A large longwave trough was in place across much of the western and central US with an embedded shortwave. This provided a focus for storm development as it moved into a humid and unstable environment. Scattered convection eventually increased in coverage through the evening, producing quarter sized hail and damaging wind gusts. As convection grew upscale and moved into southern Iowa the severe threat diminished, though heavy rain continued to fall through the evening.

Hail in POLK, IOWA
From 14-JUL-20 18:45:00 to 14-JUL-20 18:45:00 (CST-6)
Location: GRIMES
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report via social media of 2 inch hail.

Hail in POLK, IOWA
From 14-JUL-20 18:45:00 to 14-JUL-20 18:45:00 (CST-6)
Location: ANKENY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of quarter sized hail.

Thunderstorm Wind in POLK, IOWA
From 14-JUL-20 18:45:00 to 14-JUL-20 18:45:00 (CST-6)
Location: DODGE FLD ARPT
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management reported several trees blown down in the Camp Dodge area along 70th.

Hail in POLK, IOWA
From 14-JUL-20 18:57:00 to 14-JUL-20 18:57:00 (CST-6)
Location: ANKENY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of quarter sized hail.

Heavy Rain in STORY, IOWA
From 14-JUL-20 18:15:00 to 14-JUL-20 18:58:00 (CST-6)
Location: ONTARIO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

NWS Employee reports 2.45 inches of rain over a 30 to 45 inute time period.

Thunderstorm Wind in POLK, IOWA
From 14-JUL-20 19:00:00 to 14-JUL-20 19:00:00 (CST-6)
Location: DODGE FLD ARPT
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported damage to several large trees.

Thunderstorm Wind in POLK, IOWA
From 14-JUL-20 19:07:00 to 14-JUL-20 19:07:00 (CST-6)
Location: LOVINGTON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 60 mph winds.

Thunderstorm Wind in POLK, IOWA
From 14-JUL-20 19:13:00 to 14-JUL-20 19:13:00 (CST-6)
Location: WEST DES MOINES
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of damage on Grand between 8th st and 4th st including large trees down, power lines down, and traffic signal blown down.

Thunderstorm Wind in POLK, IOWA
From 14-JUL-20 19:15:00 to 14-JUL-20 19:15:00 (CST-6)
Location: DODGE FLD ARPT
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reports all of the corn near Beaver Drive and highway 415 has been flattened in the same direction.

Thunderstorm Wind in POLK, IOWA
From 14-JUL-20 19:20:00 to 14-JUL-20 19:20:00 (CST-6)
Location: CLOVER HILLS
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of a large tree damaged near 22nd and Ashworth.

Heavy Rain in POLK, IOWA
From 14-JUL-20 18:23:00 to 14-JUL-20 19:23:00 (CST-6)
Location: ANKENY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of approximately 2 inches of rain in a hour.

Heavy Rain in POLK, IOWA
From 14-JUL-20 18:24:00 to 14-JUL-20 19:24:00 (CST-6)
Location: JOHNSTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Amateur radio report of 2.20 inches of rain in an hour.

Heavy Rain in POLK, IOWA
From 14-JUL-20 18:27:00 to 14-JUL-20 19:27:00 (CST-6)
Location: RIDER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 3.60 inches of rain in an hour.

Thunderstorm Wind in JASPER, IOWA
From 14-JUL-20 19:43:00 to 14-JUL-20 19:43:00 (CST-6)
Location: MONROE
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The Iowa Dept. of Transportation relayed a report of stop sign blown over at highway 163 on the west side of Monroe. Time estimated via radar.

Thunderstorm Wind in WARREN, IOWA
From 14-JUL-20 19:45:00 to 14-JUL-20 19:45:00 (CST-6)
Location: SANDYVILLE
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The Department of Transportation reported trees down along highway 92 near mile marker 140. Time estimated via radar.

Thunderstorm Wind in WARREN, IOWA
From 14-JUL-20 19:58:00 to 14-JUL-20 19:58:00 (CST-6)
Location: SANDYVILLE
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Department of Highways

The Department of transportation reported trees down near and just west of Sandyville along highway 92. Time estimated via radar.

Thunderstorm Wind in MARION, IOWA
From 14-JUL-20 20:09:00 to 14-JUL-20 20:09:00 (CST-6)
Location: PELLA
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public relayed picture of  6 inch diameter or larger tree branches down. Time estimated via radar.

Heavy Rain in POLK, IOWA
From 14-JUL-20 18:00:00 to 14-JUL-20 20:18:00 (CST-6)
Location: RIDER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Personal weather station reported 3.41 inches of rain in two hours.

Heavy Rain in POLK, IOWA
From 14-JUL-20 18:00:00 to 14-JUL-20 20:21:00 (CST-6)
Location: ORALABOR
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

A personal weather station reported 3.12 inches of rain in two hours.

Thunderstorm Wind in MARION, IOWA
From 14-JUL-20 20:21:00 to 14-JUL-20 20:21:00 (CST-6)
Location: NEPAS
Magnitude: 55.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency management relayed widespread crop damage including being stripped or blown over from roughly the Marion County - Warren County line east to 20th Place and McKinber St. There was also significant tree damage and power lines down in the area with damage to a residence including a camper and garage. Time estimated via radar.

Hail in MARION, IOWA
From 14-JUL-20 20:45:00 to 14-JUL-20 20:45:00 (CST-6)
Location: BEWBERN
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

KRLS radio relayed public pictures of hail slightly larger than quarters.

Heavy Rain in WARREN, IOWA
From 14-JUL-20 19:15:00 to 14-JUL-20 21:15:00 (CST-6)
Location: HARTFORD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report via social media of 2.4 inches of rain. Begin time estimated via radar.

Heavy Rain in MARION, IOWA
From 14-JUL-20 19:15:00 to 14-JUL-20 21:16:00 (CST-6)
Location: FIFIELD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Personal weather station reported 3.89 inches of rain in two hours. It was still raining at time of report.

Heavy Rain in POLK, IOWA
From 14-JUL-20 18:30:00 to 14-JUL-20 21:30:00 (CST-6)
Location: POLK CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

NWS Des Moines office measured 2.71 inches of rain in 3 hours.

Heavy Rain in POLK, IOWA
From 14-JUL-20 18:30:00 to 14-JUL-20 22:00:00 (CST-6)
Location: DODGE FLD ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

NWS employee reported 2.03 inches of rain.

Heavy Rain in WARREN, IOWA
From 14-JUL-20 19:00:00 to 14-JUL-20 22:33:00 (CST-6)
Location: INDIANOLA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of 3 inches of rain in just over 3 hours. Still raining at time of observation. Begin time eastimate via radar.

Heavy Rain in POLK, IOWA
From 14-JUL-20 05:00:00 to 15-JUL-20 05:00:00 (CST-6)
Location: ENTERPRISE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer reported a 24 hour rain total of 2.52 inches of rain.

Heavy Rain in WARREN, IOWA
From 14-JUL-20 05:04:00 to 15-JUL-20 05:04:00 (CST-6)
Location: NEW VIRGINIA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a 24 hour rain total of 4.8 inches, with most occurring between 930-1130 pm on July 14th. Still raining at time of observation.

Heavy Rain in POLK, IOWA
From 14-JUL-20 05:06:00 to 15-JUL-20 05:06:00 (CST-6)
Location: LOVINGTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A personal weather station recorded a 24 hour rain total of 2.16 inches.

Heavy Rain in POLK, IOWA
From 14-JUL-20 05:06:00 to 15-JUL-20 05:06:00 (CST-6)
Location: ORALABOR
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

A personal weather station recorded a 24 hour rain total of 2.2 inches.

Heavy Rain in CLARKE, IOWA
From 14-JUL-20 06:00:00 to 15-JUL-20 06:00:00 (CST-6)
Location: OSCEOLA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A CoCoRaHS station recorded a 24 hour rain total of 2.09 inches.

Heavy Rain in MONROE, IOWA
From 14-JUL-20 06:00:00 to 15-JUL-20 06:00:00 (CST-6)
Location: AVERY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A coop observer reported a 24 hour rain total of 2.02 inches.

Heavy Rain in STORY, IOWA
From 14-JUL-20 06:00:00 to 15-JUL-20 06:00:00 (CST-6)
Location: AMES
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A coop observer reported a 24 hour rain total of 2.61 inches.

Heavy Rain in UNION, IOWA
From 14-JUL-20 06:00:00 to 15-JUL-20 06:00:00 (CST-6)
Location: CRESTON ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A coop observer reported a 24 hour rain total of 2.63 inches.

Heavy Rain in WAYNE, IOWA
From 14-JUL-20 06:00:00 to 15-JUL-20 06:00:00 (CST-6)
Location: HARVARD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A CoCoRaHS observer reported a 24 hour rain total of 2.68 inches.

Heavy Rain in WAYNE, IOWA
From 14-JUL-20 06:00:00 to 15-JUL-20 06:00:00 (CST-6)
Location: SEYMOUR
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A CoCoRaHS observer reported a 24 hour rain total of 2.89 inches.

Heavy Rain in WAYNE, IOWA
From 14-JUL-20 06:00:00 to 15-JUL-20 06:00:00 (CST-6)
Location: ALLERTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A CoCoRaHS observer reported a 24 hour rain total of 2.3 inches.

Heavy Rain in LUCAS, IOWA
From 14-JUL-20 07:00:00 to 15-JUL-20 07:00:00 (CST-6)
Location: NORWOOD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A CoCoRaHS observer reported a 24 hour rain total of 2.1 inches.

Heavy Rain in MARION, IOWA
From 14-JUL-20 07:00:00 to 15-JUL-20 07:00:00 (CST-6)
Location: KNOXVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

A coop observer reported a 24 hour rain total of 2.1 inches.

Heavy Rain in WAYNE, IOWA
From 14-JUL-20 07:00:00 to 15-JUL-20 07:00:00 (CST-6)
Location: PROMISE CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

A CoCoRaHS observer reported a 24 hour rain total of 2.3 inches.

Heavy Rain in WARREN, IOWA
From 14-JUL-20 08:59:00 to 15-JUL-20 08:59:00 (CST-6)
Location: NEW VIRGINIA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a 24 hour storm total of 5 inches of rain as of 10 am.

Heavy Rain in WARREN, IOWA
From 14-JUL-20 10:06:00 to 15-JUL-20 10:06:00 (CST-6)
Location: COOL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a 24 hour rain total of 4.5 inches as of 11 am.

Heavy Rain in WAYNE, IOWA
From 14-JUL-20 10:38:00 to 15-JUL-20 10:38:00 (CST-6)
Location: HUMESTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported a 24 hour rain total of 2.21 inches.

Hail in BOONE, IOWA
From 14-JUL-20 17:20:00 to 14-JUL-20 17:20:00 (CST-6)
Location: MACKEY
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported quarter sixed hail north of Boone.

Funnel Cloud in BOONE, IOWA
From 14-JUL-20 17:40:00 to 14-JUL-20 17:40:00 (CST-6)
Location: LUTHER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Broadcast media relayed a public report of a funnel cloud.

Thunderstorm Wind in POLK, IOWA
From 14-JUL-20 18:05:00 to 14-JUL-20 18:05:00 (CST-6)
Location: LOVINGTON
Magnitude: 52.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report of trees down in the Beaverdale neighborhood. Time estimated via radar.

Thunderstorm Wind in POLK, IOWA
From 14-JUL-20 18:10:00 to 14-JUL-20 18:10:00 (CST-6)
Location: WEST DES MOINES
Magnitude: 50.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report via social media of a tree down in the road. Time estimated via radar.

Thunderstorm Wind in POLK, IOWA
From 14-JUL-20 18:15:00 to 14-JUL-20 18:15:00 (CST-6)
Location: SAYDELL
Magnitude: 54.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report via social media of power lines down. Time estimated via radar.

Hail in POLK, IOWA
From 14-JUL-20 18:44:00 to 14-JUL-20 18:44:00 (CST-6)
Location: GRIMES
Magnitude: 2.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public report via social media of 2 inch hail.