It was a hail- and wind-filled day across large parts of Iowa as two distinct rounds of severe weather affected the state.  A remnant QLCS system moved out of the eastern Dakotas and southern Minnesota during the early morning hours, maintaining itself in a relatively ripe environment of 2000+ J/kg of MUCAPE and around 30 to 40 kts of effective shear (though fading through the morning). While the storms were able to maintain their vigor, sub-severe to severe hail was seen through parts of Pocahontas, Humboldt, Wright, and Calhoun Counties before they weakened and eventually subsided entirely.
Later that afternoon, as the surface boundary entered the state, storms once again fired up across the northern to north central areas of the state. The convective environment across the western half or so of the state was quite ripe with as much as 5000 to 6000 J/kg MUCAPE. Effective shear was lacking, however, with predominantly 35 kts or less existing.  Hail CAPE approached 1000 J/kg and DCAPE to around 1400 J/kg respectively, indicating the potential for both severe hail and severe downdrafts even with the lackluster shear profile. Afternoon convection saw initial isolated and multi-cell clusters form with hail as the primary threat evolving into a QLCS with a primary wind threat by the mid-evening hours. In total, in excess of 50 severe hail and wind reports were received, including a 2 inch hail report and numerous reports of tree and power line damage.

Hail in TAMA, IOWA
From 06-JUN-18 16:04:00 to 06-JUN-18 16:04:00 (CST-6)
Location: TRAER MUNI ARPT
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Broadcast media, KWWL, relayed a report of 2 inch hail from a viewer.

Thunderstorm Wind in MARION, IOWA
From 06-JUN-18 18:00:00 to 06-JUN-18 18:00:00 (CST-6)
Location: PELLA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported trees down in Pella.

Thunderstorm Wind in MARION, IOWA
From 06-JUN-18 18:03:00 to 06-JUN-18 18:03:00 (CST-6)
Location: DURHAM
Magnitude: 61.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported power lines down near Howell Station Campground on 198th Place.

Hail in GRUNDY, IOWA
From 06-JUN-18 15:23:00 to 06-JUN-18 15:23:00 (CST-6)
Location: HOLLAND
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Broadcast media reported nickel sized hail.

Hail in HAMILTON, IOWA
From 06-JUN-18 15:26:00 to 06-JUN-18 15:26:00 (CST-6)
Location: STANHOPE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported quarter sized hail.

Thunderstorm Wind in POWESHIEK, IOWA
From 06-JUN-18 17:35:00 to 06-JUN-18 17:35:00 (CST-6)
Location: GRINNELL
Magnitude: 61.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported damage to utility poles, power lines down including high voltage lines, and debris throughout the city blocking streets.  Time estimated from AWOS gusts.

Thunderstorm Wind in POWESHIEK, IOWA
From 06-JUN-18 17:35:00 to 06-JUN-18 17:35:00 (CST-6)
Location: GRINNELL
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Grinnell Airport AWOS recorded a 63 mph wind gust.

Hail in HAMILTON, IOWA
From 06-JUN-18 15:27:00 to 06-JUN-18 15:27:00 (CST-6)
Location: STANHOPE
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported ping pong ball sized hail and still ongoing.

Hail in HAMILTON, IOWA
From 06-JUN-18 15:28:00 to 06-JUN-18 15:28:00 (CST-6)
Location: STANHOPE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter sized hail via social media.

Hail in POLK, IOWA
From 06-JUN-18 17:40:00 to 06-JUN-18 17:40:00 (CST-6)
Location: URBANDALE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

This is a delayed report, trained spotter reported nickel sized hail.

Thunderstorm Wind in JASPER, IOWA
From 06-JUN-18 17:40:00 to 06-JUN-18 17:40:00 (CST-6)
Location: LYNNVILLE
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported 2 large trees down (3 foot and 2.5 foot in diameter).

Hail in HAMILTON, IOWA
From 06-JUN-18 15:38:00 to 06-JUN-18 15:38:00 (CST-6)
Location: STANHOPE
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported several oblong pieces of hail up to golf ball sized along with consistent nickel to quarter sized hail.  The report came via social media.

Hail in CALHOUN, IOWA
From 06-JUN-18 15:44:00 to 06-JUN-18 15:44:00 (CST-6)
Location: LOHRVILLE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter sized hail.

Hail in POLK, IOWA
From 06-JUN-18 17:55:00 to 06-JUN-18 17:55:00 (CST-6)
Location: WINDSOR HGTS
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported quarter sized hail via the mPING application.

Hail in CARROLL, IOWA
From 06-JUN-18 18:00:00 to 06-JUN-18 18:00:00 (CST-6)
Location: MANNING
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported half dollar sized hail via social media.

Hail in HAMILTON, IOWA
From 06-JUN-18 15:45:00 to 06-JUN-18 15:45:00 (CST-6)
Location: JEWELL
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported golf ball sized hail.

Hail in BOONE, IOWA
From 06-JUN-18 16:08:00 to 06-JUN-18 16:08:00 (CST-6)
Location: JORDAN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported generally quarter sized hail falling in the last 5 minutes.

Hail in CRAWFORD, IOWA
From 06-JUN-18 16:14:00 to 06-JUN-18 16:14:00 (CST-6)
Location: WESTSIDE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter sized hail.

Hail in WEBSTER, IOWA
From 06-JUN-18 15:17:00 to 06-JUN-18 15:17:00 (CST-6)
Location: JUDD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter sized hail.

Thunderstorm Wind in DALLAS, IOWA
From 06-JUN-18 17:26:00 to 06-JUN-18 17:26:00 (CST-6)
Location: HADDEN HILL
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

NWS employee reported large tree branch down just north of Alice's Road and Waterford. Time estimated from radar.

Thunderstorm Wind in MARSHALL, IOWA
From 06-JUN-18 17:10:00 to 06-JUN-18 17:10:00 (CST-6)
Location: GILMAN
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported wind damage potentially including tree limbs and power poles broken. Time is estimated from radar, and came in via the mPING application.

Thunderstorm Wind in DALLAS, IOWA
From 06-JUN-18 17:28:00 to 06-JUN-18 17:28:00 (CST-6)
Location: DALLAS CENTER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Fire department reported wind gusts to 60 mph along with half inch hail.

Hail in STORY, IOWA
From 06-JUN-18 16:14:00 to 06-JUN-18 16:14:00 (CST-6)
Location: GILBERT
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported penny sized hail.

Thunderstorm Wind in HARDIN, IOWA
From 06-JUN-18 16:15:00 to 06-JUN-18 16:15:00 (CST-6)
Location: ELDORA
Magnitude: 53.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported tree down with winds measured at 61 mph from home weather station.

Thunderstorm Wind in STORY, IOWA
From 06-JUN-18 16:33:00 to 06-JUN-18 16:33:00 (CST-6)
Location: AMES
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported tree damage on the Iowa State University campus near Osborn Drive and Bessey Hall.

Thunderstorm Wind in STORY, IOWA
From 06-JUN-18 16:33:00 to 06-JUN-18 16:33:00 (CST-6)
Location: ONTARIO
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Broadcast media reported tree down along Hyland Drive just west of Iowa State University campus. Time estimated from radar.

Thunderstorm Wind in GRUNDY, IOWA
From 06-JUN-18 16:35:00 to 06-JUN-18 16:35:00 (CST-6)
Location: CONRAD
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported up to 65 mph wind gusts along with pea sized hail.

Hail in STORY, IOWA
From 06-JUN-18 16:39:00 to 06-JUN-18 16:39:00 (CST-6)
Location: AMES
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported dime to quarter sized hail and numerous 2 to 3 inche tree branches down in the neighborhood.

Hail in TAMA, IOWA
From 06-JUN-18 16:18:00 to 06-JUN-18 16:18:00 (CST-6)
Location: TRAER
Magnitude: 1.25 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

This is a delayed report. Public reported larger than quarter sized hail in Traer via multiple reports on social media including from KWWL, KCCI, KCRG.

Hail in BOONE, IOWA
From 06-JUN-18 16:20:00 to 06-JUN-18 16:20:00 (CST-6)
Location: NAPIER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported quarter sized hail.

Hail in POCAHONTAS, IOWA
From 06-JUN-18 05:50:00 to 06-JUN-18 05:50:00 (CST-6)
Location: POCAHONTAS
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported nickel sized hail.

Hail in HUMBOLDT, IOWA
From 06-JUN-18 08:47:00 to 06-JUN-18 08:47:00 (CST-6)
Location: DAKOTA CITY
Magnitude: 0.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported dime to penny sized hail.

Hail in STORY, IOWA
From 06-JUN-18 16:42:00 to 06-JUN-18 16:42:00 (CST-6)
Location: AMES ARPT
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter sized hail had been ongoing for at least 10 min.

Hail in CRAWFORD, IOWA
From 06-JUN-18 16:45:00 to 06-JUN-18 16:45:00 (CST-6)
Location: WESTSIDE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter sized hail.

Hail in STORY, IOWA
From 06-JUN-18 16:29:00 to 06-JUN-18 16:29:00 (CST-6)
Location: AMES
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported ping pong ball sized hail.

Hail in WEBSTER, IOWA
From 06-JUN-18 14:49:00 to 06-JUN-18 14:49:00 (CST-6)
Location: FT DODGE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported nickel sized hail.

Hail in WEBSTER, IOWA
From 06-JUN-18 14:54:00 to 06-JUN-18 14:54:00 (CST-6)
Location: FT DODGE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported lots of half inch hail with quarter sized hail now as well.

Hail in STORY, IOWA
From 06-JUN-18 16:30:00 to 06-JUN-18 16:30:00 (CST-6)
Location: AMES
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported a few tree limbs down along with quarter sized hail.

Thunderstorm Wind in STORY, IOWA
From 06-JUN-18 16:49:00 to 06-JUN-18 16:49:00 (CST-6)
Location: NEVADA
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported an 8 inch tree limb down from an old tree between the 900 and 11 block of M Ave in Nevada.

Thunderstorm Wind in BOONE, IOWA
From 06-JUN-18 16:50:00 to 06-JUN-18 16:50:00 (CST-6)
Location: NAPIER
Magnitude: 66.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported a 76 mph wind gust that was measured by their home weather station.

Hail in WEBSTER, IOWA
From 06-JUN-18 15:00:00 to 06-JUN-18 15:00:00 (CST-6)
Location: FT DODGE
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported pea to nickel sized hail.

Hail in STORY, IOWA
From 06-JUN-18 16:39:00 to 06-JUN-18 16:39:00 (CST-6)
Location: ONTARIO
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

Local fire department reported ping pong ball sized hail. Time estimated from radar.

Hail in GRUNDY, IOWA
From 06-JUN-18 16:40:00 to 06-JUN-18 16:40:00 (CST-6)
Location: CONRAD
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported dime to quarter sized hail from about 5:40 pm to 5:50 pm with winds gusting between 30 and 40 mph.

Hail in HAMILTON, IOWA
From 06-JUN-18 15:05:00 to 06-JUN-18 15:05:00 (CST-6)
Location: STRATFORD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported ping pong and golf ball sized hail.

Hail in DALLAS, IOWA
From 06-JUN-18 17:00:00 to 06-JUN-18 17:00:00 (CST-6)
Location: WOODWARD
Magnitude: 1.75 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported golf ball sized hail.

Hail in CALHOUN, IOWA
From 06-JUN-18 09:35:00 to 06-JUN-18 09:35:00 (CST-6)
Location: KNOKE
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter sized hail at their home.

Hail in POCAHONTAS, IOWA
From 06-JUN-18 14:14:00 to 06-JUN-18 14:14:00 (CST-6)
Location: FONDA
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter sized hail.

Hail in CALHOUN, IOWA
From 06-JUN-18 15:15:00 to 06-JUN-18 15:15:00 (CST-6)
Location: ROCKWELL CITY
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported nickel sized hail. Time estimated from radar.

Thunderstorm Wind in STORY, IOWA
From 06-JUN-18 16:30:00 to 06-JUN-18 16:30:00 (CST-6)
Location: AMES ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported a large tree limb down.

Thunderstorm Wind in STORY, IOWA
From 06-JUN-18 16:32:00 to 06-JUN-18 16:32:00 (CST-6)
Location: AMES ARPT
Magnitude: 62.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Ames Municipal Airport ASOS recorded a 71 mph wind gust.

Thunderstorm Wind in MARION, IOWA
From 06-JUN-18 18:01:00 to 06-JUN-18 18:01:00 (CST-6)
Location: PELLA
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Pella RWIS on Highway 163 recorded a 62 mph wind gust.

Hail in ADAIR, IOWA
From 06-JUN-18 20:06:00 to 06-JUN-18 20:06:00 (CST-6)
Location: BRIDGEWATER
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Amateur radio operator reported quarter sized hail.

Hail in ADAIR, IOWA
From 06-JUN-18 20:11:00 to 06-JUN-18 20:11:00 (CST-6)
Location: BRIDGEWATER
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported nickel sized hail.

Hail in DALLAS, IOWA
From 06-JUN-18 20:49:00 to 06-JUN-18 20:49:00 (CST-6)
Location: MINBURN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported quarter sized hail.

Hail in DALLAS, IOWA
From 06-JUN-18 20:55:00 to 06-JUN-18 20:55:00 (CST-6)
Location: MINBURN
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Amateur radio reported nickel sized hail.

Thunderstorm Wind in MARION, IOWA
From 06-JUN-18 18:04:00 to 06-JUN-18 18:04:00 (CST-6)
Location: DURHAM
Magnitude: 61.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported tress, power lines, and some outbuildings flipped and destroyed near the intersection of Highway 92 and County Road T17.

Thunderstorm Wind in JASPER, IOWA
From 06-JUN-18 18:10:00 to 06-JUN-18 18:10:00 (CST-6)
Location: NEWTON
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported 65 mph wind gust.

Thunderstorm Wind in MARION, IOWA
From 06-JUN-18 18:11:00 to 06-JUN-18 18:11:00 (CST-6)
Location: KNOXVILLE
Magnitude: 61.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported trees and power lines downed in Knoxville.

Thunderstorm Wind in ADAIR, IOWA
From 06-JUN-18 18:54:00 to 06-JUN-18 18:54:00 (CST-6)
Location: HOWE
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported 60 mph wind gusts.