A stalled front across Kansas and Missouri lifted north into Iowa the evening of September 5th, fueled by the increasing low-level jet. Shortly after midnight on the 6th, the front was situated over northern Iowa and convection out of Minnesota moved southeast into Iowa along the front and into a favorable convective environment as MUCAPE values rose between 2000 to 3000 J/kg. Steep mid level lapse rates of 8 C/km and deep layer shear of 50+ knots allowed for convection to quickly reach severe criteria. Golf ball sized hail and significant wind damage occured with these overnight storms. They were also efficient rain producers, with locations reporting between two to over 4 inches of rain in the heaviest cores.

Hail in BREMER, IOWA
From 05-SEP-20 23:46:00 to 05-SEP-20 23:46:00 (CST-6)
Location: READLYN
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

KWWL relayed a public report of golf ball sized hail.

Thunderstorm Wind in KOSSUTH, IOWA
From 06-SEP-20 01:54:00 to 06-SEP-20 01:54:00 (CST-6)
Location: MAYLAND ARPT
Magnitude: 72.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A personal weather station reported an 83 mph gust.

Thunderstorm Wind in WRIGHT, IOWA
From 06-SEP-20 02:40:00 to 06-SEP-20 02:40:00 (CST-6)
Location: OLAF
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of tree damage on property with pea sized hail. Report relayed via social media.

Thunderstorm Wind in WRIGHT, IOWA
From 06-SEP-20 02:50:00 to 06-SEP-20 02:50:00 (CST-6)
Location: CLARION ARPT
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Clarion airport AWOS reported a 51 knot gust.

Thunderstorm Wind in HARDIN, IOWA
From 06-SEP-20 03:27:00 to 06-SEP-20 04:10:00 (CST-6)
Location: IOWA FALLS
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reports multiple of trees down across the county from the northern border to Union.

Heavy Rain in KOSSUTH, IOWA
From 05-SEP-20 23:15:00 to 06-SEP-20 05:36:00 (CST-6)
Location: LAKOTA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A personal weather station reported 4.6 inches of rain.

Heavy Rain in KOSSUTH, IOWA
From 05-SEP-20 23:15:00 to 06-SEP-20 05:38:00 (CST-6)
Location: LAKOTA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A personal weather station reported 4.5 inches of rain.

Heavy Rain in WINNEBAGO, IOWA
From 05-SEP-20 23:30:00 to 06-SEP-20 05:38:00 (CST-6)
Location: BUFFALO CENTER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A personal weather station reported 3.44 inches of rain.

Heavy Rain in WINNEBAGO, IOWA
From 05-SEP-20 23:45:00 to 06-SEP-20 05:40:00 (CST-6)
Location: NEILS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A personal weather station reported 3.55 inches of rain.

Heavy Rain in WINNEBAGO, IOWA
From 05-SEP-20 23:45:00 to 06-SEP-20 05:39:00 (CST-6)
Location: BUFFALO CENTER ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A personal weather station reported 3.39 inches of rain.

Heavy Rain in WINNEBAGO, IOWA
From 05-SEP-20 23:45:00 to 06-SEP-20 05:40:00 (CST-6)
Location: THOMPSON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A personal weather station reported 4.57 inches of rain.

Heavy Rain in CERRO GORDO, IOWA
From 06-SEP-20 00:45:00 to 06-SEP-20 05:43:00 (CST-6)
Location: CLEAR LAKE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A personal weather station reported 2.31 inches of rain.

Heavy Rain in BUTLER, IOWA
From 06-SEP-20 01:30:00 to 06-SEP-20 05:44:00 (CST-6)
Location: AREDALE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A personal weather station reported 2 inches of rain.

Heavy Rain in CERRO GORDO, IOWA
From 06-SEP-20 01:30:00 to 06-SEP-20 06:00:00 (CST-6)
Location: SWALEDALE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A CoCoRaHS observer reported 2.04 inches of rain.

Hail in BLACK HAWK, IOWA
From 05-SEP-20 23:50:00 to 05-SEP-20 23:50:00 (CST-6)
Location: DUNKERTON
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

KWWL relayed a public report via social media of golfball sized hail.

Thunderstorm Wind in KOSSUTH, IOWA
From 06-SEP-20 01:44:00 to 06-SEP-20 01:44:00 (CST-6)
Location: LEDYARD
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 65 mph wind with marble sized hail. Report relayed via social media.

Thunderstorm Wind in KOSSUTH, IOWA
From 06-SEP-20 01:44:00 to 06-SEP-20 01:44:00 (CST-6)
Location: LEDYARD
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reports of downed limbs and power outages. Reports relayed via social media.