This event was a two part event for many.  Initially, storms developed in the Dakotas near the parent cold front, and proceeded to develop into an MCS and move into and across Iowa during the morning hours of the 11th.  Heavy rainfall and a couple damaging wind reports were reported.  During the afternoon and evening of the 11th, the parent frontal boundary slowly meandered into Iowa, initiating another round of storms. As the evening wore on it become more progressive and the leading MCS produced numerous damaging wind reports and additional heavy rainfall.  The greatest rainfall amounts reported exceeded 5 inches, and were primarily located north of Interstate 80.

Heavy Rain in APPANOOSE, IOWA
From 11-AUG-16 22:45:00 to 12-AUG-16 03:45:00 (CST-6)
Location: FORBUSH
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 2.10 inches.

Heavy Rain in UNION, IOWA
From 11-AUG-16 06:00:00 to 12-AUG-16 06:00:00 (CST-6)
Location: LORIMOR
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer reported heavy rainfall of 1.90 inches over the last 24 hours.

Heavy Rain in CASS, IOWA
From 11-AUG-16 06:00:00 to 12-AUG-16 06:00:00 (CST-6)
Location: MASSENA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer reported heavy rainfall of 1.46 inches over the last 24 hours.

Heavy Rain in POWESHIEK, IOWA
From 11-AUG-16 06:00:00 to 12-AUG-16 06:00:00 (CST-6)
Location: GUERNSEY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 3.70 inches over the last 24 hours roughly 4 miles south of Victor on the Iowa/Poweshiek county line.

Heavy Rain in ADAMS, IOWA
From 11-AUG-16 20:50:00 to 12-AUG-16 04:44:00 (CST-6)
Location: CORNING
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported heavy rainfall of 5.30 inches since about 9:50 pm Thursday night.

Heavy Rain in WARREN, IOWA
From 11-AUG-16 20:30:00 to 12-AUG-16 03:00:00 (CST-6)
Location: INDIANOLA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported storm total heavy rainfall of 1.25 inches.

Heavy Rain in HARDIN, IOWA
From 11-AUG-16 06:00:00 to 12-AUG-16 06:00:00 (CST-6)
Location: IOWA FALLS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer recorded heavy rainfall of 1.59 inches over the last 24 hours.

Heavy Rain in STORY, IOWA
From 11-AUG-16 06:00:00 to 12-AUG-16 06:00:00 (CST-6)
Location: ZEARING
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer reported heavy rainfall of 1.62 inches over the last 24 hours.

Heavy Rain in STORY, IOWA
From 11-AUG-16 17:00:00 to 12-AUG-16 02:00:00 (CST-6)
Location: AMES ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 4.00 inches a couple miles southeast of Ames Airport.

Heavy Rain in POWESHIEK, IOWA
From 11-AUG-16 06:00:00 to 12-AUG-16 06:00:00 (CST-6)
Location: MONTEZUMA
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.

Heavy Rain in BOONE, IOWA
From 11-AUG-16 17:30:00 to 12-AUG-16 02:00:00 (CST-6)
Location: MADRID
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported storm total heavy rainfall of 3.01 inches, via social media.

Heavy Rain in GREENE, IOWA
From 11-AUG-16 17:00:00 to 12-AUG-16 01:00:00 (CST-6)
Location: RIPPEY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported storm total heavy rainfall of 2.709 inches after 5 pm last night.

Heavy Rain in MARSHALL, IOWA
From 11-AUG-16 16:45:00 to 12-AUG-16 03:00:00 (CST-6)
Location: MARSHALLTOWN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported storm total heavy rainfall of 3.61 inches.

Heavy Rain in STORY, IOWA
From 11-AUG-16 16:45:00 to 12-AUG-16 02:30:00 (CST-6)
Location: COLO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported storm total heavy rainfall of 5.00 inches.

Heavy Rain in MARSHALL, IOWA
From 11-AUG-16 17:00:00 to 12-AUG-16 04:00:00 (CST-6)
Location: HAVERHILL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported storm total heavy rainfall of 2.90 inches.

Heavy Rain in DALLAS, IOWA
From 11-AUG-16 18:00:00 to 12-AUG-16 02:00:00 (CST-6)
Location: GRANGER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported storm total heavy rainfall of 2.30 inches.

Heavy Rain in POLK, IOWA
From 11-AUG-16 19:00:00 to 12-AUG-16 02:00:00 (CST-6)
Location: ANKENY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported storm total heavy rainfall of 2.75 inches.

Heavy Rain in BREMER, IOWA
From 11-AUG-16 06:27:00 to 12-AUG-16 06:27:00 (CST-6)
Location: TRIPOLI
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer recorded heavy rainfall of 1.19 inches over the last 24 hours.

Heavy Rain in STORY, IOWA
From 11-AUG-16 18:00:00 to 12-AUG-16 02:30:00 (CST-6)
Location: COLLINS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported storm total heavy rainfall of 2.00 inches.

Heavy Rain in POLK, IOWA
From 11-AUG-16 19:30:00 to 12-AUG-16 02:00:00 (CST-6)
Location: ANKENY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported storm total heavy rainfall of 2.40 inches.

Heavy Rain in STORY, IOWA
From 11-AUG-16 18:00:00 to 12-AUG-16 02:00:00 (CST-6)
Location: SLATER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported storm total heavy rainfall of 3.40 inches.

Heavy Rain in BOONE, IOWA
From 11-AUG-16 07:00:00 to 12-AUG-16 07:00:00 (CST-6)
Location: BOONE MUNI ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported a 24 hour heavy rainfall total of 5.03 inches, with 4.13 coming since Thursday Evening.

Heavy Rain in UNION, IOWA
From 11-AUG-16 20:30:00 to 12-AUG-16 07:00:00 (CST-6)
Location: CRESTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported storm total heavy rainfall of 2.17 inches.

Heavy Rain in BOONE, IOWA
From 11-AUG-16 16:45:00 to 12-AUG-16 01:30:00 (CST-6)
Location: MOINGONA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 5.50 inches since Thursday night.

Heavy Rain in STORY, IOWA
From 11-AUG-16 17:00:00 to 12-AUG-16 02:00:00 (CST-6)
Location: AMES ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported storm total heavy rainfall of 6.00 inches.

Heavy Rain in WARREN, IOWA
From 11-AUG-16 20:15:00 to 12-AUG-16 02:30:00 (CST-6)
Location: CUMMING
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 2.10 inches storm total.

Heavy Rain in STORY, IOWA
From 11-AUG-16 17:00:00 to 12-AUG-16 02:00:00 (CST-6)
Location: AMES ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 4.90 inches storm total.

Heavy Rain in POLK, IOWA
From 11-AUG-16 19:30:00 to 12-AUG-16 02:00:00 (CST-6)
Location: CARNEY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported storm total heavy rainfall of 3.70 inches.

Heavy Rain in ADAMS, IOWA
From 11-AUG-16 20:45:00 to 12-AUG-16 08:00:00 (CST-6)
Location: STRINGTOWN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported storm total heavy rainfall of 2.30 inches.

Heavy Rain in POCAHONTAS, IOWA
From 11-AUG-16 12:30:00 to 11-AUG-16 21:45:00 (CST-6)
Location: PLOVER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported storm total heavy rainfall of 5.10 inches.

Thunderstorm Wind in ADAIR, IOWA
From 11-AUG-16 07:32:00 to 11-AUG-16 07:32:00 (CST-6)
Location: HOWE
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported multiple trees and tree limbs down in Stuart and Menlo.  Largest tree was 12 inches in diameter.  Time estimated from radar.

Thunderstorm Wind in CARROLL, IOWA
From 11-AUG-16 18:56:00 to 11-AUG-16 18:56:00 (CST-6)
Location: DEDHAM
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

KCCI relayed a large tree trunk snapped via a viewer.

Thunderstorm Wind in GUTHRIE, IOWA
From 11-AUG-16 19:05:00 to 11-AUG-16 19:05:00 (CST-6)
Location: BAYARD
Magnitude: 56.00 EG
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported power lines down in town along with 4 to 6 inch tree limbs. Time estimated from radar.

Thunderstorm Wind in CASS, IOWA
From 11-AUG-16 19:10:00 to 11-AUG-16 19:10:00 (CST-6)
Location: ATLANTIC
Magnitude: 56.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported trees down, power lines down, and transformers blown in town.

Thunderstorm Wind in GUTHRIE, IOWA
From 11-AUG-16 19:23:00 to 11-AUG-16 19:23:00 (CST-6)
Location: HERNDON
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported flag pole blown over. Time estimated from radar.

Thunderstorm Wind in DALLAS, IOWA
From 11-AUG-16 19:59:00 to 11-AUG-16 19:59:00 (CST-6)
Location: WAUKEE
Magnitude: 52.00 EG
Property damage: 1.00K
Crop damage: 0.00K
Reported by: NWS Employee

NWS Employee reported numerous 3-4 inch branches down.  Time estimated by radar.

Thunderstorm Wind in DALLAS, IOWA
From 11-AUG-16 20:06:00 to 11-AUG-16 20:06:00 (CST-6)
Location: HADDEN HILL
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: NWS Employee

NWS employee reported large tree limbs and branches down roughly 6 to 8 inches in diameter.  Some trees had tops taken off as well.  Time estimated by radar.

Thunderstorm Wind in POLK, IOWA
From 11-AUG-16 20:07:00 to 11-AUG-16 20:07:00 (CST-6)
Location: GRIMES
Magnitude: 56.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: NWS Employee

NWS employee reported a couple large tree branches down, roughly 5 to 7 inches in diameter and 10 to 15 feet in length along East 1st St near intersection of Little Beaver Drive. Several small tree limbs down in town as well. Time estimated by radar.

Thunderstorm Wind in POLK, IOWA
From 11-AUG-16 20:10:00 to 11-AUG-16 20:10:00 (CST-6)
Location: GRIMES
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported 7 inch diameter tree snapped at the base.  Some 5 inch diameter trees partially uprooted or leaning.  Up to 90 percent of fruit crop stripped off trees.

Thunderstorm Wind in POLK, IOWA
From 11-AUG-16 20:10:00 to 11-AUG-16 20:10:00 (CST-6)
Location: DODGE FLD ARPT
Magnitude: 52.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: NWS Employee

NWS Employee reported several large tree branches down along NW Newgate Dr. in Johnston.  Trampoline heavily damaged as well.  Time estimated by radar.

Thunderstorm Wind in POLK, IOWA
From 11-AUG-16 20:15:00 to 11-AUG-16 20:15:00 (CST-6)
Location: URBANDALE
Magnitude: 56.00 EG
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Utility Company

Mid American Energy reported powerlines down in Urbandale, via social media. Time estimated from radar.

Heavy Rain in POCAHONTAS, IOWA
From 11-AUG-16 04:00:00 to 11-AUG-16 17:25:00 (CST-6)
Location: ROLFE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter measured heavy rainfall of 2.6 inches today.

Thunderstorm Wind in POLK, IOWA
From 11-AUG-16 20:25:00 to 11-AUG-16 20:25:00 (CST-6)
Location: ASHAWA
Magnitude: 61.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported 18 to 24 inch diameter tree downed through wooden fence.  Time and location estimated.  Delayed report.

Thunderstorm Wind in DALLAS, IOWA
From 11-AUG-16 19:46:00 to 11-AUG-16 19:46:00 (CST-6)
Location: ADEL
Magnitude: 56.00 EG
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported numerous trees and power lines down throughout Dallas County.  Cities affected include Adel, Dallas Center, Redfield, and Dexter.  Tree limb also reported on the EM's roof. Time estimated from when storm hit Adel.

Thunderstorm Wind in DALLAS, IOWA
From 11-AUG-16 20:08:00 to 11-AUG-16 20:08:00 (CST-6)
Location: HADDEN HILL
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported wind gust of 62 mph.

Hail in CRAWFORD, IOWA
From 11-AUG-16 17:50:00 to 11-AUG-16 17:50:00 (CST-6)
Location: KENWOOD
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported nickel sized hail.

Heavy Rain in WEBSTER, IOWA
From 11-AUG-16 04:45:00 to 11-AUG-16 18:17:00 (CST-6)
Location: FT DODGE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

WHO Radio reported heavy rainfall of 2.65 inches so far today.

Thunderstorm Wind in AUDUBON, IOWA
From 11-AUG-16 18:54:00 to 11-AUG-16 18:54:00 (CST-6)
Location: AUDUBON
Magnitude: 50.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Audubon airport mesonet station reported wind gust of 50 kts.

Thunderstorm Wind in POLK, IOWA
From 11-AUG-16 20:10:00 to 11-AUG-16 20:10:00 (CST-6)
Location: ASHAWA
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Public

Public reported large tree blown onto roof of two-story residence.  Time and location estimated from radar.

Thunderstorm Wind in AUDUBON, IOWA
From 11-AUG-16 18:55:00 to 11-AUG-16 18:55:00 (CST-6)
Location: AUDUBON
Magnitude: 60.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Audubon airport mesonet station recorded a 60 kt wind gust.

Thunderstorm Wind in CASS, IOWA
From 11-AUG-16 19:08:00 to 11-AUG-16 19:08:00 (CST-6)
Location: ATLANTIC ARPT
Magnitude: 51.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Atlantic AWOS recorded a 59 mph wind gust.

Thunderstorm Wind in POLK, IOWA
From 11-AUG-16 20:07:00 to 11-AUG-16 20:07:00 (CST-6)
Location: RIDER
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported 60 mph wind gusts along with a few tree branches down.

Thunderstorm Wind in POLK, IOWA
From 11-AUG-16 20:03:00 to 11-AUG-16 20:03:00 (CST-6)
Location: GRIMES
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported wind gust of 65 mph along with a few tree branches down.

Thunderstorm Wind in POLK, IOWA
From 11-AUG-16 20:09:00 to 11-AUG-16 20:09:00 (CST-6)
Location: DODGE FLD ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

NWS Employee reported 60 mph wind gusts.

Thunderstorm Wind in WARREN, IOWA
From 11-AUG-16 20:10:00 to 11-AUG-16 20:10:00 (CST-6)
Location: CUMMING
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported 5 to 6 inch diameter tree branch down in Cumming.  Reported via social media, time and location estimated from radar.

Thunderstorm Wind in UNION, IOWA
From 11-AUG-16 20:15:00 to 11-AUG-16 20:15:00 (CST-6)
Location: CRESTON ARPT
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Creston Airport AWOS recorded wind gust of 61 mph.

Thunderstorm Wind in CLARKE, IOWA
From 11-AUG-16 20:23:00 to 11-AUG-16 20:23:00 (CST-6)
Location: MURRAY
Magnitude: 55.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter measured a 63 mph wind gust on home weather station.

Hail in CRAWFORD, IOWA
From 11-AUG-16 18:01:00 to 11-AUG-16 18:01:00 (CST-6)
Location: DENISON
Magnitude: 0.88 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy Rain in DALLAS, IOWA
From 11-AUG-16 20:00:00 to 12-AUG-16 05:00:00 (CST-6)
Location: HADDEN HILL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 1.40 inches since 9pm Thursday night. Reported via social media.

Heavy Rain in TAYLOR, IOWA
From 11-AUG-16 05:00:00 to 12-AUG-16 05:00:00 (CST-6)
Location: BLOCKTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer recorded heavy rainfall of 1.38 inches over the last 24 hours.

Heavy Rain in JASPER, IOWA
From 11-AUG-16 19:15:00 to 12-AUG-16 05:10:00 (CST-6)
Location: NEWTON MUNI ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported heavy rainfall of 2.00 inches, via social media.

Heavy Rain in TAYLOR, IOWA
From 11-AUG-16 21:15:00 to 12-AUG-16 05:30:00 (CST-6)
Location: BEDFORD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported storm total heavy rainfall of 2.37 inches.

Thunderstorm Wind in DALLAS, IOWA
From 11-AUG-16 19:45:00 to 11-AUG-16 19:45:00 (CST-6)
Location: ADEL
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Measured at a home weather station.

Thunderstorm Wind in DALLAS, IOWA
From 11-AUG-16 20:10:00 to 11-AUG-16 20:10:00 (CST-6)
Location: HADDEN HILL
Magnitude: 60.00 EG
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Public

Public reported trees down, a roof torn off to the sheeting, fence busted, and garbage cans flying.

Heavy Rain in WRIGHT, IOWA
From 11-AUG-16 14:00:00 to 12-AUG-16 01:00:00 (CST-6)
Location: CLARION
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported storm total heavy rainfall of 3.00 inches.

Heavy Rain in STORY, IOWA
From 11-AUG-16 18:00:00 to 12-AUG-16 04:30:00 (CST-6)
Location: MAXWELL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported storm total heavy rainfall of 4.00 inches.

Heavy Rain in STORY, IOWA
From 11-AUG-16 17:30:00 to 12-AUG-16 02:00:00 (CST-6)
Location: HUXLEY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported storm total heavy rainfall of 5.00 inches.

Heavy Rain in HARDIN, IOWA
From 11-AUG-16 16:00:00 to 12-AUG-16 02:00:00 (CST-6)
Location: ELDORA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported storm total heavy rainfall of 4.10 inches.