Alert archive / Indiana / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 177, NWS Indianapolis, IN

August 12, 20254 counties in Indiana

NWS Indianapolis, IN issued this severe thunderstorm warning at Aug 12, 2025, 6:31 PM EDT for 4 counties in Indiana. It was in force for 44 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 12, 2025, 6:31 PM EDT (22:31 UTC)
Expired: Aug 12, 2025, 7:15 PM EDT
In force: 44 min
Issued by: NWS Indianapolis, IN
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Clay County, IN, Owen County, IN, Sullivan County, IN, Vigo County, IN

The radar

The Indianapolis radar (KIND), 90 km from the middle of the area, began a volume at 22:35 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

Lincoln, IL (KILX), launched 12:00Z, 10.5 hours before the alert went out and 153 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: 738 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 1235 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 92 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 12, 3:58 PM EDT, 2 hours 33 minutes earlier.

Area forecast discussion, Aug 12, 3:58 PM EDT, 2 hours 33 minutes before

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Hazardous weather outlook, Aug 12, 3:55 PM EDT, 2 hours 36 minutes before

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In the hours before

Local storm report, Aug 12, 1:58 PM EDT, 4 hours 33 minutes before

Preliminary Local Storm Report
National Weather Service Indianapolis IN
158 PM EDT Tue Aug 12 2025

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

0140 PM     Tstm Wnd Gst     Brooklyn                39.54N 86.37W
08/12/2025  E50 MPH          Morgan             IN   Trained Spotter

            Also 0.42 inch rain in 10 minutes.

&&

CC

Special weather statement, Aug 12, 2:01 PM EDT, 4 hours 30 minutes before

Special Weather Statement
National Weather Service Indianapolis IN
Issued by National Weather Service Northern Indiana
201 PM EDT Tue Aug 12 2025

INZ047-055-121830-
Johnson IN-Marion IN-
201 PM EDT Tue Aug 12 2025

...A STRONG THUNDERSTORM WILL IMPACT JOHNSON AND SOUTHEASTERN MARION
COUNTIES THROUGH 230 PM EDT...

At 201 PM EDT, the public reported a strong thunderstorm 7 miles
southeast of Mooresville, or 16 miles south of Indianapolis, moving
east at 25 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Public.

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

Locations impacted include...
Indianapolis, Greenwood, Franklin, Southport, New Whiteland,
Whiteland, and Bargersville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3943 8595 3944 8625 3963 8625 3963 8632
      3968 8595
TIME...MOT...LOC 1801Z 267DEG 20KT 3955 8625

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

NWS

Special weather statement, Aug 12, 2:56 PM EDT, 3 hours 35 minutes before

Special Weather Statement
National Weather Service Indianapolis IN
256 PM EDT Tue Aug 12 2025

INZ056-121930-
Shelby IN-
256 PM EDT Tue Aug 12 2025

...A strong thunderstorm will impact portions of northern Shelby
County through 330 PM EDT...

At 255 PM EDT, Doppler radar was tracking a strong thunderstorm 9
miles northwest of Shelbyville, moving east at 25 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...
Shelbyville, Morristown, Fairland, and Boggstown.

This includes Interstate 74 between mile markers 103 and 117.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3952 8592 3969 8593 3970 8589 3970 8563
      3950 8563
TIME...MOT...LOC 1855Z 265DEG 15KT 3962 8590

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

White

Local storm report, Aug 12, 3:36 PM EDT, 2 hours 55 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 12, 1:44 PM EDT	Severe Thunderstorm Warning	IND	Morgan	31 min
Aug 12, 2:01 PM EDT	Special Weather Statement	IND	Johnson	29 min
Aug 12, 2:56 PM EDT	Special Weather Statement	IND	Shelby	34 min
Aug 12, 3:10 PM EDT	Areal Flood Warning	IND	Lawrence	3 hr
Aug 12, 3:13 PM EDT	Flash Flood Warning	IND	Monroe	3 hr
Aug 12, 3:18 PM EDT	Areal Flood Warning	IND	Shelby	3 hr
Aug 12, 7:27 PM EDT	Special Weather Statement	IND	Greene, Owen, Sullivan	33 min
Aug 12, 7:57 PM EDT	Special Weather Statement	IND	Greene	48 min

Nearby

Severe Thunderstorm Warnings in Indiana, 2025 Every severe thunderstorm warning in 2025

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.