June started off wet and fairly active, with widespread rain moving across the state in the form of a degrading quasi-linear convective system. Initially, the strongest portion of the QLCS tracked across the southeast portions of Iowa, following the MUCAPE gradient (1000-3000 J/kg) and better effective shear environment. While heavy rainfall was the most widespread effect, severe wind gusts were recorded in and around Atlantic, IA.  Further north, convective activity was less severe, primarily just rain, until a wake low developed and continued to track eastward. A number of severe wind gusts and damage reports were recorded, including a measured 88 mph gust in Hampton.  Lastly, as the parent low tracked across the state later in the day, a funnel cloud was pictured in the Readlyn area along the primary boundary.

Thunderstorm Wind in CASS, IOWA
From 02-JUN-18 00:48:00 to 02-JUN-18 00:48:00 (CST-6)
Location: ATLANTIC ARPT
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Atlantic Municipal Airport AWOS recorded a wind gust of 61 mph.

Thunderstorm Wind in CASS, IOWA
From 02-JUN-18 00:50:00 to 02-JUN-18 00:50:00 (CST-6)
Location: ATLANTIC ARPT
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Atlantic Municipal Airport AWOS recorded a 61 mph wind gust.

Thunderstorm Wind in CASS, IOWA
From 02-JUN-18 00:55:00 to 02-JUN-18 00:55:00 (CST-6)
Location: ATLANTIC
Magnitude: 57.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Atlantic Municipal Airport AWOS recorded a 66 mph wind gust.

Heavy Rain in CLARKE, IOWA
From 02-JUN-18 02:45:00 to 02-JUN-18 06:00:00 (CST-6)
Location: MURRAY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter recorded heavy rainfall of 2.25 inches storm total.

Thunderstorm Wind in CERRO GORDO, IOWA
From 02-JUN-18 07:19:00 to 02-JUN-18 07:19:00 (CST-6)
Location: (MCW)MASON CITY MUNI
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Mason City Municipal Airport ASOS recorded a 58 mph wind gust.

Thunderstorm Wind in FRANKLIN, IOWA
From 02-JUN-18 07:35:00 to 02-JUN-18 07:35:00 (CST-6)
Location: HAMPTON
Magnitude: 76.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Hampton Municipal Airport AWOS recorded an 88 mph wind gust.

Thunderstorm Wind in CERRO GORDO, IOWA
From 02-JUN-18 07:50:00 to 02-JUN-18 07:50:00 (CST-6)
Location: MASON CITY
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported large tree damage.

Thunderstorm Wind in BUTLER, IOWA
From 02-JUN-18 08:30:00 to 02-JUN-18 08:30:00 (CST-6)
Location: APLINGTON
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported a 2 foot diameter tree down.

Thunderstorm Wind in BUTLER, IOWA
From 02-JUN-18 08:35:00 to 02-JUN-18 08:35:00 (CST-6)
Location: PARKERSBURG
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Broadcast media, KWWL, reported 6 to 8 inch diameter trees down and other items blowing down the street.

Heavy Rain in DECATUR, IOWA
From 02-JUN-18 06:00:00 to 02-JUN-18 06:00:00 (CST-6)
Location: (30I)LAMONI MUNI ARP
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Lamoni Municipal Airport ASOS recorded heavy rainfall of 2.3 inches over the last 24 hours.

Heavy Rain in CLARKE, IOWA
From 02-JUN-18 02:45:00 to 02-JUN-18 06:30:00 (CST-6)
Location: MURRAY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter recorded heavy rainfall of 2.4 inches storm total.

Funnel Cloud in BREMER, IOWA
From 02-JUN-18 16:30:00 to 02-JUN-18 16:30:00 (CST-6)
Location: READLYN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

KWWL relayed a viewer photo of a funnel cloud.

Thunderstorm Wind in CERRO GORDO, IOWA
From 02-JUN-18 07:19:00 to 02-JUN-18 07:19:00 (CST-6)
Location: MASON CITY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported several instances of large branches down on trees on the east side of town.

Heavy Rain in CLARKE, IOWA
From 02-JUN-18 02:45:00 to 02-JUN-18 06:00:00 (CST-6)
Location: MURRAY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter recorded heavy rainfall of 2.36 inches storm total.

Thunderstorm Wind in WEBSTER, IOWA
From 02-JUN-18 06:05:00 to 02-JUN-18 06:05:00 (CST-6)
Location: (FOD)FT DODGE MUNI A
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported a 1 and 1/2 foot diameter tree down and estimated 50 plus mph wind gusts.  Report came via social media.