An occluded/occluding surface low pressure system slowly worked its way into western and southwest Iowa during the morning and afternoon of the 25th. Given its location, Iowa was situated north of the warm front, which was much further south into central Missouri. Even so, the environment was cool yet fairly saturated in the low levels with temperatures in the low to mid 70s and dew points in the mid to upper 60s.
Low level flow was up over the occluded front, providing additional lift, within an environment of around 1000 J/kg MUCAPE, effective shear up to around 40 kts, lifted condensation levels approaching 500 m at times, and plenty of low level 0-1 km storm relative helicity in excess of 200-300 m2/s2.  All in all, it was a ripe day for general moderate to heavy rainfall, funnel clouds, and weak landspout tornadoes. The majority of the action revolved around heavy rainfall that totaled in excess of 3 inches in many locations, but also involved multiple funnel cloud reports and a lone brief tornado near Delphos in Ringgold County.

Heavy Rain in POLK, IOWA
From 25-JUN-18 12:00:00 to 25-JUN-18 21:00:00 (CST-6)
Location: YOUNGSTOWN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 4 inches.

Heavy Rain in POLK, IOWA
From 25-JUN-18 12:00:00 to 25-JUN-18 20:50:00 (CST-6)
Location: ALTOONA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer reported heavy rainfall of 2.09 inches.

Heavy Rain in WARREN, IOWA
From 25-JUN-18 12:00:00 to 25-JUN-18 21:00:00 (CST-6)
Location: CLARKSON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Broadcast media relayed a public report of heavy rainfall of about 4 inches.

Heavy Rain in WARREN, IOWA
From 25-JUN-18 20:00:00 to 25-JUN-18 21:30:00 (CST-6)
Location: HARTFORD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 3.25 inches from about 9 pm through 10:30 pm last night. This is a delayed report.

Heavy Rain in POLK, IOWA
From 25-JUN-18 18:30:00 to 26-JUN-18 02:30:00 (CST-6)
Location: FT DES MOINES
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 2.97 inches from last night through early this morning.

Heavy Rain in POLK, IOWA
From 25-JUN-18 12:00:00 to 25-JUN-18 21:03:00 (CST-6)
Location: SANTIAGO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported heavy rainfall of 3.14 inches and that roadside ditches were full of water.

Heavy Rain in POLK, IOWA
From 25-JUN-18 12:00:00 to 25-JUN-18 20:00:00 (CST-6)
Location: DES MOINES
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

WHO relayed heavy rainfall report at their station of 2.67 inches via social media. WHO VIA SOCIAL MEDIA.

Heavy Rain in POLK, IOWA
From 25-JUN-18 12:00:00 to 25-JUN-18 20:00:00 (CST-6)
Location: FT DES MOINES
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 2.86 inches. They also reported that water was over the road at SW 9th during the height of the rainfall and some vehicles were stranded. This is a delayed report.

Heavy Rain in POLK, IOWA
From 25-JUN-18 12:00:00 to 26-JUN-18 03:00:00 (CST-6)
Location: DES MOINES
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter near Waveland Golf Course reported heavy rainfall of 2.12 inches yesterday through this morning.

Heavy Rain in WARREN, IOWA
From 25-JUN-18 06:00:00 to 26-JUN-18 06:00:00 (CST-6)
Location: INDIANOLA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

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

Heavy Rain in WARREN, IOWA
From 25-JUN-18 08:42:00 to 26-JUN-18 08:42:00 (CST-6)
Location: NORWALK
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.51 inches over the last 24 hours.

Heavy Rain in POLK, IOWA
From 25-JUN-18 08:44:00 to 26-JUN-18 08:44:00 (CST-6)
Location: BONDURANT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.17 inches over the last 24 hours.

Heavy Rain in WARREN, IOWA
From 25-JUN-18 08:45:00 to 26-JUN-18 08:45:00 (CST-6)
Location: NORWALK
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.03 inches over the last 24 hours.

Heavy Rain in WARREN, IOWA
From 25-JUN-18 12:00:00 to 26-JUN-18 02:15:00 (CST-6)
Location: NORWALK
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 2.51 inches from yesterday and overnight.

Heavy Rain in JASPER, IOWA
From 25-JUN-18 06:23:00 to 26-JUN-18 06:23:00 (CST-6)
Location: PRAIRIE CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Prairies City AWOS recorded heavy rainfall of 2.74 inches over the last 24 hours.

Flood in POLK, IOWA
From 26-JUN-18 02:25:00 to 26-JUN-18 08:45:00 (CST-6)
Location: RUNNELLS
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 100.00K
Reported by: Law Enforcement

Flooding continued across eastern portions of the county in and near Runnells and Mitchellville.

Heavy Rain in WARREN, IOWA
From 25-JUN-18 12:00:00 to 26-JUN-18 03:00:00 (CST-6)
Location: HARTFORD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 3.86 inches yesterday and overnight.

Funnel Cloud in RINGGOLD, IOWA
From 25-JUN-18 15:55:00 to 25-JUN-18 15:55:00 (CST-6)
Location: REDDING
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported a persistent funnel lasting over 5 minutes.

Funnel Cloud in MADISON, IOWA
From 25-JUN-18 17:51:00 to 25-JUN-18 17:51:00 (CST-6)
Location: BARNEY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

Chaser video shows a funnel cloud, but unknown if it reached the ground. This is a delayed report.

Heavy Rain in POLK, IOWA
From 25-JUN-18 12:00:00 to 26-JUN-18 02:30:00 (CST-6)
Location: DES MOINES
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter near Des Moines International Airport reported heavy rainfall of about 3 inches yesterday and overnight.

Heavy Rain in POLK, IOWA
From 25-JUN-18 12:00:00 to 25-JUN-18 20:04:00 (CST-6)
Location: (DSM)DES MOINES INTL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Des Moines International Airport ASOS recorded heavy rainfall of 2.66 inches so far.

Heavy Rain in POLK, IOWA
From 25-JUN-18 12:00:00 to 25-JUN-18 20:00:00 (CST-6)
Location: FT DES MOINES
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 3.08 inches.

Flash Flood in POLK, IOWA
From 25-JUN-18 20:39:00 to 25-JUN-18 20:39:00 (CST-6)
Location: DES MOINES
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported that heavy rainfall caused significant street flooding in and around Davis Ave and South Union St Monday evening. Moving water was of unknown depth. This is a delayed report.

Heavy Rain in POLK, IOWA
From 25-JUN-18 08:00:00 to 26-JUN-18 08:00:00 (CST-6)
Location: ALTOONA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.57 inches over the last 24 hours.

Heavy Rain in WARREN, IOWA
From 25-JUN-18 12:00:00 to 25-JUN-18 20:00:00 (CST-6)
Location: NORWALK
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 2.10 inches and that the creek in Windflower Park was moving swiftly and out of its banks in spots. They noted that it does not happen often.

Heavy Rain in WARREN, IOWA
From 25-JUN-18 08:00:00 to 26-JUN-18 08:00:00 (CST-6)
Location: HARTFORD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 3.86 inches over the last 24 hours.

Heavy Rain in JASPER, IOWA
From 25-JUN-18 12:00:00 to 26-JUN-18 03:00:00 (CST-6)
Location: COLFAX
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 3.5 inches from yesterday through early this morning.

Heavy Rain in POLK, IOWA
From 25-JUN-18 06:00:00 to 26-JUN-18 06:00:00 (CST-6)
Location: (DSM)DES MOINES INTL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Des Moines International Airport ASOS recorded heavy rainfall of 2.99 inches over the last 24 hours.

Flash Flood in POLK, IOWA
From 25-JUN-18 21:35:00 to 26-JUN-18 03:20:00 (CST-6)
Location: HASTIE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported that US 65 Southbound off-ramp at Exit 77 in Pleasant Hill was under water. The water receded after nearly 5 hours and 45 minutes. Ramp was back open at the time of the report, this is a delayed report.

Tornado in RINGGOLD, IOWA
From 25-JUN-18 16:14:00 to 25-JUN-18 16:16:00 (CST-6)
Location: DELPHOS
Tornado F-scale: EF0
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Storm Chaser

This tornado touched down in the hamlet of Delphos with tree debris being tossed around.  A rather diffuse funnel for much of its existence, very little damage occurred with this tornado.  The event was captured on video by a few different storm chasers.

Flood in JASPER, IOWA
From 26-JUN-18 02:25:00 to 26-JUN-18 08:45:00 (CST-6)
Location: BAXTER
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 100.00K
Reported by: Law Enforcement

Flooding continued across portions of Jasper County near the Baxter area and at the Colfax fairgrounds.

Flash Flood in POLK, IOWA
From 25-JUN-18 19:30:00 to 25-JUN-18 19:30:00 (CST-6)
Location: FT DES MOINES
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported significant street flooding with fast running water. Possibly due to low spot, but estimated depth of 12 to 15 inches, with a partially submerged vehicle. Time estimated from radar.

Flash Flood in WARREN, IOWA
From 25-JUN-18 19:40:00 to 25-JUN-18 19:55:00 (CST-6)
Location: CUMMING
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

State Patrol reported flooding on Interstate 35 northbound at mile marker 62.  The left lane was blocked due to water. Water was reported to have receded in about 10 to 15 minutes. This is a delayed report.

Heavy Rain in POLK, IOWA
From 25-JUN-18 12:00:00 to 25-JUN-18 20:15:00 (CST-6)
Location: FT DES MOINES
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 3.10 inches and included a picture of their rain gage.