Heavy rainfall continued to affect the Midwest and portions of Iowa, though fortunately no severe weather (hail, winds, etc...) were experienced with this event. The overall pattern was not conducive for traditional severe weather, but with a short wave moving through the upper level flow, precipitable water values around 2 inches, decent 850 mb moisture transport, and MUCAPE values around 1000-1500 J/kg, heavy rainfall prevailed.
The majority of values were held in check below some of the large values seen earlier in the year, but a wide area from southwest to northeast Iowa did record 2 to around 3 inches of rainfall.

Heavy Rain in BREMER, IOWA
From 02-SEP-18 06:00:00 to 03-SEP-18 06:00:00 (CST-6)
Location: TRIPOLI
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer reported heavy rainfall of 2.05 inches over the last 24 hours.

Heavy Rain in UNION, IOWA
From 02-SEP-18 06:00:00 to 03-SEP-18 06:00:00 (CST-6)
Location: LORIMOR
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer reported heavy rainfall of 2.27 inches over the last 24 hours.

Flood in BREMER, IOWA
From 02-SEP-18 18:32:00 to 03-SEP-18 18:00:00 (CST-6)
Location: JANESVILLE
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 150.00K
Reported by: Emergency Manager

Emergency management reported multiple road closures due to standing or running water  over the roadways. Creeks across much of the county were overwhelmed with flooded fields as well. The Bremer County dispatch also noted closures at 200th and Hawthorne, 130th and Midway, 310th and Morgan, 1900 block of Marquis Rd, 200 block of 200th St. and 150th and Dakota.

Heavy Rain in GREENE, IOWA
From 02-SEP-18 04:25:00 to 03-SEP-18 04:25:00 (CST-6)
Location: PATON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 2.00 inches over the last 24 hours.

Heavy Rain in WARREN, IOWA
From 02-SEP-18 06:00:00 to 03-SEP-18 06:00:00 (CST-6)
Location: LACONA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer reported heavy rainfall of 2.99 inches over the last 24 hours.

Heavy Rain in CLARKE, IOWA
From 02-SEP-18 08:00:00 to 03-SEP-18 08:00:00 (CST-6)
Location: MURRAY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer reported heavy rainfall of 2.11 inches over the last 24 hours.

Heavy Rain in BREMER, IOWA
From 02-SEP-18 08:00:00 to 03-SEP-18 08:00:00 (CST-6)
Location: WAVERLY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer reported heavy rainfall of 2.06 inches over the last 24 hours.

Heavy Rain in MADISON, IOWA
From 02-SEP-18 08:00:00 to 03-SEP-18 08:00:00 (CST-6)
Location: WINTERSET
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer reported heavy rainfall of 2.85 inches over the last 24 hours.

Flood in BUTLER, IOWA
From 02-SEP-18 18:32:00 to 03-SEP-18 18:00:00 (CST-6)
Location: GREENE
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 150.00K
Reported by: Emergency Manager

Emergency management reported multiple road closures due to standing or running water  over the roadways. Creeks across much of the county were overwhelmed with flooded fields as well.

Heavy Rain in TAYLOR, IOWA
From 02-SEP-18 08:00:00 to 03-SEP-18 08:00:00 (CST-6)
Location: GUSS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer reported heavy rainfall of 2.05 inches over the last 24 hours.

Heavy Rain in UNION, IOWA
From 02-SEP-18 08:00:00 to 03-SEP-18 08:00:00 (CST-6)
Location: CRESTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer reported heavy rainfall of 2.26 inches over the last 24 hours.

Heavy Rain in WARREN, IOWA
From 02-SEP-18 08:00:00 to 03-SEP-18 08:00:00 (CST-6)
Location: NEW VIRGINIA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 2.10 inches over the last 24 hours.

Heavy Rain in ADAMS, IOWA
From 02-SEP-18 06:00:00 to 03-SEP-18 06:00:00 (CST-6)
Location: CORNING MUNI ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer reported heavy rainfall of 2.74 inches over the last 24 hours.

Heavy Rain in WARREN, IOWA
From 02-SEP-18 08:00:00 to 03-SEP-18 08:00:00 (CST-6)
Location: INDIANOLA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer reported heavy rainfall of 2.47 inches over the last 24 hours.

Flash Flood in BLACK HAWK, IOWA
From 03-SEP-18 13:05:00 to 03-SEP-18 13:05:00 (CST-6)
Location: NORTH CEDAR
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

KWWL relayed images of street flooding in Cedar Falls. The water appeared to be fairly rapidly moving in the image.

Heavy Rain in CLARKE, IOWA
From 03-SEP-18 15:10:00 to 03-SEP-18 15:40:00 (CST-6)
Location: MURRAY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported heavy rainfall of 2.20 inches over approximately the last 30 minutes.

Flash Flood in BUTLER, IOWA
From 02-SEP-18 13:15:00 to 02-SEP-18 18:30:00 (CST-6)
Location: PACKARD
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 100.00K
Reported by: Trained Spotter

A trained spotter reported that multiple gravel roads west of Plainfield have water flowing over them, as much as 2-3 feet deep.

Heavy Rain in WARREN, IOWA
From 02-SEP-18 08:00:00 to 03-SEP-18 08:00:00 (CST-6)
Location: NORWALK
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer reported heavy rainfall of 2.38 inches over the last 24 hours.

Heavy Rain in POLK, IOWA
From 03-SEP-18 00:00:00 to 03-SEP-18 12:00:00 (CST-6)
Location: (DSM)DES MOINES INTL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Des Moines International Airport ASOS recorded heavy rainfall of 2.31 inches over the last 12 hours.

Lightning in STORY, IOWA
From 01-SEP-18 23:00:00 to 01-SEP-18 23:00:00 (CST-6)
Location: ZEARING
Property damage: 1.00M
Crop damage: 0.00K
Reported by: Public

A local photographer came across a smoldering wind turbine that had been struck by lightning overnight. It also had previous damage from a tornado earlier in the year.

Flash Flood in BLACK HAWK, IOWA
From 03-SEP-18 13:25:00 to 03-SEP-18 13:25:00 (CST-6)
Location: CEDAR FALLS
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

KWWL relayed images of stalled cars in around 1 to 2 feet of water. The water did not look to be moving.

Heavy Rain in CLARKE, IOWA
From 02-SEP-18 23:00:00 to 03-SEP-18 15:35:00 (CST-6)
Location: MURRAY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 4.89 inches since midnight. They estimated that 2.5 inches of that was in the last 1 to 2 hours.

Heavy Rain in TAYLOR, IOWA
From 02-SEP-18 06:00:00 to 03-SEP-18 06:00:00 (CST-6)
Location: BEDFORD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer reported heavy rainfall of 2.10 inches over the last 24 hours.