Early June activity continued with yet another day of convective activity that included severe storms and heavy rainfall. A relatively stationary boundary was situated across the western and southern portions of the state, acting as a focus for convective activity throughout the morning and early afternoon as convection lingered from the previous day. While there was not much opportunity to recover thermodynamically due to cloud cover, MUCAPE values remained in excess of 1000 J/kg in areas of convection and up to 2000 to 3000 J/kg in areas just to the west or south of the convection. Supporting parameters suggested the opportunity for a few organized storms with effective shear in the 30 to 40 kt range and low level helicity in the 100 to 200 m2/s2 neighborhood. Another concern was the potential for training storms with the stationary boundary in place and expectations of low level jet aided initiation in the overnight hours.
In the end, a few severe storms were seen during the afternoon and evening hours, including hail approaching 2 inches in diameter, wind gusts to near 70 mph, and a vehicle heavily damaged from a lightning strike.  Heavy rainfall was also experienced, though fortunately most locations were spared the heaviest totals, with most in the 2 to 3.5 inch range and a couple in excess of 4 inches.

Heavy Rain in CASS, IOWA
From 10-JUN-18 06:00:00 to 11-JUN-18 06:00:00 (CST-6)
Location: ATLANTIC ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.60 inches over the last 24 hours.

Lightning in DALLAS, IOWA
From 11-JUN-18 00:05:00 to 11-JUN-18 00:05:00 (CST-6)
Location: DALLAS CENTER ARPT
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Lightning struck an internet antenna on the roof. The parts of the antenna were found laying in the grass about 10 yards away. The home was properly grounded, but still led to damage of most of the electronics in the home, including many of the electrical outlets and led some smoke but no fire inside the home. The strike also broke open a water line near the exit point in the basement. Homeowner was home at the time.

Heavy Rain in CASS, IOWA
From 10-JUN-18 06:00:00 to 11-JUN-18 06:00:00 (CST-6)
Location: ANITA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 3.45 inches.

Heavy Rain in CLARKE, IOWA
From 10-JUN-18 06:00:00 to 11-JUN-18 06:00:00 (CST-6)
Location: MURRAY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.15 inches over the last 24 hours.

Heavy Rain in MADISON, IOWA
From 10-JUN-18 06:00:00 to 11-JUN-18 06:00:00 (CST-6)
Location: WINTERSET
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.24 inches over the last 24 hours.

Heavy Rain in MADISON, IOWA
From 10-JUN-18 06:00:00 to 11-JUN-18 06:00:00 (CST-6)
Location: EARLHAM
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.00 inches over the last 24 hours.

Hail in MADISON, IOWA
From 10-JUN-18 19:50:00 to 10-JUN-18 19:50:00 (CST-6)
Location: TRURO
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported nickel sized hail.

Thunderstorm Wind in UNION, IOWA
From 10-JUN-18 23:05:00 to 10-JUN-18 23:05:00 (CST-6)
Location: CRESTON
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

An Iowa DOT RWIS station measured a 63 mph wind gust.

Heavy Rain in PALO ALTO, IOWA
From 10-JUN-18 08:00:00 to 11-JUN-18 08:00:00 (CST-6)
Location: RUTHVEN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Broadcast media, KICD Radio, relayed public report of heavy rainfall of 2.2 inches near Lost Island Lake over the last 24 hours.

Heavy Rain in PALO ALTO, IOWA
From 10-JUN-18 08:00:00 to 11-JUN-18 08:00:00 (CST-6)
Location: RUTHVEN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

KICD Radio relayed a public report of heavy rainfall of 4.5 inches over the last 24 hours.

Thunderstorm Wind in DECATUR, IOWA
From 11-JUN-18 00:21:00 to 11-JUN-18 00:21:00 (CST-6)
Location: (30I)LAMONI MUNI ARP
Magnitude: 58.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Lamoni Municipal Airport ASOS recorded a 67 mph wind gust.

Heavy Rain in DALLAS, IOWA
From 10-JUN-18 05:25:00 to 11-JUN-18 05:25:00 (CST-6)
Location: HADDEN HILL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 2.89 inches over roughly the last 24 hours.

Heavy Rain in CASS, IOWA
From 10-JUN-18 06:00:00 to 11-JUN-18 06:00:00 (CST-6)
Location: ATLANTIC
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer recorded heavy rainfall of 2.61 inches over the last 24 hours.

Heavy Rain in UNION, IOWA
From 10-JUN-18 06:00:00 to 11-JUN-18 06:00:00 (CST-6)
Location: THAYER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.12 inches over the last 24 hours.

Hail in DALLAS, IOWA
From 10-JUN-18 21:14:00 to 10-JUN-18 21:14:00 (CST-6)
Location: HADDEN HILL
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

NWS employee reported nickel sized hail.

Thunderstorm Wind in CLARKE, IOWA
From 10-JUN-18 22:58:00 to 10-JUN-18 22:58:00 (CST-6)
Location: MURRAY
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported a few large tree limbs roughly 4 to 6 inches in diameter down just southwest of Murray.  This is a delayed report and time estimated from radar.

Flood in BUTLER, IOWA
From 10-JUN-18 04:40:00 to 11-JUN-18 04:45:00 (CST-6)
Location: GREENE
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 100.00K
Reported by: Law Enforcement

Flooding is occurring along Flood Creek with several roads inundated.

Heavy Rain in UNION, IOWA
From 10-JUN-18 06:00:00 to 11-JUN-18 06:00:00 (CST-6)
Location: CRESTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHAS observer recorded heavy rainfall of 2.38 inches over the last 24 hours.

Heavy Rain in PALO ALTO, IOWA
From 10-JUN-18 08:00:00 to 11-JUN-18 08:00:00 (CST-6)
Location: GRAETTINGER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

KICD Radio relayed public report of heavy rainfall of 4.0 inches over the last 24 hours.

Thunderstorm Wind in UNION, IOWA
From 10-JUN-18 23:05:00 to 10-JUN-18 23:05:00 (CST-6)
Location: CRESTON ARPT
Magnitude: 56.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Creston Municipal Airport recorded a 64 mph wind gust.

Heavy Rain in UNION, IOWA
From 10-JUN-18 06:00:00 to 11-JUN-18 06:00:00 (CST-6)
Location: LORIMOR
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

CoCoRaHS observer recorded heavy rainfall of 2.27 inches over the last 24 hours.

Heavy Rain in POCAHONTAS, IOWA
From 10-JUN-18 07:00:00 to 11-JUN-18 07:00:00 (CST-6)
Location: POCAHONTAS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer recorded heavy rainfall of 2.5 inches over the last 24 hours.

Hail in PALO ALTO, IOWA
From 11-JUN-18 02:47:00 to 11-JUN-18 02:47:00 (CST-6)
Location: RUTHVEN
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Broadcast media, KICD, relayed reports of quarter sized hail.

Lightning in DALLAS, IOWA
From 10-JUN-18 18:25:00 to 10-JUN-18 18:25:00 (CST-6)
Location: DEXTER
Property damage: 30.00K
Crop damage: 0.00K
Reported by: NWS Employee

NWS Employee reported that a vehicle was struck by lightning at exit 100 on Interstate 80, badly damaging the vehicle. There were no injuries to the 3 passengers.

Thunderstorm Wind in CLARKE, IOWA
From 10-JUN-18 22:58:00 to 10-JUN-18 22:58:00 (CST-6)
Location: MURRAY
Magnitude: 61.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Public

Public reported multiple trees down, including one snapped at the trunk that was approximately 18 inches in diameter.  Several power lines were also reported down in town.

Thunderstorm Wind in UNION, IOWA
From 10-JUN-18 22:58:00 to 10-JUN-18 22:58:00 (CST-6)
Location: CRESTON
Magnitude: 56.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees and power lines down in Creston.  Time estimated from radar.

Hail in CLARKE, IOWA
From 10-JUN-18 23:00:00 to 10-JUN-18 23:15:00 (CST-6)
Location: LACELLE
Magnitude: 1.75 
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported wind driven hail up to golf ball sized lasting about 15 minutes.  Siding on the south side of the house was completely destroyed.