Numerous outflow boundaries from overnight convection re-fired across southwest Minnesota and northwest Iowa around mid afternoon as diurnal heating weakened the cap and increased MLCAPE to around 2000 J/kg. The leading edge of larger-scale lift began to move in late afternoon with jet streak punching toward central Nebraska ahead of a deep western U.S. trough, but overall deep-layer shear remained quite weak with right-moving and mean storm motion vector magnitudes at 10 knots or less northwest Iowa.

Flash Flood in DICKINSON, IOWA
From 24-JUN-18 16:19:00 to 24-JUN-18 17:30:00 (CST-6)
Location: LAKE PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Rainfall rates of 2 to 3 inches an hour produced significant street flooding in Lake Park.

Flash Flood in DICKINSON, IOWA
From 24-JUN-18 16:33:00 to 24-JUN-18 19:00:00 (CST-6)
Location: ARNOLDS PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Rainfall from 3 to 6 inches in a couple hours brought a rapid onset to flash flooding around the Iowa Great Lakes.  Significant street flooding began in Arnolds Park, with water flowing across and blocking Highway 71 at 1633CST.

Flash Flood in DICKINSON, IOWA
From 24-JUN-18 16:38:00 to 24-JUN-18 19:00:00 (CST-6)
Location: LAKE PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Heavy rainfall of 3 to 5 inches in a couple of hours created flash flooding in the upper Little Sioux River basin. State highway 9 was closed between 150th and 160th St. when a couple feet of water encroached on the roadway.

Flash Flood in DICKINSON, IOWA
From 24-JUN-18 17:04:00 to 24-JUN-18 19:00:00 (CST-6)
Location: ARNOLDS PARK
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Life threatening flooding was underway with a car completely submerged on Highway 71 due to rapidly rising water.

Flash Flood in DICKINSON, IOWA
From 24-JUN-18 17:09:00 to 24-JUN-18 19:00:00 (CST-6)
Location: WEST OKOBOJI
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Repeated bursts of heavy rain over a two hour period brought 4 to 6 inches of rainfall.  Water inundated State Highway 86, resulting in several stalled vehicles.

Flash Flood in DICKINSON, IOWA
From 24-JUN-18 17:57:00 to 24-JUN-18 19:15:00 (CST-6)
Location: WEST OKOBOJI
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

An estimated 5 inches of rainfall resulted in water across the road 7 miles west of Milford.

Flash Flood in WOODBURY, IOWA
From 24-JUN-18 21:30:00 to 24-JUN-18 23:00:00 (CST-6)
Location: SIOUX CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rainfall of 2 to 4 inches caused rapidly ponding water in lower urban areas of the Sioux City metro area. Manhole covers were blown off many roads in the downtown and Riverside areas, and water and debris flows covered many roadways. Several vehicles were disabled within the flood waters.

Flash Flood in SIOUX, IOWA
From 24-JUN-18 22:27:00 to 25-JUN-18 01:30:00 (CST-6)
Location: MIDDLEBURG
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy rainfall developing very late evening and early overnight totaled 2 to 4 inches across the area.  Flooding of small streams and creeks caused water to overflow the intersection of County Roads B40 and K64, closing roadways for a couple hours.

Flash Flood in WOODBURY, IOWA
From 24-JUN-18 23:15:00 to 25-JUN-18 01:30:00 (CST-6)
Location: SIOUX CITY
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A continuation of heavy rainfall in the Sioux City Metro area resulted in significant street flooding downtown.  Water reached inside a gas station near downtown.  Rainfall totals reached 4 to 6 inches in the flooded areas.

Hail in PLYMOUTH, IOWA
From 24-JUN-18 15:06:00 to 24-JUN-18 15:08:00 (CST-6)
Location: O LEARY
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Hail in PLYMOUTH, IOWA
From 24-JUN-18 15:43:00 to 24-JUN-18 15:45:00 (CST-6)
Location: REMSEN
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Hail in DICKINSON, IOWA
From 24-JUN-18 16:26:00 to 24-JUN-18 16:29:00 (CST-6)
Location: WEST OKOBOJI
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Hail in CLAY, IOWA
From 24-JUN-18 17:14:00 to 24-JUN-18 17:16:00 (CST-6)
Location: PETERSON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Thunderstorm Wind in DICKINSON, IOWA
From 24-JUN-18 16:38:00 to 24-JUN-18 16:40:00 (CST-6)
Location: WEST OKOBOJI
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Strong winds uprooted a mature tree which blocked the road in front of Taco House Restaurant.

Thunderstorm Wind in CLAY, IOWA
From 24-JUN-18 16:48:00 to 24-JUN-18 16:50:00 (CST-6)
Location: FOSTORIA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Strong winds downed a large tree and several power lines.