Severe Thunderstorm Warning 151, NWS Northern Indiana

963 
WWUS53 KIWX 182014
SVSIWX

Severe Weather Statement
National Weather Service Northern Indiana
414 PM EDT Mon May 18 2026

OHC039-171-182024-
/O.CAN.KIWX.SV.W.0151.000000T0000Z-260518T2100Z/
Defiance OH-Williams OH-
414 PM EDT Mon May 18 2026

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN DEFIANCE AND
EASTERN WILLIAMS COUNTIES IS CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 600 PM EDT for
southeastern Michigan...and northwestern Ohio.

&&

LAT...LON 4142 8389 4137 8423 4143 8423 4143 8428
      4171 8439 4201 8437 4171 8436 4171 8432
      4172 8388
TIME...MOT...LOC 2014Z 249DEG 37KT 4210 8426 4178 8422 4125 8439 

$$

MIC059-OHC051-069-182100-
/O.CON.KIWX.SV.W.0151.000000T0000Z-260518T2100Z/
Hillsdale MI-Henry OH-Fulton OH-
414 PM EDT Mon May 18 2026

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR SOUTHEASTERN HILLSDALE...NORTHERN HENRY AND FULTON COUNTIES...

At 414 PM EDT, severe thunderstorms were located along a line
extending from Brooklyn to near Morenci to Defiance, moving east at
45 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Napoleon, Wauseon, Archbold, Swanton, Morenci, Delta, Fayette,
Liberty Center, Metamora, Lyons, Texas, Oakshade, Seward, Ridgeville
Corners, Denson, Gerald, Assumption, Colton, Tedrow, and Ottokee.

This includes Interstate 80 in Ohio between mile markers 25 and 48.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4142 8389 4137 8423 4143 8423 4143 8428
      4171 8439 4201 8437 4171 8436 4171 8432
      4172 8388
TIME...MOT...LOC 2014Z 249DEG 37KT 4210 8426 4178 8422 4125 8439 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

DN

573 
WWUS53 KIWX 182018
SVSIWX

Severe Weather Statement
National Weather Service Northern Indiana
418 PM EDT Mon May 18 2026

MIC059-OHC051-069-182028-
/O.CAN.KIWX.SV.W.0151.000000T0000Z-260518T2100Z/
Hillsdale MI-Henry OH-Fulton OH-
418 PM EDT Mon May 18 2026

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HILLSDALE...
NORTHERN HENRY AND FULTON COUNTIES IS CANCELLED...

The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning has been cancelled.  However, gusty winds are
still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 600 PM EDT for
southeastern Michigan...and northwestern Ohio.

&&

LAT...LON 4142 8389 4137 8423 4143 8423 4143 8428
      4171 8439 4201 8437 4171 8436 4171 8432
      4172 8388
TIME...MOT...LOC 2016Z 249DEG 37KT 4211 8423 4179 8419 4126 8436 

$$

DN

Area Forecast Discussion
National Weather Service Northern Indiana
1154 AM EDT Mon May 18 2026

.KEY MESSAGES...

- Severe storms are likely today between 12 PM to around 6 PM
  EDT. Damaging wind gusts to 60 mph and heavy rain are the main
  threats. Low but non-zero risk for large hail and an isolated
  tornado.

- Severe storms are anticipated again Tuesday afternoon and
  evening, with all hazards possible.

- Warm and humid through Tuesday with highs in the mid to upper 80s.

- Cooler with seasonable temperatures and dry midweek. Highs
  only in the 60s Wednesday and Thursday.

&&

.DISCUSSION...
Issued at 1014 AM EDT Mon May 18 2026

Main focus this forecast period is on the severe potential for
today and on Tuesday. For today, seems the one limiting factor
for today's storms will be the available shear, with values of
Bulk Shear is around 20 to 30 kts, this should keep
organization of storms minimal and current convective allowing
guidance and thinking points to a more linear feature moving
northeastward into the area over the next couple of hours from
central IL. A plume of dew points in the mid 60s is pushing
northeastward ahead of the convection currently pushing across
central IL. Surface based CAPE values will run about 2000 to
2500 J/kg over the CWA. With environmental profiles drier near
the surface and a moist plume maxing out around 850 mb this
creates an inverted-V sounding which is indicative of gusty
outflows/winds with thunderstorms this is further illustrated
with Downdraft CAPE values around 1000 J/kg. Storm relative
helicity values look to remain below the 100 m2/s2 threshold but
there is the possibility for an isolated tornado or two. This
first batch of storms will move through after Noon EDT and push
through the area into this evening til around the 8 PM EDT
timeframe. Moderate to heavy rainfall will accompany these
storms with precipitable water value sitting around 1.70 inches.
Of course, the storm motion speed will be important as if the
line moves through quicker that will limit the rainfall amounts
but either way looks like we should get a pretty good slug of
rain with today's event as trailing stratiform will bring some
moderate steady rainfall behind the initial line of
thunderstorms as it pushes eastward through the area. Storm
totals over the next two days looks to see some areas seeing
close to an inch of new rainfall.

A break in the action takes place tonight into the overnight
period before the better looking set up arrives tomorrow in the
form of a cold front associated with a low pressure circulation
centered over northern WI. SB CAPE values will be around
1500-2500 J/kg, surface dew points will get into the upper 60s
with a few locations seeing lower 70s, bulk shear values 30-40
kts, and mid level lapse rates around 6 deg/km and helicity
values of 100-200 m2/s2. At this time it looks as if all
threats will be on the table with the better helicity and shear
values associated with the close proximity of the frontal
boundary that will push eastward through the area. The exact
timing is still a bit hazy but current indications have the
frontal boundary approaching the western portions of our CWA
around 1 PM EDT and exiting the area by early morning Wednesday.
SPC currently has our entire area in a slight risk for severe
thunderstorms for Tuesday. Heavy to moderate rainfall will once
again be possible with the thunderstorms and as stated earlier
that around 1 inch of new rainfall will be possible with these
two batches of storms and locally heavier amounts if the
residence times of thunderstorms linger.

In the wake of the cold front a more zonal flow develops over
the region on Wednesday and cooler and drier conditions will
arrive. Highs on Wednesday will only get into the 60s which is
about a 20 degree drop from the 80s today and Tuesday. Upper
level ridging begins to push into the region by Thursday and
will start to see a gradual increase in temperatures into the
weekend. Highs Friday and Saturday will be in the 70s. Sunday
into the beginning of next week highs will return int 80s.
Chances for afternoon showers and thunderstorms will also
increase over the weekend and at this time the best chances will
be Friday afternoon and evening with a trough pushing through
the area but periods of showers/t-storms will be possible each
day into next week.

&&

.AVIATION /18Z TAFS THROUGH 18Z TUESDAY/...
Issued at 1149 AM EDT Mon May 18 2026

Primarily weather concern is an incoming squall line from the
west. Observation stations have had episodes of G30KT, with at
least one unofficial report of 58mph gust toward central IL.
Timing was adjusted to TSRA to align with the latest storm
motion. Behind this line, dry for the overnight hours unless
stratiform rain back builds over KFWA (low confidence, but will
monitor). Additional TSRA Tuesday, especially at KFWA, but just
beyond this TAF period.

&&

.IWX WATCHES/WARNINGS/ADVISORIES...
IN...None.
OH...None.
MI...None.
MARINE...None.

&&

DISCUSSION...Andersen
AVIATION...Brown

Preliminary Local Storm Report
National Weather Service Northern Indiana
324 PM EDT Mon May 18 2026

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

0247 PM     Tstm Wnd Dmg     2 NNE Coesse            41.16N 85.38W
05/18/2026                   Whitley            IN   Emergency Mngr

            Emergency Manager report of tree blown down
            across Ruckman Road near Old Trail Road
            about 6 miles east of Columbia City in
            Whitley County in Indiana. Time estimated by
            radar.

&&

JA

Preliminary Local Storm Report
National Weather Service Northern Indiana
327 PM EDT Mon May 18 2026

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

0312 PM     Tstm Wnd Gst     Kinderhook              41.80N 85.00W
05/18/2026  M57 MPH          Branch             MI   Mesonet

&&

NDM

Preliminary Local Storm Report
National Weather Service Northern Indiana
334 PM EDT Mon May 18 2026

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

0200 PM     Tstm Wnd Dmg     Vandalia                41.92N 85.91W
05/18/2026                   Cass               MI   Public

            Large trees downed in Vandalia area. Time
            estimated from radar.

&&

NDM

Special Weather Statement
National Weather Service Northern Indiana
343 PM EDT Mon May 18 2026

OHZ002-182000-
Fulton OH-
343 PM EDT Mon May 18 2026

...A STRONG THUNDERSTORM WILL IMPACT EASTERN FULTON COUNTY THROUGH
400 PM EDT...

At 343 PM EDT, Doppler radar was tracking a strong thunderstorm near
Delta, or near Wauseon, moving northeast at 45 mph.

HAZARD...Wind gusts up to 50 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor hail damage to vegetation is
         possible.

Locations impacted include...
Swanton, Delta, Metamora, Lyons, Oakshade, Seward, Denson, Winameg,
Ottokee, and Assumption.

This includes Interstate 80 in Ohio between mile markers 35 and 48.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

A Severe Thunderstorm Watch remains in effect until 600 PM EDT for
northwestern Ohio.

&&

LAT...LON 4160 8388 4153 8408 4167 8423 4171 8415
      4172 8388
TIME...MOT...LOC 1943Z 233DEG 38KT 4162 8405

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...50 MPH

DN

Preliminary Local Storm Report
National Weather Service Northern Indiana
347 PM EDT Mon May 18 2026

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

0204 PM     Tstm Wnd Dmg     Jones                   41.91N 85.80W
05/18/2026                   Cass               MI   Public

            Reports of trees downed. Time estimated from
            radar.

&&

NDM

Special Weather Statement
National Weather Service Northern Indiana
354 PM EDT Mon May 18 2026

OHZ015-024-182045-
Van Wert OH-Paulding OH-
354 PM EDT Mon May 18 2026

...STRONG THUNDERSTORMS WILL IMPACT PAULDING AND NORTHERN VAN WERT
COUNTIES THROUGH 445 PM EDT...

At 354 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Hicksville to Convoy. Movement was
northeast at 30 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Van Wert, Delphos, Paulding, Antwerp, Payne, Convoy, Middle Point,
Grover Hill, Scott, Melrose, Haviland, Latty, Cecil, Broughton,
Wetzel, Worstville, Arthur, Charloe, Tipton, and Roselms.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 600 PM EDT for
northwestern and west central Ohio.

&&

LAT...LON 4083 8434 4085 8480 4091 8480 4125 8477
      4125 8446 4121 8446 4121 8434 4099 8434
      4099 8440 4090 8440 4090 8434
TIME...MOT...LOC 1954Z 227DEG 25KT 4124 8472 4090 8473

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

Brown