDT Mon Jul 10 2017 .SYNOPSIS... Shower and thunderstorm chances will continue through the week as a series of disturbances roll through. && .NEAR TERM /THROUGH TUESDAY/... Immediate concern is convection/MCV moving across Ohio. Southwest flow ahead of the system is pulling higher dewpoints up along the Ohio River into eastern Ohio, which has helped pull higher CAPE into the western CWA. Last few runs of the HRRR have kept this richer instability bottled up west of the PA/OH border, with the advancing convection cutting off the moisture feed before it can destabilize things in PA/much of northern WV. Given the HRRR's struggles earlier, and given the strength of the convection in northern Ohio, am a little concerned that the forecast instability's eastward extent may be a bit underplayed. SPC's slight risk area extends as far east as PIT and FKL, and this may end up being a good depiction, with wind gusts the primary threat, along with some hail. Will need to watch rainfall amounts locally as well. In any case, kept higher PoPs in the northeast 2/3rds of the CWA, with some expectation of weakening further east and south due to the lower CAPE forecast. The overnight forecast is complicated by the eventual fate of the afternoon convection and any boundaries that it can leave behind. However, did favor the northern counties with higher PoPs due to that area's proximity further in the trough and closer to the track of any weak shortwaves in the flow. Warm and somewhat humid conditions overnight will be followed by seasonable temperatures Tuesday. && .SHORT TERM /TUESDAY NIGHT THROUGH THURSDAY/... Did not make any major changes to this period, owing to the ongoing uncertainty of this mesoscale-driven pattern. Mid-level troughing will gradually transition to a more zonal flow regime, with rising 500 mb heights pointing to a continued warm and humid trend. Waves in this flow will continue to be difficult to time, and decided to continue with a PoP pattern similar to the previous forecast, with a diurnal trend in precipitation chances. Models continue to depict a more organized shortwave on Thursday, with support for more widespread and concentrated rainfall. Will keep likely PoPs going for this period. Frontal passage will likely occur during the Thursday night timeframe. Temperatures will run a bit above climatology, especially at night, in the humid air mass. && .LONG TERM /THURSDAY NIGHT THROUGH SUNDAY/... The upper trough will become reestablished during this period behind the front, which should cross in the Thursday night-Friday period. Surface ridging should allow us to eek out a dry period Friday night and Saturday. Another wave and front look possible for Sunday, but timing remains uncertain. For now, dry weather is expected Monday with a transition to an upper ridging pattern, which could hold into the middle of next week. Fairly seasonable temperatures are expected for the extended period. && .AVIATION /18Z MONDAY THROUGH SATURDAY/... As one area of showers across Pennsylvania and West Virginia is diminishing in coverage, another area of showers/thunderstorms across central Ohio is making its way east. Although there are indications that the line is weakening somewhat as it approaches the region, have still included tempo groups with gusty winds and reduced visibilities at several TAF sites. Synoptic and high resolution models have had a very tough time today resolving how overall coverage of showers/storms will develop, even with the current line of storms across Ohio, and have gone with a general broadbrush of VCSH for the overnight hours. There is a bit of consensus that lower ceilings should move into northern terminals late tonight into Tuesday morning, and have added MVFR cigs at FKL/DUJ/BVI. .OUTLOOK... The potential for restrictions will persist through much of the week as daily rounds of showers and storms are expected. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...None. OH...None. PA...None. WV...None. &&
Hazardous Weather Outlook National Weather Service Pittsburgh PA 243 PM EDT Mon Jul 10 2017 MDZ001-PAZ009-015-016-022-023-031-073>076-WVZ012-021-509>514-111845- Garrett-Forest-Clarion-Jefferson-Armstrong-Indiana-Greene- Westmoreland-Westmoreland Ridges-Fayette-Fayette Ridges-Wetzel- Marion-Monongalia- Ridges of Eastern Monongalia and Northwestern Preston-Preston- Eastern Preston-Western Tucker-Eastern Tucker- 243 PM EDT Mon Jul 10 2017 This Hazardous Weather Outlook is for western Maryland, northwest Pennsylvania, southwest Pennsylvania, west central Pennsylvania and northern West Virginia. .DAY ONE...This Afternoon and Tonight. Scattered strong to severe thunderstorms are possible into this evening. The main threat will be damaging wind gusts, although large hail is also a possibility. Heavy downpours may cause localized water issues as well. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. No hazardous weather is expected at this time. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time. OHZ039>041-048>050-057>059-068-069-PAZ007-008-013-014-020-021-029- WVZ001>004-111845- Tuscarawas-Carroll-Columbiana-Coshocton-Harrison-Jefferson-Muskingum- Guernsey-Belmont-Noble-Monroe-Mercer-Venango-Lawrence-Butler-Beaver- Allegheny-Washington-Hancock-Brooke-Ohio-Marshall- 243 PM EDT Mon Jul 10 2017 This Hazardous Weather Outlook is for east central Ohio, northwest Pennsylvania, southwest Pennsylvania, west central Pennsylvania, western Pennsylvania, northern West Virginia and northern panhandle of West Virginia. .DAY ONE...This Afternoon and Tonight. Isolated strong to severe thunderstorms are possible into this evening. The main threat will be damaging wind gusts, although large hail is also a possibility. Heavy downpours may cause localized water issues as well. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday. 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
234 PM EDT MON JUL 10 2017
OHZ039>041-PAZ007-013-101930-
Tuscarawas-Columbiana-Carroll-Lawrence-Mercer-
234 PM EDT MON JUL 10 2017
...A LINE OF THUNDERSTORMS WITH GUSTY WIND WILL AFFECT
COLUMBIANA...CARROLL...NORTHERN TUSCARAWAS...SOUTHERN MERCER AND
WESTERN LAWRENCE COUNTIES...
At 232 PM EDT, radar indicated thunderstorms along a line extending
from 7 miles south of Ravenna to near North Canton to near
Sugarcreek. Movement was east at 45 mph.
Wind gusts of 45 to 50 mph are possible with this line.
Locations impacted include...
New Castle... New Philadelphia...
Hermitage... Sharon...
Dover... Salem...
Columbiana... East Palestine...
Sharpsville... Wellsville...
Carrollton... Farrell...
This includes the following highways...
Pennsylvania Turnpike between mile markers 1 and 6.
Interstate 77 in Ohio between mile markers 78 and 93.
Interstate 79 in Pennsylvania between mile markers 90 and 96.
Interstate 80 in Pennsylvania between mile markers 0 and 18.
LAT...LON 4131 8009 4095 8034 4085 8043 4085 8052
4076 8052 4058 8069 4060 8086 4056 8086
4056 8092 4044 8094 4046 8167 4064 8164
4065 8124 4072 8124 4073 8109 4090 8108
4093 8082 4090 8082 4090 8052 4130 8052
TIME...MOT...LOC 1832Z 262DEG 39KT 4105 8119 4085 8137 4054 8165
15The Pittsburgh radar (KPBZ), 64 km away, was scanning. The volume nearest the first event began at 19:10 UTC.
5 thunderstorm wind. Local standard time, as filed.
State official reported trees down.
Law enforcement reported numerous trees and a few power lines down.
Law Enforcement reported trees down.
Law enforcement reported trees down.
Law enforcement reported trees down.
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, July 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: 716405, 716406, 716407, 716408, 716409.