A relatively weak cold front that worked through the state the previous day stalled out across northern Missouri and tracked back northward as a weak warm front and eventual stationary front.  Initially, storms were able to initiate in South Dakota along/north of the warm/stationary front and progress east/southeast through the evening and overnight hours of the 8th into the 9th.  Later that day, another round of storms moving out of Nebraska were able to strengthen with daytime heating and produce another round of heavy rainfall through portions of the state.  The greatest daily totals reached into the 4 to 5 inch range.

Heavy Rain in BUTLER, IOWA
From 09-SEP-16 07:45:00 to 09-SEP-16 10:15:00 (CST-6)
Location: PACKARD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Clarksville fire department reported heavy rainfall of 2.3 inches.  Much of the rainfall fell within 30 minutes.

Heavy Rain in BUTLER, IOWA
From 09-SEP-16 09:00:00 to 09-SEP-16 11:00:00 (CST-6)
Location: CLARKSVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 2.9 inches roughly over the last two hours.

Flash Flood in BUTLER, IOWA
From 09-SEP-16 12:00:00 to 09-SEP-16 12:00:00 (CST-6)
Location: CLARKSVILLE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported several rural roads north of Clarksville impassable due to water flowing over them. Time radar estimated.

Heavy Rain in BUTLER, IOWA
From 09-SEP-16 08:30:00 to 09-SEP-16 12:15:00 (CST-6)
Location: CLARKSVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 3.25 inches.  This is an updated rainfall total from an earlier report as rain has now stopped.

Heavy Rain in BUTLER, IOWA
From 09-SEP-16 08:30:00 to 09-SEP-16 12:15:00 (CST-6)
Location: CLARKSVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 4.17 inches storm total on the north end of town.

Heavy Rain in DALLAS, IOWA
From 09-SEP-16 14:30:00 to 09-SEP-16 15:10:00 (CST-6)
Location: HADDEN HILL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

NWS Employee reported heavy rainfall of 1.20 inches.

Heavy Rain in CRAWFORD, IOWA
From 09-SEP-16 12:00:00 to 09-SEP-16 15:00:00 (CST-6)
Location: DENISON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 1.2 inches.

Heavy Rain in FRANKLIN, IOWA
From 09-SEP-16 07:30:00 to 09-SEP-16 16:30:00 (CST-6)
Location: HAMPTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 4.4 inches.

Heavy Rain in BUTLER, IOWA
From 09-SEP-16 08:30:00 to 09-SEP-16 18:45:00 (CST-6)
Location: CLARKSVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Clarksville fire department reported heavy rainfall on the day of 4.6 inches.

Thunderstorm Wind in STORY, IOWA
From 09-SEP-16 14:20:00 to 09-SEP-16 14:20:00 (CST-6)
Location: AMES
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Large branch around 6 inches in diameter down on the Iowa State University campus west of the Food Science Building.