A mini-supercell developed over eastern Illinois on the afternoon of the 21st, intensifying and moving across central Indiana during the evening. The storm produced large hail throughout much of its track across the region, including some reports of hail covering the ground. The storm was at its most intense across Hendricks County and especially from near Danville through Brownsburg. Golf ball size hail along with wind gusts of 65 to 70 mph.

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:15:00 to 21-SEP-12 18:17:00 (EST-5)
Location: AVON
Magnitude: 1.00 
Reported by: CoCoRaHS

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:15:00 to 21-SEP-12 18:17:00 (EST-5)
Location: BROWNSBURG
Magnitude: 1.00 
Reported by: CoCoRaHS

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:17:00 to 21-SEP-12 18:19:00 (EST-5)
Location: WESTWOOD
Magnitude: 1.25 
Crop damage: 0.00K
Reported by: NWS Employee

Hail in MARION, INDIANA
From 21-SEP-12 18:18:00 to 21-SEP-12 18:20:00 (EST-5)
Location: SPEEDWAY
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:19:00 to 21-SEP-12 18:21:00 (EST-5)
Location: SIX PTS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:20:00 to 21-SEP-12 18:22:00 (EST-5)
Location: BROWNSBURG
Magnitude: 0.88 
Property damage: 0.00K
Reported by: Trained Spotter

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:25:00 to 21-SEP-12 18:27:00 (EST-5)
Location: AVON
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:25:00 to 21-SEP-12 18:27:00 (EST-5)
Location: BROWNSBURG
Magnitude: 1.00 
Reported by: CoCoRaHS

Hail in MARION, INDIANA
From 21-SEP-12 18:26:00 to 21-SEP-12 18:28:00 (EST-5)
Location: SPEEDWAY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Hail in MARION, INDIANA
From 21-SEP-12 18:37:00 to 21-SEP-12 18:39:00 (EST-5)
Location: BEECH GROVE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Hail in HANCOCK, INDIANA
From 21-SEP-12 18:40:00 to 21-SEP-12 18:42:00 (EST-5)
Location: GEM
Magnitude: 1.00 
Reported by: Trained Spotter

Hail in HANCOCK, INDIANA
From 21-SEP-12 18:56:00 to 21-SEP-12 18:58:00 (EST-5)
Location: FINLY
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in HENDRICKS, INDIANA
From 21-SEP-12 19:20:00 to 21-SEP-12 19:22:00 (EST-5)
Location: COATESVILLE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in RUSH, INDIANA
From 21-SEP-12 19:29:00 to 21-SEP-12 19:31:00 (EST-5)
Location: SEXTON
Magnitude: 1.75 
Reported by: Law Enforcement

Roadways were covered with hail.

Thunderstorm Wind in FOUNTAIN, INDIANA
From 21-SEP-12 17:15:00 to 21-SEP-12 17:15:00 (EST-5)
Location: YEDDO
Magnitude: 65.00 EG
Property damage: 15.00K
Reported by: Emergency Manager

Power lines were reported down at the intersection of County Roads 900 South and 270 East due to damaging thunderstorm wind gusts. Power lines were also downed at the intersection of US Highway 41 and County Road 800 South. Additionally, a roof was blown off a barn on County Road 900 South, just east of 270 East.

Thunderstorm Wind in PUTNAM, INDIANA
From 21-SEP-12 17:38:00 to 21-SEP-12 17:38:00 (EST-5)
Location: RACCOON
Magnitude: 61.00 EG
Property damage: 5.00K
Reported by: Law Enforcement

Trees were reported down at the intersection of Highways 231 and 236 due to damaging thunderstorm wind gusts.

Thunderstorm Wind in PUTNAM, INDIANA
From 21-SEP-12 17:49:00 to 21-SEP-12 17:49:00 (EST-5)
Location: CARPENTERSVILLE
Magnitude: 61.00 EG
Property damage: 5.00K
Reported by: Law Enforcement

Trees were reported down at North Putnam High School due to damaging thunderstorm wind gusts.

Hail in PUTNAM, INDIANA
From 21-SEP-12 17:40:00 to 21-SEP-12 17:40:00 (EST-5)
Location: RACCOON
Magnitude: 0.88 
Reported by: Emergency Manager

Thunderstorm wind gusts of 50 mph were also observed.

Thunderstorm Wind in MONTGOMERY, INDIANA
From 21-SEP-12 17:42:00 to 21-SEP-12 17:42:00 (EST-5)
Location: NEW ROSS
Magnitude: 56.00 EG
Reported by: Fire Department/Rescue

An estimated 65 mph thunderstorm wind gust was observed in this location, along with quarter size hail.

Thunderstorm Wind in HENDRICKS, INDIANA
From 21-SEP-12 17:45:00 to 21-SEP-12 17:45:00 (EST-5)
Location: NORTH SALEM
Magnitude: 52.00 EG
Property damage: 0.50K
Reported by: Amateur Radio

Multiple 4 to 6 inch diameter tree limbs were downed due to damaging thunderstorm wind gusts near the intersection of County Roads 900 North and 775 West.

Thunderstorm Wind in BOONE, INDIANA
From 21-SEP-12 17:55:00 to 21-SEP-12 17:55:00 (EST-5)
Location: ULEN
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: Trained Spotter

A two foot diameter, healthy tree was downed due to damaging thunderstorm wind gusts.

Thunderstorm Wind in HENDRICKS, INDIANA
From 21-SEP-12 17:55:00 to 21-SEP-12 17:55:00 (EST-5)
Location: MONTCLAIR
Magnitude: 52.00 EG
Property damage: 1.00K
Reported by: Amateur Radio

A two foot diameter, healthy tree was uprooted near the intersection of State Route 236 and County Road 400 West due to damaging thunderstorm wind gusts.

Hail in PUTNAM, INDIANA
From 21-SEP-12 17:44:00 to 21-SEP-12 17:46:00 (EST-5)
Location: ROACHDALE
Magnitude: 1.00 
Reported by: Emergency Manager

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:00:00 to 21-SEP-12 18:02:00 (EST-5)
Location: DANVILLE
Magnitude: 0.88 
Property damage: 0.00K
Reported by: Trained Spotter

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:03:00 to 21-SEP-12 18:05:00 (EST-5)
Location: TILDEN
Magnitude: 0.88 
Property damage: 0.00K
Reported by: Amateur Radio

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:06:00 to 21-SEP-12 18:08:00 (EST-5)
Location: NORTH SALEM
Magnitude: 1.75 
Reported by: Amateur Radio

Hail in HENDRICKS, INDIANA
From 21-SEP-12 17:58:00 to 21-SEP-12 18:00:00 (EST-5)
Location: NORTH SALEM
Magnitude: 1.00 
Reported by: Trained Spotter

An estimated thunderstorm wind gust of 50 mph was also observed.

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:02:00 to 21-SEP-12 18:04:00 (EST-5)
Location: DANVILLE
Magnitude: 1.25 
Reported by: Trained Spotter

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:05:00 to 21-SEP-12 18:07:00 (EST-5)
Location: PITTSBORO
Magnitude: 1.25 
Reported by: Amateur Radio

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:03:00 to 21-SEP-12 18:05:00 (EST-5)
Location: DANVILLE
Magnitude: 1.75 
Crop damage: 0.00K
Reported by: Amateur Radio

An estimated 30 mph thunderstorm wind gust was also observed.

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:08:00 to 21-SEP-12 18:10:00 (EST-5)
Location: BROWNSBURG
Magnitude: 0.75 
Reported by: Amateur Radio

An measured 52 mph thunderstorm wind gust was observed in this location, as the hail was covering the ground.

Thunderstorm Wind in HENDRICKS, INDIANA
From 21-SEP-12 18:11:00 to 21-SEP-12 18:11:00 (EST-5)
Location: BROWNSBURG
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

An estimated 60 mph thunderstorm wind gust was observed in this location.

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:11:00 to 21-SEP-12 18:13:00 (EST-5)
Location: AVON
Magnitude: 1.25 
Reported by: Amateur Radio

Thunderstorm Wind in MARION, INDIANA
From 21-SEP-12 18:15:00 to 21-SEP-12 18:15:00 (EST-5)
Location: INDIANAPOLIS SPEEDWA
Magnitude: 52.00 EG
Crop damage: 0.00K
Reported by: Amateur Radio

An estimated 60 mph thunderstorm wind gust was observed in this location, along with nickel size hail.

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:14:00 to 21-SEP-12 18:16:00 (EST-5)
Location: AVON
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: NWS Employee

Quarter sized hail covered the ground to approximately one foot deep.

Thunderstorm Wind in HENDRICKS, INDIANA
From 21-SEP-12 18:20:00 to 21-SEP-12 18:20:00 (EST-5)
Location: BROWNSBURG
Magnitude: 61.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Siding and shingles were blown off a home due to damaging thunderstorm wind gusts. Patio furniture and an gazebo were damaged at neighboring homes.

Hail in MARION, INDIANA
From 21-SEP-12 18:20:00 to 21-SEP-12 18:22:00 (EST-5)
Location: INDIANAPOLIS
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Broadcast Media

This report came from the WRTV6 studios.

Hail in MARION, INDIANA
From 21-SEP-12 18:20:00 to 21-SEP-12 18:22:00 (EST-5)
Location: VALLEY MILLS
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Hail in MARION, INDIANA
From 21-SEP-12 18:24:00 to 21-SEP-12 18:26:00 (EST-5)
Location: LYNHURST
Magnitude: 1.25 
Crop damage: 0.00K
Reported by: Amateur Radio

Thunderstorm Wind in MARION, INDIANA
From 21-SEP-12 18:26:00 to 21-SEP-12 18:26:00 (EST-5)
Location: SPEEDWAY
Magnitude: 56.00 EG
Crop damage: 0.00K
Reported by: Trained Spotter

An estimated 65 mph thunderstorm wind gust was observed in this location. The power was also reported to be out.

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:27:00 to 21-SEP-12 18:29:00 (EST-5)
Location: PITTSBORO
Magnitude: 1.75 
Property damage: 5.50K
Reported by: Trained Spotter

Tree limbs were also reported down and there was damage to siding.

Hail in MARION, INDIANA
From 21-SEP-12 18:35:00 to 21-SEP-12 18:37:00 (EST-5)
Location: WARREN PARK
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: Amateur Radio

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:07:00 to 21-SEP-12 18:09:00 (EST-5)
Location: BROWNSBURG
Magnitude: 1.00 
Reported by: Amateur Radio

Hail in MARION, INDIANA
From 21-SEP-12 18:10:00 to 21-SEP-12 18:12:00 (EST-5)
Location: TRADERS PT
Magnitude: 0.88 
Property damage: 0.00K
Reported by: Amateur Radio

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:11:00 to 21-SEP-12 18:13:00 (EST-5)
Location: BROWNSBURG
Magnitude: 1.50 
Reported by: Trained Spotter

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:12:00 to 21-SEP-12 18:14:00 (EST-5)
Location: AVON
Magnitude: 1.00 
Crop damage: 0.00K
Reported by: NWS Employee

Hail in MARION, INDIANA
From 21-SEP-12 18:35:00 to 21-SEP-12 18:37:00 (EST-5)
Location: SPEEDWAY
Magnitude: 0.88 
Crop damage: 0.00K
Reported by: Trained Spotter

Also, one and a half inches of rain was measured since 6:00 PM.

Hail in MARION, INDIANA
From 21-SEP-12 18:36:00 to 21-SEP-12 18:38:00 (EST-5)
Location: FIVE PTS
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in MARION, INDIANA
From 21-SEP-12 18:36:00 to 21-SEP-12 18:38:00 (EST-5)
Location: WARREN PARK
Magnitude: 1.50 
Crop damage: 0.00K
Reported by: Trained Spotter

Hail was covering the ground in this location.

Hail in HANCOCK, INDIANA
From 21-SEP-12 18:44:00 to 21-SEP-12 18:46:00 (EST-5)
Location: GEM
Magnitude: 1.75 
Reported by: Trained Spotter

Hail in HANCOCK, INDIANA
From 21-SEP-12 18:46:00 to 21-SEP-12 18:48:00 (EST-5)
Location: NEW PALESTINE
Magnitude: 0.88 
Property damage: 0.00K
Reported by: NWS Employee

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:14:00 to 21-SEP-12 18:16:00 (EST-5)
Location: AVON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in HENDRICKS, INDIANA
From 21-SEP-12 18:14:00 to 21-SEP-12 18:16:00 (EST-5)
Location: AVON
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in HANCOCK, INDIANA
From 21-SEP-12 18:51:00 to 21-SEP-12 18:53:00 (EST-5)
Location: GEM
Magnitude: 1.00 
Reported by: Amateur Radio

Hail in HANCOCK, INDIANA
From 21-SEP-12 19:06:00 to 21-SEP-12 19:08:00 (EST-5)
Location: GREENFIELD
Magnitude: 1.00 
Reported by: Public

Hail in RUSH, INDIANA
From 21-SEP-12 19:20:00 to 21-SEP-12 19:22:00 (EST-5)
Location: SEXTON
Magnitude: 1.00 
Reported by: Amateur Radio

Hail in MARION, INDIANA
From 21-SEP-12 18:40:00 to 21-SEP-12 18:42:00 (EST-5)
Location: CUMBERLAND
Magnitude: 1.00 
Reported by: Trained Spotter