A weak, occluded surface low pressure system was situated northwest of the area with its associated boundaries draped across western and southern Iowa.  The environment south of the warm front/pseudo-stationary front was ripe with MUCAPE in excess of 300 J/kg, but devoid of many other supporting variables. Effective shear was borderline at best around 30 kts and DCAPE and hail CAPE were generally mediocre. Lending some credence to heavy rain, precipitable water values were around 1.7 inches or greater by the afternoon and the expectation of little overall movement to the surface fronts.
Storms initiated in the early afternoon near/along the warm/stationary front and were predominantly sub-severe given the inability to organize. Even so, a few strong to damaging wind gusts were observed early along with a quarter inch hail report. As storms drifted north of the boundary, they quickly weakened and turned into more of rain threat. As the afternoon and evening progressed, numerous other storms initiated around the cold front and occluded fronts further to the north and west and slowly drifted eastward. Areas in northern Iowa found themselves within an area that saw multiple slow-moving storms track across, resulting in heavy rainfall and a couple flash flooding reports. The greatest totals were public reported in the 3 to 4 inch range.

Flash Flood in KOSSUTH, IOWA
From 24-JUN-18 19:44:00 to 24-JUN-18 23:50:00 (CST-6)
Location: ALGONA MUNI ARPT
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 200.00K
Reported by: Emergency Manager

Emergency manager reported water over roadways in town, Highway 18 closed at Highway 169, and Highway 169 closed south of town.

Heavy Rain in KOSSUTH, IOWA
From 24-JUN-18 16:30:00 to 24-JUN-18 21:24:00 (CST-6)
Location: ALGONA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 3 inches.

Heavy Rain in WINNEBAGO, IOWA
From 24-JUN-18 16:30:00 to 24-JUN-18 22:33:00 (CST-6)
Location: FOREST CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 4 inches.

Thunderstorm Wind in MADISON, IOWA
From 24-JUN-18 13:45:00 to 24-JUN-18 13:45:00 (CST-6)
Location: EARLHAM
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Fire department reported trees down and power outages. Time was estimated from radar.

Hail in GUTHRIE, IOWA
From 24-JUN-18 14:25:00 to 24-JUN-18 14:25:00 (CST-6)
Location: WICHITA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported quarter sized hail.

Heavy Rain in KOSSUTH, IOWA
From 24-JUN-18 06:00:00 to 25-JUN-18 06:00:00 (CST-6)
Location: ALGONA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer recorded heavy rainfall of 2.22 inches over the last 24 hours.

Heavy Rain in WINNEBAGO, IOWA
From 24-JUN-18 06:00:00 to 25-JUN-18 06:00:00 (CST-6)
Location: FOREST CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer reported heavy rainfall of 2.88 inches over the last 24 hours.

Thunderstorm Wind in WINNEBAGO, IOWA
From 24-JUN-18 17:15:00 to 24-JUN-18 17:15:00 (CST-6)
Location: FOREST CITY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported branches down around town up to about 6 inches in diameter. This is a delayed report and time estimated from radar.

Thunderstorm Wind in MADISON, IOWA
From 24-JUN-18 13:55:00 to 24-JUN-18 13:55:00 (CST-6)
Location: EARLHAM
Magnitude: 61.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported 2 foot trees down on power lines in SW Earlham and a pole leaning over on SW 3rd St south of Elm St. This is a delayed report and time estimated from radar.

Flash Flood in WINNEBAGO, IOWA
From 24-JUN-18 17:30:00 to 24-JUN-18 17:30:00 (CST-6)
Location: FOREST CITY
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported 2 to 3 feet of water over Highway 9 and Highway 69 in Forest City and roads were going to be closed.

Heavy Rain in KOSSUTH, IOWA
From 24-JUN-18 18:30:00 to 24-JUN-18 21:04:00 (CST-6)
Location: LU VERNE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Broadcast media relayed report of heavy rainfall of 3.65 inches.

Heavy Rain in HANCOCK, IOWA
From 24-JUN-18 07:00:00 to 25-JUN-18 07:00:00 (CST-6)
Location: GARNER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer reported heavy rainfall of 2.19 inches over the last 24 hours.

Flood in KOSSUTH, IOWA
From 24-JUN-18 23:47:00 to 25-JUN-18 08:40:00 (CST-6)
Location: FENTON
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 200.00K
Reported by: Law Enforcement

Flooding was reported in Whittemore with some high stream flows along Hwy 169 near 130th street south of Algona. Flooding continued across portions of southern Kossuth County as well.