Iowa remained entrenched in the relative ring of fire weather pattern. Morning convection lingered across southern Minnesota and northern Iowa through the morning, before generally subsiding. By the early afternoon though, ingredients for severe weather were well in place with a shortwave moving through the parent flow, MUCAPE values in excess of 2000-3000 J/kg, effective shear around 40 kts, and 1-3 km SRH around 200-300 m2/s2.  All in all, it suggested a day with the potential for supercellular storms with all modes of severe weather possible. By the evening, as much as true with multiple funnel cloud or brief tornado touchdown reports, numerous hail reports, a couple of wind reports, and heavy rain in excess of 2 to 3 inches.

Thunderstorm Wind in CERRO GORDO, IOWA
From 09-JUN-18 14:54:00 to 09-JUN-18 14:54:00 (CST-6)
Location: (MCW)MASON CITY MUNI
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Mason City ASOS, near Clear Lake, recorded a 71 mph wind gust.

Hail in FRANKLIN, IOWA
From 09-JUN-18 18:45:00 to 09-JUN-18 18:45:00 (CST-6)
Location: BRADFORD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported nickel sized hail accompanied by heavy rain.

Hail in BUTLER, IOWA
From 09-JUN-18 19:00:00 to 09-JUN-18 19:00:00 (CST-6)
Location: AUSTINVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported mostly pea to nickel sized hail with a few to the size of quarters.

Hail in GRUNDY, IOWA
From 09-JUN-18 20:35:00 to 09-JUN-18 20:35:00 (CST-6)
Location: GRUNDY CENTER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported nickel sized hail.

Heavy Rain in CERRO GORDO, IOWA
From 09-JUN-18 06:00:00 to 10-JUN-18 06:00:00 (CST-6)
Location: MASON CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer recorded heavy rainfall of 3.70 inches over the last 24 hours.

Funnel Cloud in BUTLER, IOWA
From 09-JUN-18 16:44:00 to 09-JUN-18 16:44:00 (CST-6)
Location: BRISTOW
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported several quick funnels with a rapidly rotating wall cloud.

Heavy Rain in BREMER, IOWA
From 09-JUN-18 06:00:00 to 10-JUN-18 06:00:00 (CST-6)
Location: TRIPOLI
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer recorded heavy rainfall of 2.72 inches over the last 24 hours.

Flood in BUTLER, IOWA
From 09-JUN-18 04:57:00 to 10-JUN-18 04:40:00 (CST-6)
Location: GREENE
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 500.00K
Reported by: Law Enforcement

Flooding continued along the Shell Rock River with all campgrounds near Clarksville closed including Henry Woods State Park and Shell Rock Park due to flooding. A few businesses along the river were impacted as well.

Flood in CERRO GORDO, IOWA
From 09-JUN-18 20:48:00 to 10-JUN-18 08:45:00 (CST-6)
Location: CLEAR LAKE LAKE
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported flooding of various streets in and around Mason City, with creeks at bankfull or flooding areas in and around the city as well.

Hail in CERRO GORDO, IOWA
From 09-JUN-18 15:17:00 to 09-JUN-18 15:17:00 (CST-6)
Location: MASON CITY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported penny sized hail.

Flash Flood in CERRO GORDO, IOWA
From 09-JUN-18 15:50:00 to 09-JUN-18 15:50:00 (CST-6)
Location: CLEAR LAKE JCT
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported culverts are overwhelmed with water already covering half of the outside lines on Highway 65 at this location.

Funnel Cloud in WINNEBAGO, IOWA
From 09-JUN-18 13:18:00 to 09-JUN-18 13:18:00 (CST-6)
Location: THOMPSON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported a funnel cloud along Highway 9 between Buffalo Center and Thompson.

Funnel Cloud in WINNEBAGO, IOWA
From 09-JUN-18 14:11:00 to 09-JUN-18 14:11:00 (CST-6)
Location: FOREST CITY ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported a funnel cloud.

Hail in BUTLER, IOWA
From 09-JUN-18 16:49:00 to 09-JUN-18 16:49:00 (CST-6)
Location: GREENE
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported penny sized hail.

Hail in BUTLER, IOWA
From 09-JUN-18 17:10:00 to 09-JUN-18 17:10:00 (CST-6)
Location: CLARKSVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

KWWL relayed a public report of quarter sized hail.

Hail in FRANKLIN, IOWA
From 09-JUN-18 18:11:00 to 09-JUN-18 18:11:00 (CST-6)
Location: LATIMER
Magnitude: 1.75 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer reported golf ball sized hail.

Hail in FRANKLIN, IOWA
From 09-JUN-18 18:28:00 to 09-JUN-18 18:28:00 (CST-6)
Location: GENEVA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported nickel to quarter sized hail.

Funnel Cloud in WINNEBAGO, IOWA
From 09-JUN-18 13:25:00 to 09-JUN-18 13:25:00 (CST-6)
Location: SCARVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported a funnel cloud.

Hail in WINNEBAGO, IOWA
From 09-JUN-18 13:55:00 to 09-JUN-18 13:55:00 (CST-6)
Location: LELAND
Magnitude: 2.50 
Property damage: 20.00K
Crop damage: 50.00K
Reported by: Trained Spotter

Trained spotter reported up to 2.5 inch diameter hail.

Hail in WINNEBAGO, IOWA
From 09-JUN-18 14:00:00 to 09-JUN-18 14:00:00 (CST-6)
Location: LELAND
Magnitude: 2.00 
Property damage: 20.00K
Crop damage: 50.00K
Reported by: Social Media

Public reported up to 2 inch diameter hail.

Hail in CERRO GORDO, IOWA
From 09-JUN-18 14:44:00 to 09-JUN-18 14:44:00 (CST-6)
Location: (MCW)MASON CITY MUNI
Magnitude: 1.50 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported ping pong ball sized hail.

Flash Flood in CERRO GORDO, IOWA
From 09-JUN-18 15:47:00 to 09-JUN-18 20:50:00 (CST-6)
Location: WINNEBAGO HGTS
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported several roads in town reportedly under 1 to 2 feet of water.

Flash Flood in CERRO GORDO, IOWA
From 09-JUN-18 17:31:00 to 09-JUN-18 20:50:00 (CST-6)
Location: HANFORD
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Department of Highways

Iowa DOT reported US Highway 65 closure due to water over the roadway near mile marker 200.

Heavy Rain in BLACK HAWK, IOWA
From 09-JUN-18 06:00:00 to 10-JUN-18 06:00:00 (CST-6)
Location: CEDAR FALLS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

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