A line of thunderstorms moved across northeast Iowa during the afternoon of September 12th. These storms produced a weak tornado in the vicinity of Ossian (Winneshiek County) that damaged some farm buildings and numerous trees. A second tornado occurred northwest of Farmersburg (Clayton County). The damage from this tornado was limited to a few trees, some outbuildings and one home had branches impaled through a wall. In Marquette and McGregor (Clayton County) runoff from the heavy rains turned streets into mini-rivers leaving behind mud covered streets and sidewalks. State Highway 76 north of Marquette was closed because of a mudslide and downed trees.

Tornado in CLAYTON, IOWA
From 12-SEP-19 16:34:00 to 12-SEP-19 16:41:00 (CST-6)
Location: GUNDER
Tornado F-scale: EF0
Property damage: 30.00K
Crop damage: 3.00K
Reported by: NWS Storm Survey

A tornado touched down northwest of Farmersburg and moved northeast before dissipating southwest of Monona. Damage from the tornado was limited to some trees, a few outbuildings, and crops. One home did have some tree branches impaled through a wall.

Thunderstorm Wind in CHICKASAW, IOWA
From 12-SEP-19 14:57:00 to 12-SEP-19 14:57:00 (CST-6)
Location: DEERFIELD
Magnitude: 50.00 EG
Property damage: 2.00K
Crop damage: 0.00K
Reported by: Trained Spotter

The tops of several trees were blown down southwest of Alta Vista.

Thunderstorm Wind in CLAYTON, IOWA
From 12-SEP-19 17:04:00 to 12-SEP-19 17:04:00 (CST-6)
Location: CLAYTON CENTER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

An estimated 60 mph wind gust occurred in Clayton Center.

Flood in HOWARD, IOWA
From 12-SEP-19 16:00:00 to 12-SEP-19 19:00:00 (CST-6)
Location: FLORENCEVILLE
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

Runoff from heavy rain washed out or sent water over some gravel roads across the northwest portion of Howard County.

Flash Flood in CLAYTON, IOWA
From 12-SEP-19 17:45:00 to 12-SEP-19 21:45:00 (CST-6)
Location: MARQUETTE
Flood cause: Heavy Rain
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Runoff from heavy rain turned the streets of Marquette and McGregor into mini-rivers leaving behind mud covered streets and sidewalks. Water also got into the basements of some downtown businesses. Bloody Run county park was closed because of flooding along Bloody Run Creek.

Flash Flood in ALLAMAKEE, IOWA
From 12-SEP-19 20:45:00 to 13-SEP-19 01:00:00 (CST-6)
Location: WAUKON JCT
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Runoff from heavy rain caused mudslides and pushed down trees across the southeast corner of Allamakee County that closed State Highway 76 south of Waukon Junction. Numerous trails and campgrounds were closed in the Yellow River State Forest because of the flooding. Some county roads were closed because of culvert washouts or debris washed onto them from flood waters.

Tornado in WINNESHIEK, IOWA
From 12-SEP-19 15:49:00 to 12-SEP-19 15:55:00 (CST-6)
Location: OSSIAN
Tornado F-scale: EF0
Property damage: 60.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A weak tornado touched down south of Ossian. The tornado moved northeast before dissipating southeast of Ossian. Several farm buildings and numerous trees were damaged along the path of the tornado.