Severe Thunderstorm Warning 343, NWS Indianapolis, IN

Area Forecast Discussion
National Weather Service Indianapolis IN
216 PM EDT Wed Aug 26 2026

.KEY MESSAGES...

- Scattered showers and storms, some severe, possible this evening.

- Dry weather returns for late week into the weekend.

- Hotter and more humid air arrives Sunday into early next week.

&&

.DISCUSSION (This evening through Wednesday)...
Issued at 216 PM EDT Wed Aug 26 2026

Rest of This Afternoon and Tonight...

Weak lift well ahead of the surface cold front produced isolated
showers across the northern forecast area earlier. These have since
exited, but the lift continues to produce some clouds across
the area. Can't rule out another isolated shower developing through
mid-afternoon with this lift.

A line of showers and storms has developed in central Illinois this
afternoon. This line is ahead of the surface cold front, which is
farther to the northwest in Illinois. Instability continues to
increase ahead of this line, with MLCAPE over 1500 J/kg. With some
heating and moisture advection to go before the line arrives in
central Indiana, the storms should become more numerous and
intensify.

The line will move through the area from northwest to southeast late
this afternoon through this evening. Decent shear will work with the
aforementioned instability to keep a threat of some severe storms
around. The primary threats will be damaging winds and large hail.
However, isolated tornadoes cannot be ruled out, especially north
where shear is best.

After midnight, only the southeast third or so will still see some
scattered convection around. Instability will have waned by then,
ending the severe threat. By 3 or 4 AM, convection should have
exited the area.

Drier air will lag well behind the front, and winds will diminish
overnight. This will set up the potential for some fog, especially
south where rain will have fallen last.

Lows will generally be in the 60s.

Thursday...

The upper trough will linger across the area on Thursday. Low level
moisture will remain. Any fog will lift early in the day, with a
scattered to broken cumulus field developing. Some CAMs generate
isolated convection Thursday afternoon with some weak forcing from
the upper trough. This certainly cannot be ruled out, but for now
feel odds are below mentioning in the forecast at this time.

Highs will be in the lower and middle 80s.

Friday through Monday...

An upper high will nudge its way into the area during this period.
This will keep the area dry with increasingly warmer temperatures.

Initially dewpoints will be relatively low, but they will increase
Sunday into Monday, making conditions more humid to go along with
the elevated temperatures.

Highs in the lower to middle 80s on Friday will warm to the middle
80s to lower 90s by Sunday. On Monday, highs could reach the upper
80s to middle 90s. Heat indices may be near 100 degrees on Monday.

Tuesday and beyond...

Uncertainty increases in how much influence the upper high will
continue to have across the area. For now, believe it will hang on,
so will go dry the vast majority of the area on Tuesday. By
Wednesday, it may lose enough influence for isolated convection to
develop in the afternoon.

Heat will continue, with highs most likely from near 90 to the
middle 90s. Heat indices near 100 would also then be likely.

&&

.AVIATION (18Z TAF Issuance)...
Issued at 1259 PM EDT Wed Aug 26 2026

Impacts:

- Scattered convection mainly 21-04Z
- Areas of MVFR fog overnight, with worse conditions possible

Discussion:

Scattered to broken clouds around 5000FT will continue this
afternoon. Scattered convection will develop later this afternoon
and move south across the sites through the evening.

Overnight, fog and some stratus is likely to develop, especially
across the southern sites. Will go MVFR, but IFR and worse are
possible. This fog will mix out to a scattered to broken cumulus
field for Thursday.

Winds will become west this evening then northwest on Thursday.

&&

.IND WATCHES/WARNINGS/ADVISORIES...
None.
&&

AVIATION...50
DISCUSSION...50

Hazardous Weather Outlook
National Weather Service Indianapolis IN
305 PM EDT Wed Aug 26 2026

INZ021-028>031-035>049-051>057-060>065-067>072-271915-
Carroll-Warren-Tippecanoe-Clinton-Howard-Fountain-Montgomery-Boone-
Tipton-Hamilton-Madison-Delaware-Randolph-Vermillion-Parke-Putnam-
Hendricks-Marion-Hancock-Henry-Vigo-Clay-Owen-Morgan-Johnson-Shelby-
Rush-Sullivan-Greene-Monroe-Brown-Bartholomew-Decatur-Knox-Daviess-
Martin-Lawrence-Jackson-Jennings-
305 PM EDT Wed Aug 26 2026

This hazardous weather outlook is for central Indiana.

.DAY ONE...Through Tonight.

Scattered thunderstorms will move northwest to southeast across
central Indiana into the early overnight. Some severe storms are
possible through this evening. Damaging winds and large hail are the
primary threats. Locally heavy rain is also possible.

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

Hot and humid conditions will return early next week.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report any large hail, wind damage, or
heavy rain through this evening.

&&

More information, along with other weather, hydrological and climate
information can be found at http://weather.gov/ind

Special Weather Statement
National Weather Service Indianapolis IN
736 PM EDT Wed Aug 26 2026

INZ045-052>055-062-063-270015-
Johnson IN-Clay IN-Brown IN-Owen IN-Morgan IN-Putnam IN-Monroe IN-
736 PM EDT Wed Aug 26 2026

...Strong thunderstorms will impact portions of northern Monroe,
Morgan, northwestern Brown, southwestern Johnson, east central Clay,
Owen and southern Putnam Counties through 815 PM EDT...

At 736 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from 8 miles northwest of Martinsville to 11 miles
west of Spencer. Movement was southeast at 30 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...
Martinsville, Spencer, Ellettsville, Trafalgar, Morgantown, Gosport,
Paragon, Stinesville, Mahalasville, Quincy, McCormicks Creek State
Park, Patricksburg, Eminence, and Devore.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3954 8660 3948 8616 3943 8603 3916 8668
      3917 8675 3933 8713
TIME...MOT...LOC 2336Z 292DEG 24KT 3952 8653 3934 8698

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

ME

Special Weather Statement
National Weather Service Indianapolis IN
808 PM EDT Wed Aug 26 2026

INZ054>056-063-064-270100-
Johnson IN-Brown IN-Morgan IN-Bartholomew IN-Shelby IN-
808 PM EDT Wed Aug 26 2026

...Strong thunderstorms will impact portions of southwestern Shelby,
southeastern Morgan, northeastern Brown, Johnson and northwestern
Bartholomew Counties through 900 PM EDT...

At 808 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Franklin to 11 miles north of Nashville.
Movement was southeast at 25 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...
Columbus, Shelbyville, Franklin, Edinburgh, Whiteland, Bargersville,
Flat Rock, Princes Lakes, Trafalgar, Morgantown, Clifford, Peoga,
Marietta, Spearsville, and Taylorsville.

This includes Interstate 65 between mile markers 69 and 93.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3950 8575 3918 8589 3936 8629 3955 8618
TIME...MOT...LOC 0008Z 292DEG 22KT 3948 8614 3936 8619

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

ME

Special Weather Statement
National Weather Service Indianapolis IN
812 PM EDT Wed Aug 26 2026

INZ053-054-061>064-071-270115-
Brown IN-Owen IN-Morgan IN-Bartholomew IN-Greene IN-Jackson IN-
Monroe IN-
812 PM EDT Wed Aug 26 2026

...Strong thunderstorms will impact portions of Monroe, southeastern
Morgan, Brown, west central Bartholomew, southeastern Owen,
northeastern Greene and northwestern Jackson Counties through 915 PM
EDT...

At 811 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from 9 miles northwest of Nashville to near
Bloomington to near Spencer. Movement was south at 25 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...
Bloomington, Columbus, Spencer, Nashville, Ellettsville, Morgantown,
Stinesville, Smithville, Lake Lemon, Beanblossom, Gnaw Bone, Freedom,
Spurgeons Corner, Monroe Reservoir, Woodville Hills, Elkinsville,
Charles Deam Wilderness, Stone Head, Story, and Unionville.

This includes Interstate 65 between mile markers 65 and 69.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

&&

LAT...LON 3900 8692 3931 8693 3934 8658 3942 8636
      3937 8625 3934 8625 3934 8620 3918 8588
      3904 8620 3899 8641
TIME...MOT...LOC 0011Z 337DEG 20KT 3929 8636 3923 8657 3925 8680

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

ME

Special Weather Statement
National Weather Service Indianapolis IN
843 PM EDT Wed Aug 26 2026

INZ042-270115-
Randolph IN-
843 PM EDT Wed Aug 26 2026

...Strong thunderstorms will impact portions of southeastern Randolph
County through 915 PM EDT...

At 843 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from Union City to 7 miles southwest of Winchester.
Movement was east at 30 mph.

HAZARD...Winds in excess of 40 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...
Union City and Lynn.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 4000 8517 4027 8481 4001 8481
TIME...MOT...LOC 0043Z 270DEG 26KT 4022 8480 4008 8504

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

ME

Preliminary Local Storm Report
National Weather Service Indianapolis IN
854 PM EDT Wed Aug 26 2026

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

0851 PM     Flood            1 W Indiana University  39.17N 86.55W
08/26/2026                   Monroe             IN   Public

            Minor flooding being reported around the
            city of Bloomington.

&&

Crosbie

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