An outflow boundary from overnight storms initiated a round of strong to severe thunderstorms north of Indianapolis before spreading through much of central and south central Indiana. Radar showed numerous weak microburst/downbursts at times through the late morning and early afternoon with minor tree damage noted in Hendricks and Marion county.  Across that same area and also across southern Putnam and northeastern Owen, storms remained stationary which led to pockets of 2-3 inches and flooding.

Thunderstorm Wind in MARION, INDIANA
From 25-AUG-21 10:15:00 to 25-AUG-21 10:15:00 (EST-5)
Location: WOODRUFF PLACE
Magnitude: 52.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Public

Several reports of medium to large tree branches blown over by thunderstorm wind gusts across the eastern portions of Indianapolis.  A large tree was also blown down near 10th street.

Thunderstorm Wind in HENDRICKS, INDIANA
From 25-AUG-21 10:52:00 to 25-AUG-21 10:52:00 (EST-5)
Location: AVON
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Public

Numerous medium to large tree limbs downed by thunderstorm wind gusts.  Minor street flooding also noted at the time the report was sent.

Thunderstorm Wind in HENDRICKS, INDIANA
From 25-AUG-21 10:52:00 to 25-AUG-21 10:52:00 (EST-5)
Location: AVON
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

A tree was blown down by thunderstorm wind gusts near Avon Intermediate West school and accompanied by dime size hail and torrential rain.

Thunderstorm Wind in HENDRICKS, INDIANA
From 25-AUG-21 10:54:00 to 25-AUG-21 10:54:00 (EST-5)
Location: AVON
Magnitude: 50.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Thunderstorm wind gusts blew over 30 feet of fences and trees of unknown size.

Thunderstorm Wind in HAMILTON, INDIANA
From 25-AUG-21 10:17:00 to 25-AUG-21 10:17:00 (EST-5)
Location: INDIANAPOLIS METRO A
Magnitude: 48.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

A large tree branch of unknown size was blown by non-severe thunderstorm wind gusts.  No other nearby reports.

Thunderstorm Wind in HENDRICKS, INDIANA
From 25-AUG-21 10:58:00 to 25-AUG-21 10:58:00 (EST-5)
Location: PLAINFIELD
Magnitude: 50.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Tree limbs and a few small trees were snapped by thunderstorm wind gusts.

Thunderstorm Wind in PUTNAM, INDIANA
From 25-AUG-21 10:32:00 to 25-AUG-21 10:32:00 (EST-5)
Location: PUTNAMVILLE
Magnitude: 50.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Multiple trees blown over by thunderstorm wind gusts in Putnamville with some trees landing on power lines.

Thunderstorm Wind in JOHNSON, INDIANA
From 25-AUG-21 11:12:00 to 25-AUG-21 11:12:00 (EST-5)
Location: FRANKLIN
Magnitude: 50.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Public

Several large tree limbs snapped by thunderstorm wind gusts across the town of Franklin.

Flash Flood in HENDRICKS, INDIANA
From 25-AUG-21 11:00:00 to 25-AUG-21 14:00:00 (EST-5)
Location: AVON
Flood cause: Heavy Rain
Property damage: 250.00K
Crop damage: 0.00K
Reported by: Public

Very intense rainfall led to brief flash flooding across portions of Avon and Plainfield.  Several roads had water over the curb while also rapidly flowing.  Avon High school was partially flooded after the roof began to leak.  2 reports of rainfall over 4 inches were received with the rainfall occurring over a period of less than 2 hours.

Flash Flood in MARION, INDIANA
From 25-AUG-21 11:00:00 to 25-AUG-21 14:00:00 (EST-5)
Location: CAMBY
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Public

Flooding along Madison Avenue between I-465  and Greenwood Park Mall deep enough to  warrant traffic flow to use left lane.  2 cars drove through flooded waters in southern Indianapolis and were submerged. Portions of Center Grove high school were flooded after the roof leaked due to the very intense rain.