Alert archive / Indiana / Severe Thunderstorm Warnings in 2026

Severe Thunderstorm Warning 338, NWS Indianapolis, IN

August 20, 20264 counties in Indiana

NWS Indianapolis, IN issued this severe thunderstorm warning at Aug 20, 2026, 3:32 AM EDT for 4 counties in Indiana. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 20, 2026, 3:32 AM EDT (07:32 UTC)
Expired: Aug 20, 2026, 4:00 AM EDT
In force: 28 min
Issued by: NWS Indianapolis, IN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Decatur County, IN, Jennings County, IN, Rush County, IN, Shelby County, IN

The radar

The Indianapolis radar (KIND), 70 km from the middle of the area, began a volume at 07:32 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Cncnati-Daytn, OH (KILN), launched 00:00Z, 7.5 hours before the alert went out and 155 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 192 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 864 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 126 m²/s²
0-3 km storm-relative helicity: 135 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Indianapolis, IN wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 20, 3:16 AM EDT, 16 minutes earlier.

Area forecast discussion, Aug 20, 3:16 AM EDT, 16 minutes before

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Hazardous weather outlook, Aug 19, 3:50 PM EDT, 11 hours 42 minutes before

Hazardous Weather Outlook
National Weather Service Indianapolis IN
350 PM EDT Wed Aug 19 2026

INZ021-028>031-035>049-054>057-202000-
Carroll-Warren-Tippecanoe-Clinton-Howard-Fountain-Montgomery-Boone-
Tipton-Hamilton-Madison-Delaware-Randolph-Vermillion-Parke-Putnam-
Hendricks-Marion-Hancock-Henry-Morgan-Johnson-Shelby-Rush-
350 PM EDT Wed Aug 19 2026

This hazardous weather outlook is for central Indiana.

.DAY ONE...Through Tonight.

Widespread minor to moderate river flooding will continue along the
Wabash, White, and East Fork White Rivers and adjacent lowlands.

A flood watch is in effect through 8 AM Thursday as training
thunderstorms over saturated soils could lead to localized flash
flooding. Isolated strong to severe storms are also possible with
primarily a damaging wind gust threat and potential for some hail.

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

Thunderstorms will be possible on Saturday. Severe weather is not
expected, but lightning is a hazard with any storm.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report rainfall amounts or any severe
weather later today into tonight.

&&

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

INZ051>053-060>065-067>072-202000-
Vigo-Clay-Owen-Sullivan-Greene-Monroe-Brown-Bartholomew-Decatur-Knox-
Daviess-Martin-Lawrence-Jackson-Jennings-
350 PM EDT Wed Aug 19 2026

This hazardous weather outlook is for central Indiana.

.DAY ONE...Through Tonight.

Widespread minor to moderate river flooding will continue along the
Wabash, White, and East Fork White Rivers and adjacent lowlands.

Scattered thunderstorms are possible late today into tonight. Isolated
strong to severe storms are also possible with primarily a damaging
wind gust threat and potential for some hail.

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

Thunderstorms will be possible on Saturday. Severe weather is not
expected, but lightning is a hazard with any storm.

.SPOTTER INFORMATION STATEMENT...

Spotters are encouraged to report rainfall amounts or any severe
weather later today into tonight.

&&

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

In the hours before

Local storm report, Aug 19, 10:17 PM EDT, 5 hours 15 minutes before

Preliminary Local Storm Report
National Weather Service Indianapolis IN
1017 PM EDT Wed Aug 19 2026

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

0515 PM     Tstm Wnd Dmg     1 E Alexandria          40.26N 85.66W
08/19/2026                   Madison            IN   Public

            A tree was blown down.

&&

BH

Local storm report, Aug 19, 11:22 PM EDT, 4 hours 10 minutes before

Preliminary Local Storm Report
National Weather Service Indianapolis IN
1122 PM EDT Wed Aug 19 2026

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

0630 PM     Flash Flood      6 SE Rossville          40.37N 86.51W
08/19/2026                   Clinton            IN   911 Call Center

            Located in north center Clinton County. Time
            estimated from radar.

&&

BH

Local storm report, Aug 19, 11:24 PM EDT, 4 hours 8 minutes before

Preliminary Local Storm Report
National Weather Service Indianapolis IN
1124 PM EDT Wed Aug 19 2026

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

0730 PM     Flash Flood      2 W Michigantown        40.33N 86.43W
08/19/2026                   Clinton            IN   911 Call Center

            Flash flooding in northeast Clinton County.
            Time estimated from radar.

&&

BH

Special weather statement, Aug 20, 12:46 AM EDT, 2 hours 46 minutes before

Special Weather Statement
National Weather Service Indianapolis IN
1246 AM EDT Thu Aug 20 2026

INZ036-043-044-051-052-200530-
Clay IN-Montgomery IN-Parke IN-Vermillion IN-Vigo IN-
1246 AM EDT Thu Aug 20 2026

...Strong thunderstorms will impact portions of Vigo, northwestern
Clay, Parke, Vermillion and southwestern Montgomery Counties through
130 AM EDT...

At 1245 AM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles west of Newport to 6 miles southwest of
Vermilion. Movement was east at 40 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...
Terre Haute, Brazil, Clinton, Rockville, Newport, West Terre Haute,
Fairview Park, Seelyville, Montezuma, Knightsville, Rosedale,
Harmony, Dana, Staunton, Waveland, Carbon, Universal, Mecca,
Bloomingdale, and Marshall.

This includes Interstate 70 between mile markers 1 and 25.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3991 8753 3991 8698 3987 8699 3987 8701
      3978 8701 3934 8711 3940 8753
TIME...MOT...LOC 0445Z 269DEG 36KT 3985 8752 3950 8765

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

Updike

Special weather statement, Aug 20, 2:45 AM EDT, 47 minutes before

Special Weather Statement
National Weather Service Indianapolis IN
245 AM EDT Thu Aug 20 2026

INZ047-048-052>057-060>065-067>072-200745-
Rush IN-Johnson IN-Daviess IN-Clay IN-Brown IN-Martin IN-Decatur IN-
Bartholomew IN-Shelby IN-Greene IN-Hancock IN-Knox IN-Owen IN-
Morgan IN-Lawrence IN-Sullivan IN-Jackson IN-Monroe IN-Marion IN-
Jennings IN-
245 AM EDT Thu Aug 20 2026

...A strong thunderstorm will impact portions of southern Hancock,
Monroe, Rush, Morgan, Decatur, Johnson, Knox, southern Owen, Martin,
southeastern Marion, Lawrence, Jackson, Jennings, Daviess, Shelby,
Brown, southeastern Sullivan, Bartholomew, south central Clay and
Greene Counties through 345 AM EDT...

At 245 AM EDT, Doppler radar was tracking a strong thunderstorm 9
miles southwest of Franklin, or 17 miles northwest of Columbus,
moving east at 45 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

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

Locations impacted include...
Indianapolis, Bloomington, Columbus, Shelbyville, Vincennes, Seymour,
Bedford, Greenwood, Franklin, Greenfield, Beech Grove, Martinsville,
Washington, Greensburg, Mooresville, North Vernon, Rushville, Linton,
Brownstown, and Bloomfield.

This includes the following highways...
 Interstate 65 between mile markers 37 and 107.
 Interstate 74 between mile markers 93 and 144.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3874 8750 3896 8751 3974 8608 3979 8530
      3927 8530 3920 8544 3891 8545 3891 8554
      3882 8563 3881 8579 3873 8588 3874 8591
      3878 8620 3869 8631 3869 8668 3853 8668
      3849 8695 3854 8743 3842 8774
TIME...MOT...LOC 0645Z 267DEG 37KT 3938 8615

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

McGINNIS

Local storm report, Aug 20, 3:01 AM EDT, 31 minutes before

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The office that day

Everything else NWS Indianapolis, IN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 19, 8:19 PM EDT	Severe Thunderstorm Warning	IND	Hancock, Henry, Rush	41 min
Aug 19, 8:37 PM EDT	Areal Flood Warning	IND	Carroll, Clinton, Tippecanoe	4 hr
Aug 19, 9:03 PM EDT	Areal Flood Advisory	IND	Delaware, Hancock, Henry, Madison, Randolph	5 hr
Aug 19, 9:35 PM EDT	Areal Flood Warning	IND	Warren	100 min
Aug 19, 10:19 PM EDT	Areal Flood Warning	IND	Boone, Fountain, Hendricks, Montgomery, Parke	3 hr
Aug 19, 10:36 PM EDT	Areal Flood Advisory	IND	Hamilton	112 min
Aug 19, 10:45 PM EDT	Areal Flood Warning	IND	Hamilton, Marion	107 min
Aug 19, 11:01 PM EDT	Areal Flood Advisory	IND	Clay, Hendricks, Morgan, Parke, Putnam	16 hr
Aug 19, 11:04 PM EDT	Areal Flood Advisory	IND	Hancock, Johnson, Rush, Shelby	16 hr
Aug 19, 11:13 PM EDT	Areal Flood Warning	IND	Clinton	69 min
Aug 19, 11:17 PM EDT	Areal Flood Advisory	IND	Boone, Clinton, Fountain, Montgomery, Tippecanoe, Warren	63 min
Aug 20, 12:15 AM EDT	Areal Flood Advisory	IND	Clinton, Tippecanoe	6 hr
Aug 20, 12:32 AM EDT	Areal Flood Advisory	IND	Hamilton, Marion	14 hr
Aug 20, 12:46 AM EDT	Areal Flood Advisory	IND	Parke	4 hr
Aug 20, 12:46 AM EDT	Special Weather Statement	IND	Clay, Parke, Vermillion, Vigo	44 min
Aug 20, 12:49 AM EDT	Areal Flood Warning	IND	Madison	7 hr
Aug 20, 12:56 AM EDT	Areal Flood Advisory	IND	Clay, Parke, Putnam, Vermillion, Vigo	4 hr
Aug 20, 1:12 AM EDT	Severe Thunderstorm Warning	IND	Clay, Parke, Putnam, Vermillion, Vigo	33 min
Aug 20, 1:38 AM EDT	Severe Thunderstorm Warning	IND	Clay, Greene, Morgan, Owen, Putnam, Sullivan and 1 more	37 min
Aug 20, 1:54 AM EDT	Severe Thunderstorm Warning	IND	Hendricks, Morgan, Owen, Putnam	51 min
Aug 20, 2:09 AM EDT	Severe Thunderstorm Warning	IND	Brown, Greene, Hendricks, Johnson, Lawrence, Marion and 3 more	36 min
Aug 20, 2:45 AM EDT	Special Weather Statement	IND	Bartholomew, Brown, Daviess, Decatur, Greene, Jackson and 10 more	60 min
Aug 20, 2:55 AM EDT	Flash Flood Warning	IND	Hendricks, Morgan, Putnam	6 hr
Aug 20, 3:44 AM EDT	River Flood Warning	IND	Tippecanoe	34 hr
Aug 20, 3:44 AM EDT	River Flood Warning	IND	Fountain, Parke, Tippecanoe, Vermillion, Warren	44 hr
Aug 20, 4:16 AM EDT	Areal Flood Advisory	IND	Hamilton	3 hr
Aug 20, 4:36 AM EDT	Areal Flood Advisory	IND	Martin	3 hr
Aug 20, 8:44 AM EDT	Areal Flood Warning	IND	Hamilton	26 hr
Aug 20, 9:55 AM EDT	River Flood Warning	IND	Monroe, Morgan, Owen	28 hr
Aug 20, 9:55 AM EDT	River Flood Warning	IND	Marion, Morgan	38 hr
Aug 20, 9:55 AM EDT	River Flood Warning	IND	Monroe, Morgan, Owen	8 hr
Aug 20, 10:00 AM EDT	River Flood Warning	IND	Clinton, Tippecanoe	13 hr
Aug 20, 12:34 PM EDT	River Flood Warning	IND	Jackson, Lawrence, Washington	3 days
Aug 20, 2:33 PM EDT	Areal Flood Warning	IND	Rush	12 hr
Aug 20, 6:31 PM EDT	River Flood Warning	IND	Bartholomew, Johnson, Shelby	27 hr

Nearby

Severe Thunderstorm Warnings in Indiana, 2026 Every severe thunderstorm warning in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.