A weak upper level disturbance interacted with a moist atmosphere to produce isolated strong thunderstorms with heavy rain.
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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 ILN wrote it up.
A weak upper level disturbance interacted with a moist atmosphere to produce isolated strong thunderstorms with heavy rain.
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 Wilmington, OH wrote its last area forecast discussion before the first event at Aug 2, 3:05 PM EST, 2 hours 24 minutes earlier.
Area Forecast Discussion National Weather Service Wilmington OH 405 PM EDT Wed Aug 2 2017 .SYNOPSIS... Daytime heating will result in scattered showers and thunderstorms the rest of the afternoon and then again Thursday. More storms can be expected as a cold front moves through the area on Friday. High pressure will build in for the weekend. && .NEAR TERM /UNTIL 6 AM THURSDAY MORNING/... Scattered storms will continue through the late afternoon and diminish with the loss of heating early this evening. Locally heavy rainfall and gusty winds with minor downbursts will remain possible. Beyond early evening, expect little to no activity with partly cloudy skies. Lows will be a bit warmer than last night. && .SHORT TERM /6 AM THURSDAY MORNING THROUGH THURSDAY NIGHT/... Weak troughing will persist across the region with minor disturbances moving through it. This will result in additional scattered showers and thunderstorms, primarily in the afternoon. However, there is the possibility of some activity lingering into the night in the northwest counties. Weak wind fields will result in unorganized storms with locally heavy rainfall and gusty winds the primary concern. Highs should be close to persistence. Lows will be in the mid to upper 60s. && .LONG TERM /FRIDAY THROUGH WEDNESDAY/... A fairly strong mid level short wave embedded in a broader upper level trough will pivot east across the southern Great Lakes Friday into Friday night. This will help drive an associated cold front east across the upper Ohio Valley through the day on Friday. The last couple of model runs have trended somewhat slower with the frontal passage and as as a result, our area will be in a somewhat more favorable position for thunderstorm development. As we destabilize ahead of the front through late morning and into the early afternoon, expect to see an increase in coverage along and ahead of the front across our area. Precipitation should then taper off fairly quickly from west to east through the mid to late afternoon hours as the front moves east. Mid and deep layer shear will be on the increase along and ahead of the front as wind fields increase ahead of the short wave. This will combine with the slower timing of the front to increase our severe threat, particularly across our eastern areas where the better instabilities should exist through mid afternoon. High pressure and a cooler, drier airmass will build in behind the front for the weekend. Highs on Saturday and Sunday will mainly be in the mid to upper 70s with morning lows in the mid to upper 50s. The 12Z GFS has trended faster with the approach of the next trough axis early next week but it is still slower than the past several runs of the ECMWF. As a result, will speed up pcpn chances heading into Sunday night and then linger a chance through the day on Monday. With the faster timing, will also go ahead and dry us out Tuesday into Wednesday. High temperatures will remain in the mid to upper 70s through mid week. && .AVIATION /20Z WEDNESDAY THROUGH MONDAY/... Scattered convection will occur during the early part of the TAF period. Difficult to time when these might affect any of the terminals, so maintained VCTS but tried to limited it to the hours when coverage would be greatest and therefore having the better chance of impacting the TAF sites. Some cumulus may linger through the night, although many places will clear. There will be an increase in cumulus towards 12Z and beyond. Scattered showers and thunderstorms will redevelop, but that far out in time have opted not to include mention of precipitation in the TAFs. OUTLOOK...Thunderstorms are possible Thursday afternoon through Friday. && .ILN WATCHES/WARNINGS/ADVISORIES... OH...None. KY...None. IN...None. && SYNOPSIS... NEAR TERM... SHORT TERM... LONG TERM...JGL AVIATION...
Hazardous Weather Outlook National Weather Service Wilmington OH 407 PM EDT Wed Aug 2 2017 INZ050-058-059-066-073>075-080-KYZ089>100-OHZ026-034-035-042>046- 051>056-060>065-070>074-077>082-088-030900- Wayne-Fayette IN-Union IN-Franklin IN-Ripley-Dearborn-Ohio- Switzerland-Carroll-Gallatin-Boone-Kenton-Campbell-Owen-Grant- Pendleton-Bracken-Robertson-Mason-Lewis-Hardin-Mercer-Auglaize-Darke- Shelby-Logan-Union OH-Delaware-Miami-Champaign-Clark-Madison- Franklin OH-Licking-Preble-Montgomery-Greene-Fayette OH-Pickaway- Fairfield-Butler-Warren-Clinton-Ross-Hocking-Hamilton-Clermont-Brown- Highland-Adams-Pike-Scioto- 407 PM EDT Wed Aug 2 2017 This Hazardous Weather Outlook is for East Central Indiana, Southeast Indiana, Northeast Kentucky, Northern Kentucky, Central Ohio, Southwest Ohio and West Central Ohio. .DAY ONE...Tonight. There is a low probability for widespread hazardous weather. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday. A strong cold front will cross the region Friday. Thunderstorms along and ahead of the front may become severe with damaging winds and large hail possible. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected at this time.
Special Weather Statement
National Weather Service Wilmington OH
330 PM EDT WED AUG 2 2017
KYZ100-OHZ081-088-022015-
Lewis KY-Scioto OH-Adams OH-
330 PM EDT WED AUG 2 2017
...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN LEWIS...
SOUTHEASTERN ADAMS AND SOUTHWESTERN SCIOTO COUNTIES UNTIL 415 PM
EDT...
At 329 PM EDT, radar indicated a strong thunderstorm near Vanceburg,
moving northeast at 20 mph.
STORM HAZARDS INCLUDE...
Winds to 50 mph...
One half inch diameter hail...
Very heavy rain...
Locations impacted include...
Vanceburg, Camp Dix, Friendship, Sandy Springs, Garrison, Buena Vista
in Scioto County, Saint Paul, Firebrick, Rexton, Kinniconick, Tannery
and Turkey Creek Lake.
Water will pond on roads and may quickly fill roadside ditches and
small streams.
To report hazardous weather conditions, go to our website at
weather.gov/iln and submit your report via social media, when you can
do so safely.
LAT...LON 3856 8344 3885 8320 3870 8304 3868 8303
3866 8305 3864 8305 3863 8307 3861 8308
3860 8307 3857 8310 3855 8310 3853 8312
3853 8315 3850 8317 3849 8319 3848 8319
3843 8328
TIME...MOT...LOC 1929Z 228DEG 19KT 3855 8329
NovakSpecial Weather Statement National Weather Service Wilmington OH 452 PM EDT WED AUG 2 2017 OHZ073-080-082-022115- Pike OH-Highland OH-Ross OH- 452 PM EDT WED AUG 2 2017 ...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN PIKE...EASTERN HIGHLAND AND SOUTHWESTERN ROSS COUNTIES UNTIL 515 PM EDT... At 452 PM EDT, radar indicated a strong thunderstorm over Rocky Fork Point. This storm was nearly stationary. STORM HAZARDS INCLUDE... Winds to 40 mph... Very heavy rain... Locations impacted include... Hillsboro, Greenfield, Marshall, Rocky Fork Point, Highland Holiday, Cynthiana, Rocky Fork Lake, Rainsboro, Berrysville, Highland County Airport and Paint Creek State Park. Water will pond on roads and may quickly fill roadside ditches and small streams. To report hazardous weather conditions, go to our website at weather.gov/iln and submit your report via social media, when you can do so safely. LAT...LON 3909 8359 3925 8366 3937 8337 3909 8333 TIME...MOT...LOC 2052Z 253DEG 4KT 3919 8354 Novak
Special Weather Statement
National Weather Service Wilmington OH
455 PM EDT WED AUG 2 2017
OHZ073-082-088-022130-
Pike OH-Scioto OH-Ross OH-
455 PM EDT WED AUG 2 2017
...A STRONG THUNDERSTORM WILL AFFECT EASTERN PIKE...NORTH CENTRAL
SCIOTO AND SOUTH CENTRAL ROSS COUNTIES UNTIL 530 PM EDT...
At 455 PM EDT, radar indicated a strong thunderstorm near Lucasville,
moving northeast at 20 mph.
STORM HAZARDS INCLUDE...
Winds to 40 mph...
Pea size hail...
Locations impacted include...
Waverly, Piketon, Beaver, Givens, Wakefield, Pike County Airport,
Linn, Lake White, Scioto Trail State Park, Omega, Germany and
Stockdale.
To report hazardous weather conditions, go to our website at
weather.gov/iln and submit your report via social media, when you can
do so safely.
LAT...LON 3899 8280 3889 8298 3902 8313 3927 8294
3915 8279
TIME...MOT...LOC 2055Z 225DEG 18KT 3897 8300
NovakSpecial Weather Statement National Weather Service Wilmington OH 501 PM EDT WED AUG 2 2017 OHZ073-080-082-022145- Pike OH-Highland OH-Ross OH- 501 PM EDT WED AUG 2 2017 ...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN PIKE...EAST CENTRAL HIGHLAND AND SOUTHWESTERN ROSS COUNTIES UNTIL 545 PM EDT... At 501 PM EDT, radar indicated a strong thunderstorm over Cynthiana, moving east at 5 mph. STORM HAZARDS INCLUDE... Winds to 40 mph... Pea size hail... Very heavy rain... Locations impacted include... Bainbridge, Pike Lake, Cynthiana, Kincaid Springs, Summithill, Bourneville, Knockemstiff and Buchanan. Water will pond on roads and may quickly fill roadside ditches and small streams. To report hazardous weather conditions, go to our website at weather.gov/iln and submit your report via social media, when you can do so safely. LAT...LON 3909 8339 3928 8336 3936 8306 3910 8309 TIME...MOT...LOC 2101Z 269DEG 7KT 3919 8330 Novak
Special Weather Statement
National Weather Service Wilmington OH
521 PM EDT WED AUG 2 2017
OHZ046-055-056-022200-
Licking OH-Delaware OH-Franklin OH-
521 PM EDT WED AUG 2 2017
...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN FRANKLIN...
SOUTHEASTERN DELAWARE AND SOUTHWESTERN LICKING COUNTIES UNTIL 600 PM
EDT...
At 521 PM EDT, radar indicated a strong thunderstorm near
Westerville, moving southeast at 20 mph.
STORM HAZARDS INCLUDE...
Winds to 40 mph...
Pea size hail...
Locations impacted include...
Columbus, Newark, Westerville, Reynoldsburg, Gahanna, Granville,
Pataskala, Johnstown, Beechwood Trails, Granville South, Summit
Station, Etna, New Albany, Jersey, Alexandria, State Route 310 at
State Route 161 and Center Village.
This includes I-70 in Ohio between mile markers 117 and 119.
To report hazardous weather conditions, go to our website at
weather.gov/iln and submit your report via social media, when you can
do so safely.
LAT...LON 4006 8246 3993 8269 3994 8271 4014 8296
4026 8279
TIME...MOT...LOC 2121Z 316DEG 18KT 4015 8282
NovakSpecial Weather Statement National Weather Service Wilmington OH 554 PM EDT WED AUG 2 2017 OHZ046-055-056-065-022245- Licking OH-Fairfield OH-Delaware OH-Franklin OH- 554 PM EDT WED AUG 2 2017 ...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN FRANKLIN...NORTH CENTRAL FAIRFIELD...SOUTHEASTERN DELAWARE AND SOUTHWESTERN LICKING COUNTIES UNTIL 645 PM EDT... At 554 PM EDT, radar indicated a strong thunderstorm near Summit Station, moving southeast at 10 mph. STORM HAZARDS INCLUDE... Winds to 40 mph... Very heavy rain... Locations impacted include... Columbus, Newark, Westerville, Reynoldsburg, Gahanna, Heath, Granville, Pataskala, Johnstown, Beechwood Trails, Granville South, Summit Station, Etna, New Albany, Jersey, Kirkersville, Alexandria, State Route 310 at State Route 161 and Huber Ridge. This includes I-70 in Ohio between mile markers 115 and 123. Water will pond on roads and may quickly fill roadside ditches and small streams. To report hazardous weather conditions, go to our website at weather.gov/iln and submit your report via social media, when you can do so safely. LAT...LON 4008 8292 4019 8273 4002 8243 3989 8268 TIME...MOT...LOC 2154Z 314DEG 9KT 4008 8275 Novak
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Water was reported on State Route 605, north of Dublin-Granville Rd.
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, August 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: 705021.