Severe Thunderstorm Warning 155, NWS Northern Indiana

Area Forecast Discussion
National Weather Service Northern Indiana
229 PM EDT Tue May 19 2026

.KEY MESSAGES...

- Strong to severe storms are possible today through 9 PM EDT.

- Damaging wind gusts to 60 mph and heavy rain are the
  main threats. Low but non-zero risk for hail and an isolated
  tornado.

- Warm and humid again today with highs in the mid to upper 80s.

- Cooler and dry midweek with highs only in the 60s Wednesday
  and Thursday.

- Next chance for rain and a few storms arrive Friday.

&&

.DISCUSSION...
Issued at 225 PM EDT Tue May 19 2026

A cold front currently positioned over Wisconsin and Illinois
will swing eastward and through the local forecast area this
evening. Ahead of this front, strong to severe storms will become
possible this afternoon and evening. The region is well into the
warm sector with temperatures in the upper 70s to mid 80s and
dewpoints in the upper 60s to low 70s. The moisture combined
with daytime heating supports SBCAPE of 2000-2500 J/kg,
especially east of the I-69 corridor where cloud cover has been
minimal today. Destabilization is beginning to occur with
cumulus development evident on satellite. The best chances for
strong to severe storms will be 3-9 PM EDT today. The greatest
risk area will be along and south of US-24, where a Slight Risk
(level 2 of 5) for severe weather is in place. Shear is still
expected to be weak given a fairly unidirectional vertical wind
profile, but it will be better than the past few days at 20 to
30 kts. With weaker shear, the favored storm mode will be
multicell clusters or line segments. Given DCAPE over 1000 J/kg
this afternoon and evening and steep low level lapse rates of
7-8 C/km, damaging winds will be the main threat today.
Confidence in isolated tornado chances is decreasing due to
current low level SRH less than 150 m2/s2, and forecast to
decrease today. If one were to develop, the potential is still
greatest in NW Ohio, which will have the longest time to heat up
and destabilize today as the cold front takes its time moving
in from west to east. With PWATs now around 1.5-1.6", even if
storm clusters are not severe, they will likely be efficient
with rainfall rates in excess of 1"/hr.

After the passage of the cold front, the second half of the workweek
will be much cooler with highs only in the 60s through Friday. Rain
showers will likely be continuing southeast of US-24 on Wednesday
morning before drier air moves in. The next chance for rain will
then be on Friday afternoon in association with a shortwave coming
up from the southwest. We could get a bit of a break on Saturday
before a stronger upper trough moves across the region on Sunday.
Unsettled weather will also be possible on Memorial Day, especially
south of US-30, but model agreement is poor so there is low
confidence in forecast specifics.

&&

.AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/...
Issued at 1255 PM EDT Tue May 19 2026

Afternoon destabilization ahead of a cold front is expected to
allow storms to develop rapidly. The satellite picture indicated
a line of convection was developing near the southeast shore of
Lake Michigan. There was a very tight CAPE gradient over Indiana
with values between 2500 to 3000 J/Kg to the east (and values
much lower to the west). All indications are storms will develop
rapidly near and and northwest of SBN, so have included SBN in
thunderstorms at the start of the TAF period. Winds will shift
to the northwest behind the front with the activity moving
southeast of SBN. As for FWA, convection should fill in with the
front, so went for a higher confidence (22-02Z) with chances
for storms after 02Z. Winds should shift to the northwest at
both sites with lingering ceilings VFR or close to 030.

&&

.IWX WATCHES/WARNINGS/ADVISORIES...
IN...None.
OH...None.
MI...None.
MARINE...Small Craft Advisory until 5 PM EDT this afternoon for LMZ043-
     046.

&&

DISCUSSION...Cobb
AVIATION...Skipper

Special Weather Statement
National Weather Service Northern Indiana
400 PM EDT Tue May 19 2026

INZ024-025-032-192030-
Wabash IN-Huntington IN-Grant IN-
400 PM EDT Tue May 19 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN WABASH...NORTHERN
GRANT AND SOUTHWESTERN HUNTINGTON COUNTIES THROUGH 430 PM EDT...

At 359 PM EDT, Doppler radar was tracking a strong thunderstorm over
Sweetser, or near Marion, moving northeast at 35 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...
Marion, Sweetser, Swayzee, La Fontaine, Van Buren, Converse,
Lancaster, Mount Etna, Landess, Lincolnville, Mier, Jalapa, Herbst,
Hanfield, Majenica, Banquo, Roseburg, Lake Wood, Somerset, and
Pleasant Plain.

This includes Interstate 69 in Indiana between mile markers 264 and
277.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 700 PM EDT for
northeastern Indiana.

&&

LAT...LON 4048 8580 4055 8587 4065 8586 4083 8557
      4079 8544 4065 8543 4065 8545 4058 8545
TIME...MOT...LOC 1959Z 235DEG 33KT 4058 8578

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

DN

Special Weather Statement
National Weather Service Northern Indiana
409 PM EDT Tue May 19 2026

INZ018-025-026-192030-
Huntington IN-Wells IN-Allen IN-
409 PM EDT Tue May 19 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHWESTERN ALLEN...
NORTHEASTERN HUNTINGTON AND NORTHEASTERN WELLS COUNTIES THROUGH 430
PM EDT...

At 409 PM EDT, Doppler radar was tracking a strong thunderstorm near
Markle, or 8 miles west of Ossian, moving northeast at 40 mph.

HAZARD...Wind gusts up to 50 mph and half inch 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...
Fort Wayne, Huntington, New Haven, Ossian, Markle, Aboite,
Middletown, Roanoke, Zanesville, Uniondale, Nine Mile, Bowerstown,
Yoder, Poe, Hessen Cassel, Mahon, and Rolling Hills.

This includes the following highways...
 Interstate 469 between mile markers 0 and 15.
 Interstate 69 in Indiana between mile markers 284 and 306.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 700 PM EDT for
northeastern Indiana.

&&

LAT...LON 4089 8551 4101 8535 4100 8534 4102 8533
      4109 8523 4109 8506 4092 8500 4092 8507
      4089 8507 4078 8541
TIME...MOT...LOC 2009Z 235DEG 35KT 4090 8533

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...50 MPH

DN

Special Weather Statement
National Weather Service Northern Indiana
429 PM EDT Tue May 19 2026

INZ018-192100-
Allen IN-
429 PM EDT Tue May 19 2026

...A STRONG THUNDERSTORM WILL IMPACT SOUTHEASTERN ALLEN COUNTY
THROUGH 500 PM EDT...

At 428 PM EDT, Doppler radar was tracking a strong thunderstorm near
New Haven, moving northeast at 45 mph.

HAZARD...Wind gusts of 50 to 55 mph and half inch 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...
Fort Wayne, New Haven, Woodburn, Tillman, Edgerton In Allen County,
Townley, Hessen Cassel, Zulu, and Maples.

This includes Interstate 469 between mile markers 9 and 24.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 700 PM EDT for
northeastern Indiana...and northwestern and west central Ohio.

&&

LAT...LON 4103 8518 4127 8480 4102 8480 4094 8511
TIME...MOT...LOC 2028Z 236DEG 39KT 4103 8508

MAX HAIL SIZE...0.50 IN
MAX WIND GUST...55 MPH

FISHER

Preliminary Local Storm Report
National Weather Service Northern Indiana
447 PM EDT Tue May 19 2026

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

0435 PM     Tstm Wnd Gst     3 NNE Michaelsville     40.49N 85.68W
05/19/2026  M56 MPH          Grant              IN   AWOS

&&

NDM

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