A strong low pressure system moved across central Indiana, bringing warm and humid air up with it. Thunderstorms developed with the low and along/ahead of its associated cold front during the late morning through the afternoon of November 18th. A weak tornado was also noted. Outside of storms, winds gusted over 40 mph.

Thunderstorm Wind in TIPPECANOE, INDIANA
From 18-NOV-17 11:23:00 to 18-NOV-17 11:23:00 (EST-5)
Location: DAYTON
Magnitude: 52.00 EG
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Trees were reported down near the intersection of County Roads 900 East and 200 South due to damaging thunderstorm wind gusts.

Thunderstorm Wind in MONTGOMERY, INDIANA
From 18-NOV-17 11:36:00 to 18-NOV-17 11:36:00 (EST-5)
Location: KIRKPATRICK
Magnitude: 52.00 EG
Property damage: 12.00K
Crop damage: 0.00K
Reported by: Public

Trees were downed across the road from where two pole barns were damaged due to damaging thunderstorm wind gusts.

Thunderstorm Wind in CLINTON, INDIANA
From 18-NOV-17 11:50:00 to 18-NOV-17 11:50:00 (EST-5)
Location: FRANKFORT
Magnitude: 74.00 EG
Property damage: 205.00K
Crop damage: 0.00K
Reported by: Public

Part of the Walmart's roof collapsed and the front of the store was damaged due to damaging straight-line thunderstorm winds. Two semi truck was knocked over as well.  One man inside an overturned truck was taken to the hospital for non-life threatening injuries. A church's steeple was bent by the severe wind.  Multiple trees and large branches were snapped and the roof of Frankfort High School sustained some minor damage. Many other homes and structures sustained damage as well.

Thunderstorm Wind in JOHNSON, INDIANA
From 18-NOV-17 13:10:00 to 18-NOV-17 13:10:00 (EST-5)
Location: SMITH VALLEY
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: NWS Employee

A tree, about one foot in diameter, was snapped at the base due to damaging thunderstorm wind gusts.

Thunderstorm Wind in DECATUR, INDIANA
From 18-NOV-17 16:46:00 to 18-NOV-17 16:46:00 (EST-5)
Location: KINGSTON
Magnitude: 52.00 EG
Property damage: 1.50K
Crop damage: 0.00K
Reported by: Emergency Manager

A tree was downed on power lines near the intersection of County Roads 300 North and 400 East due to damaging thunderstorm wind gusts.

Flood in TIPPECANOE, INDIANA
From 18-NOV-17 11:20:00 to 18-NOV-17 13:00:00 (EST-5)
Location: LAFAYETTE
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

There were multiple reports of water ponding in yards across Lafayette due to heavy rainfall.

Flood in BOONE, INDIANA
From 18-NOV-17 12:20:00 to 18-NOV-17 14:00:00 (EST-5)
Location: THORNTOWN
Flood cause: Heavy Rain
Property damage: 3.00K
Crop damage: 0.00K
Reported by: Public

Residential yards were reported to be flooded by heavy rainfall in Thorntown.

Flood in MADISON, INDIANA
From 18-NOV-17 14:20:00 to 18-NOV-17 16:00:00 (EST-5)
Location: WOODLAWN HGTS
Flood cause: Heavy Rain
Property damage: 3.50K
Crop damage: 0.00K
Reported by: Public

Residential yards and some roads were flooded due to heavy rainfall.

Tornado in TIPPECANOE, INDIANA
From 18-NOV-17 11:15:00 to 18-NOV-17 11:16:00 (EST-5)
Location: DAYTON
Tornado F-scale: EF0
Property damage: 8.00K
Crop damage: 0.00K
Reported by: NWS Storm Survey

This EF0 tornado touched down briefly northeast of Dayton and damaged a house and several trees. A few strips of siding was removed from the house and a few trees were downed as well.