Flash Flood Warning 74, NWS Wilmington, OH

Area Forecast Discussion
National Weather Service Wilmington OH
313 PM EDT Wed Aug 19 2026

.WHAT HAS CHANGED...
Flood Watch issued for counties near and north of I-70 corridor for
this afternoon into Thursday morning.

&&

.KEY MESSAGES...
1) Showers and thunderstorms will develop into the area later this
afternoon and continue through tonight as low pressure and a cold
front move across the area. Locally heavy rain is possible.

2) Additional storms are expected on Saturday with another cold
front sweeping through.

&&

.DISCUSSION...
KEY MESSAGE 1)

Scattered showers moving into the western portions of our CWA during
the mid afternoon. Limited instability and poor wind shear resulting
in minimal convection, but cannot rule out stray lightning strikes
from this afternoon activity, especially as CAPE values gradually
increase from the west.

Late this evening, a cold front will begin to carve its way south,
slowly progressing through our CWA tonight through early Thursday. A
more robust shortwave trough will accompany this frontal boundary
overnight, which will increase the amount of forcing and overall
convective activity. For several runs now, CAMs have been hinting at
an east-west oriented line of showers/storms developing near the
I-70 corridor late this evening and continuing into the overnight
hours. For some locations, a 4-6 hour period of moderate to heavy
rainfall may ensue. The environment suggests PWATs around 1.6-1.8"
and warm rain processes that will be conducive to heavy rainfall.
Combined with the fact that locations near eastern IN/western OH and
central OH have saturated soils in the 95th-99th percentile range
(according to NASA SPoRT-LIS), a Flood Watch has been issued given
the flash flood risk.

Keep in mind, heavy rainfall may still be possible outside of the
Flood Watch area. While most CAMs have been more progressive with the
heavy rain in our south, portions of the Tristate (esp far southwest
OH) are also particularly vulnerable due to high soil moisture
content. Should storms be more robust and linger a bit longer in near
the Ohio River, localized hydro issues may occur.

Severe potential appears to be very limited today/tonight. It will be
difficult to develop large hail with any storms this
afternoon/evening. Wind shear doesn't increase until later this
evening, so we could see some stronger gusts overnight, but overall
this threat is expected to remain low.

KEY MESSAGE 2)

Shower/storm potential remains for Saturday afternoon and evening
based on latest model guidance. Some deterministic models have been
less robust in overall coverage of pcpn, with the best chances for
storms shifting northwards towards central/western OH and areas
north. Nonetheless, still warrants a mention given that another cold
front will sweep through the Ohio Valley and modest instability is
expected to be in place. Will delve into more details as we get
closer.

&&

.AVIATION /18Z WEDNESDAY THROUGH MONDAY/...
A round of showers with embedded thunder is possible this afternoon
and early evening. Just had a SHRA mention for this afternoon given
limited thunder activity, but will amend if coverage in thunder
increases.

Better coverage in showers and particularly thunderstorms is expected
late this evening, primarily after 00z. Timing is still a little
uncertain on when the heaviest rainfall is expected (some guidance is
beginning to trend storms even later). Nonetheless, the moral of the
story is that a west-east oriented band of pcpn is expected to
develop and provide multiple rounds of storms near the I-70 corridor
with a slow moving cold front. Additional showers/storms will begin
to fire off a few hours later near the Tristate, with pcpn becoming
more progressive early Thursday morning before pushing eastward.

MVFR CIGs (< 2000 ft) expected to develop early Thursday morning,
perhaps before the rainfall ends. A period of IFR cannot be ruled
out, but not confident enough yet to include in the TAFs. CIGs
expected to improve back to VFR by Thursday afternoon.

Other than brief gusts within thunderstorms, winds generally remain
light below 10 kts through the taf period, with a shift to the NW
Thursday morning behind the frontal passage.

OUTLOOK...Thunderstorms possible Saturday afternoon and evening.

&&

.ILN WATCHES/WARNINGS/ADVISORIES...
OH...Flood Watch through Thursday morning for OHZ026-034-035-042>046-
     051>056-060>065-074.
KY...None.
IN...Flood Watch through Thursday morning for INZ050-058-059.

&&

DISCUSSION...Clark
AVIATION...Clark

Hazardous Weather Outlook
National Weather Service Wilmington OH
317 PM EDT Wed Aug 19 2026

INZ050-058-059-OHZ026-034-035-042>046-051>056-060>065-074-201930-
Wayne-Fayette-Union-Hardin-Mercer-Auglaize-Darke-Shelby-Logan-
Delaware-Miami-Champaign-Clark-Madison-Franklin-Licking-Preble-
Montgomery-Greene-Pickaway-Fairfield-Hocking-
317 PM EDT Wed Aug 19 2026

...FLOOD WATCH IN EFFECT THROUGH THURSDAY MORNING...

This Hazardous Weather Outlook is for east central Indiana, central
Ohio and west central Ohio.

.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.

   Flood Watch.

Some storms this evening and tonight may produce strong wind gusts.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

Please listen to NOAA Weather Radio or go to weather.gov on the
Internet for more information about the following hazards.

   Flood Watch.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

INZ066-073>075-080-KYZ089>100-OHZ070>073-077>082-088-201930-
Franklin-Ripley-Dearborn-Ohio-Switzerland-Carroll-Gallatin-Boone-
Kenton-Campbell-Owen-Grant-Pendleton-Bracken-Robertson-Mason-Lewis-
Butler-Warren-Clinton-Ross-Hamilton-Clermont-Brown-Highland-Adams-
Pike-Scioto-
317 PM EDT Wed Aug 19 2026

This Hazardous Weather Outlook is for southeast Indiana, northeast
Kentucky, northern Kentucky, south central Ohio and southwest Ohio.

.DAY ONE...This afternoon and tonight.

Showers and thunderstorms tonight may produce locally heavy rain that
could lead to isolated flooding. Some storms this evening and
tonight may also produce strong wind gusts.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

There is a low probability for widespread hazardous weather.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

Special Weather Statement
National Weather Service Wilmington OH
330 PM EDT Wed Aug 19 2026

OHZ026-034-035-042>046-051>056-192200-
Hardin-Mercer-Auglaize-Darke-Shelby-Logan-Union-Delaware-Miami-
Champaign-Clark-Madison-Franklin-Licking-
Including the cities of Kenton, Ada, Celina, Coldwater,
Wapakoneta, St. Marys, New Bremen, Minster, Greenville, Sidney,
Bellefontaine, Marysville, Delaware, Troy, Piqua, Tipp City,
Urbana, Springfield, London, West Jefferson, Plain City,
Downtown Columbus, and Newark
330 PM EDT Wed Aug 19 2026

...COLD AIR FUNNELS THIS AFTERNOON/EVENING...

Showers and thunderstorms will be capable of producing brief cold
air funnels this afternoon and evening. Several funnel clouds
have already been spotted across west-central Ohio, with this
feature potentially moving into central Ohio over the coming
hours. Keep in mind, the majority of these funnels will not reach
the ground, but if they do, gusty winds and minor damage may
occur.

Preliminary Local Storm Report
National Weather Service Wilmington OH
407 PM EDT Wed Aug 19 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0416 PM     Tornado          4 WNW Winchester        38.96N 83.73W
08/11/2026                   Brown              OH   NWS Storm Survey

            EF1 tornado with maximum estimated winds of
            100 mph southwest of Winchester. Path length
            7.1 miles. Path width 350 yards.

&&

MSZ/JCG

Special Weather Statement
National Weather Service Wilmington OH
426 PM EDT Wed Aug 19 2026

OHZ043-044-192100-
Logan OH-Shelby OH-
426 PM EDT Wed Aug 19 2026

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF CENTRAL SHELBY AND
SOUTHWESTERN LOGAN COUNTIES THROUGH 500 PM EDT...

At 426 PM EDT, strong thunderstorms were located along a line
extending from Fort Loramie to De Graff, moving east at 20 mph.

HAZARD...Wind gusts up to 40 mph and very heavy rain.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Visibility will be poor and hydroplaning
         is possible.

Locations impacted include...
Sidney, Bellefontaine, Newport, West Liberty, Anna, Fort Loramie, De
Graff, Hardin, Quincy, Port Jefferson, Logansville, Lake Loramie
State Park, Mcmorran, Maplewood, Mccartyville, Swanders, Bloom
Center, Pemberton, and Lewistown.

This includes I-75 in Ohio between mile markers 91 and 101.

If outdoors, consider seeking shelter inside a sturdy building.

Motorists should slow down and use extra caution.

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 4044 8373 4026 8367 4027 8401 4026 8402
      4026 8441 4038 8443 4038 8434 4041 8434
TIME...MOT...LOC 2026Z 284DEG 16KT 4035 8440 4039 8393

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

Hatzos

Special Weather Statement
National Weather Service Wilmington OH
455 PM EDT Wed Aug 19 2026

OHZ043-044-052-192130-
Champaign OH-Logan OH-Shelby OH-
455 PM EDT Wed Aug 19 2026

...STRONG THUNDERSTORMS WILL IMPACT PORTIONS OF SOUTHEASTERN
SHELBY...NORTHERN CHAMPAIGN AND SOUTHERN LOGAN COUNTIES THROUGH 530
PM EDT...

At 455 PM EDT, strong thunderstorms were located along a line
extending from near Sidney to near Bellefontaine, moving east at 25
mph.

HAZARD...Wind gusts up to 40 mph, pea size hail, and very heavy
         rain.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Hail may cause minor damage to
         vegetation. Visibility will be poor and hydroplaning is
         possible.

Locations impacted include...
Sidney, Bellefontaine, West Liberty, North Lewisburg, De Graff,
Quincy, Port Jefferson, Valley Hi, Zanesfield, Logansville, Rosewood,
Pickrelltown, Middleburg, Plattsville, Maplewood, Springhills, Mingo,
Pemberton, and East Liberty.

This includes I-75 in Ohio between mile markers 95 and 99.

If outdoors, consider seeking shelter inside a sturdy building.

Motorists should slow down and use extra caution.

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 4037 8379 4037 8354 4024 8355 4023 8355
      4023 8354 4020 8354 4022 8416 4039 8417
TIME...MOT...LOC 2055Z 281DEG 21KT 4032 8418 4036 8380

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

Hatzos

Special Weather Statement
National Weather Service Wilmington OH
531 PM EDT Wed Aug 19 2026

OHZ044-045-052-192200-
Champaign OH-Logan OH-Union OH-
531 PM EDT Wed Aug 19 2026

...A STRONG THUNDERSTORM WILL IMPACT PORTIONS OF NORTHEASTERN
CHAMPAIGN...SOUTHEASTERN LOGAN COUNTIES IN WEST CENTRAL OHIO AND
SOUTHERN UNION COUNTIES IN CENTRAL OHIO THROUGH 600 PM EDT...

At 531 PM EDT, a strong thunderstorm was located near North
Lewisburg, moving east at 25 mph.

HAZARD...Wind gusts up to 40 mph, pea size hail, and very heavy
         rain.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Hail may cause minor damage to
         vegetation. Visibility will be poor and hydroplaning is
         possible.

Locations impacted include...
Marysville, North Lewisburg, Milford Center, Woodstock, Unionville
Center, Raymond, Pickrelltown, Broadway, Middleburg, Pharisburg,
Pottersburg, Mingo, New Dover, and East Liberty.

If outdoors, consider seeking shelter inside a sturdy building.

Motorists should slow down and use extra caution.

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 4020 8369 4038 8364 4035 8329 4024 8325
      4012 8332
TIME...MOT...LOC 2131Z 283DEG 23KT 4028 8358

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

Hatzos

Preliminary Local Storm Report
National Weather Service Wilmington OH
534 PM EDT Wed Aug 19 2026

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0532 PM     Flood            Bellefontaine           40.36N 83.76W
08/19/2026                   Logan              OH   911 Call Center

            Bellefontaine law enforcement responding to
            vehicles stuck in high water.

&&

nm