After a very brief reprieve from multiple days of activity, another round of storms greeted large parts of central Iowa during the very early morning hours of the 14th, through the rest of the morning, and into the afternoon. Traditional severe weather in the form of hail and damaging winds were sporadic, while heavy rain and flash flooding was the main player. The hail and wind reports were low end severe with generally quarter to ping pong ball sized hail and winds less than 70 mph. Heavy rain was rather impressive with a number of spots receiving 4 to 6  inches of rain, which helped lead to periods of flash flooding.
The environment lended itself to heavy rain potential and marginal severe weather. Much of the state found itself on the cool side of a warm frontal boundary situated off to the west and the south.  Given the location in relation to the warm front and nocturnal initiation, MUCAPE values were modest at best around 1000 to 2000 J/kg in central Iowa with better values to the wets and south and lesser values further north and east. Effective shear values increased through the overnight hours with aid from the nocturnal low level jet, generally finding itself in the 30 to 40+ kt range. The aforementioned nocturnal low level jet not only aided in initiation, but also ushered in plentiful moisture allowing precipitable water values to approach the 1.5 to 2.0 inch range.

Heavy Rain in GREENE, IOWA
From 14-JUN-18 01:15:00 to 14-JUN-18 10:00:00 (CST-6)
Location: PATON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 2.00 inches.

Heavy Rain in HUMBOLDT, IOWA
From 14-JUN-18 04:15:00 to 14-JUN-18 10:30:00 (CST-6)
Location: UNIQUE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Iowa Environmental Mesonet forwarded report of heavy rainfall of 5.50 inches.

Flash Flood in POCAHONTAS, IOWA
From 14-JUN-18 09:45:00 to 14-JUN-18 12:45:00 (CST-6)
Location: POCAHONTAS
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported Highway 4 in Pocahontas was partially covered and some side streets in town were covered in water as well.

Hail in WEBSTER, IOWA
From 14-JUN-18 01:58:00 to 14-JUN-18 01:58:00 (CST-6)
Location: MOORLAND
Magnitude: 2.00 
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported 2 inch diameter hail.

Hail in STORY, IOWA
From 14-JUN-18 02:36:00 to 14-JUN-18 02:36:00 (CST-6)
Location: ONTARIO
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported quarter sized hail.

Flash Flood in HAMILTON, IOWA
From 14-JUN-18 09:30:00 to 14-JUN-18 13:30:00 (CST-6)
Location: ROSEDALE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 50.00K
Reported by: Law Enforcement

Law enforcement reported intersection of 380th St and Nelson closed due to water over the road.

Heavy Rain in JASPER, IOWA
From 14-JUN-18 01:30:00 to 14-JUN-18 11:35:00 (CST-6)
Location: KELLOGG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 5.25 inches.

Heavy Rain in POLK, IOWA
From 14-JUN-18 04:00:00 to 14-JUN-18 11:00:00 (CST-6)
Location: ALTOONA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Amateur radio operator reported heavy rainfall of 2.82 inches.

Heavy Rain in STORY, IOWA
From 14-JUN-18 02:10:00 to 14-JUN-18 07:45:00 (CST-6)
Location: AMES
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 2.40 inches.

Heavy Rain in STORY, IOWA
From 13-JUN-18 08:00:00 to 14-JUN-18 08:00:00 (CST-6)
Location: IOWA CENTER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.91 inches over the last 24 hours.

Flash Flood in WEBSTER, IOWA
From 14-JUN-18 06:57:00 to 14-JUN-18 12:45:00 (CST-6)
Location: CLARE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Emergency manager reported Highway C66 near Clare closed due to flash flooding. This is a delayed report from yesterday, time estimated from radar.

Flash Flood in BOONE, IOWA
From 14-JUN-18 10:31:00 to 14-JUN-18 14:15:00 (CST-6)
Location: SHELDAHL
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported water up to the bumpers on several vehicles in a parking lot near the Boone and Story county line on R38.

Heavy Rain in POCAHONTAS, IOWA
From 14-JUN-18 04:00:00 to 14-JUN-18 08:33:00 (CST-6)
Location: POCAHONTAS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 3.1 inches.

Heavy Rain in STORY, IOWA
From 14-JUN-18 02:00:00 to 14-JUN-18 08:40:00 (CST-6)
Location: AMES
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 4.50 inches.

Hail in MONROE, IOWA
From 14-JUN-18 09:35:00 to 14-JUN-18 09:35:00 (CST-6)
Location: ALBIA
Magnitude: 1.50 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported ping pong ball sized hail.

Heavy Rain in POLK, IOWA
From 14-JUN-18 04:00:00 to 14-JUN-18 05:37:00 (CST-6)
Location: ALTOONA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 2.43 inches.

Heavy Rain in POCAHONTAS, IOWA
From 13-JUN-18 06:00:00 to 14-JUN-18 06:00:00 (CST-6)
Location: POCAHONTAS MUNI ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Coop observer reported heavy rainfall of 3.10 inches over the last 24 hours.

Thunderstorm Wind in WAPELLO, IOWA
From 14-JUN-18 10:50:00 to 14-JUN-18 10:50:00 (CST-6)
Location: OTTUMWA
Magnitude: 56.00 EG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported a few large trees down on the north side of Ottumwa.

Flash Flood in HAMILTON, IOWA
From 14-JUN-18 09:30:00 to 14-JUN-18 13:30:00 (CST-6)
Location: STANHOPE
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 50.00K
Reported by: Law Enforcement

Law enforcement reported Highway 17 closed at County Road D65 due to water over the roadway.

Heavy Rain in HAMILTON, IOWA
From 14-JUN-18 02:00:00 to 14-JUN-18 10:00:00 (CST-6)
Location: WEBSTER CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Broadcast media reported heavy rainfall of 2.50 inches.

Heavy Rain in MAHASKA, IOWA
From 14-JUN-18 01:00:00 to 14-JUN-18 12:00:00 (CST-6)
Location: OSKALOOSA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 2.5 inches.

Heavy Rain in STORY, IOWA
From 14-JUN-18 02:00:00 to 14-JUN-18 11:00:00 (CST-6)
Location: SLATER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 2.50 inches.

Heavy Rain in STORY, IOWA
From 13-JUN-18 08:00:00 to 14-JUN-18 08:00:00 (CST-6)
Location: ONTARIO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

CoCoRaHS observer recorded heavy rainfall of 2.79 inches.

Heavy Rain in WEBSTER, IOWA
From 14-JUN-18 01:15:00 to 14-JUN-18 08:00:00 (CST-6)
Location: (FOD)FT DODGE MUNI A
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 3.65 inches.

Flood in BREMER, IOWA
From 13-JUN-18 11:11:00 to 13-JUN-18 17:30:00 (CST-6)
Location: FREDERIKA
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 100.00K
Reported by: Official NWS Observations

Minor flooding was reported along the Wapsipinicon River throughout the county and especially at Tripoli and along portions of the East Fork Wapsipinicon River throughout the county.

Flash Flood in STORY, IOWA
From 14-JUN-18 09:49:00 to 14-JUN-18 14:15:00 (CST-6)
Location: AMES
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Broadcast Media

WHO-TV, via social media, reported water roughly 2 to 3 feet deep on Grand Ave at the railroad underpass just north of Lincoln Way. Several cars were stalled out in the water.

Hail in GREENE, IOWA
From 14-JUN-18 08:48:00 to 14-JUN-18 08:48:00 (CST-6)
Location: SCRANTON
Magnitude: 1.00 
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported quarter sized hail.

Heavy Rain in STORY, IOWA
From 14-JUN-18 02:00:00 to 14-JUN-18 08:45:00 (CST-6)
Location: AMES
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 4.75 inches.

Heavy Rain in STORY, IOWA
From 14-JUN-18 02:00:00 to 14-JUN-18 09:16:00 (CST-6)
Location: AMES
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 5.4 inches.

Heavy Rain in STORY, IOWA
From 14-JUN-18 02:15:00 to 14-JUN-18 06:19:00 (CST-6)
Location: AMES ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Ames Municipal Airport ASOS recorded heavy rainfall of 2.61 inches.

Heavy Rain in STORY, IOWA
From 14-JUN-18 02:00:00 to 14-JUN-18 06:56:00 (CST-6)
Location: ONTARIO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

An NWS employee recorded heavy rainfall of 2.73 inches.

Thunderstorm Wind in WAPELLO, IOWA
From 14-JUN-18 10:45:00 to 14-JUN-18 10:45:00 (CST-6)
Location: OTTUMWA
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported a large tree down over power lines.

Heavy Rain in POLK, IOWA
From 14-JUN-18 04:00:00 to 14-JUN-18 10:12:00 (CST-6)
Location: ALTOONA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 3.43 inches.

Heavy Rain in POLK, IOWA
From 14-JUN-18 03:30:00 to 14-JUN-18 10:20:00 (CST-6)
Location: SAYDELL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 3.1 inches.

Heavy Rain in MARSHALL, IOWA
From 14-JUN-18 03:15:00 to 14-JUN-18 11:45:00 (CST-6)
Location: VAN CLEVE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 3.80 inches.

Flash Flood in POCAHONTAS, IOWA
From 14-JUN-18 06:40:00 to 14-JUN-18 12:45:00 (CST-6)
Location: POCAHONTAS
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 100.00K
Reported by: Public

Public reported ditches full and field covered in rain water. Highway 4 was partially covered with water as well.

Heavy Rain in STORY, IOWA
From 14-JUN-18 02:30:00 to 14-JUN-18 08:15:00 (CST-6)
Location: IOWA CENTER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 3.7 inches.

Heavy Rain in STORY, IOWA
From 14-JUN-18 02:00:00 to 14-JUN-18 08:25:00 (CST-6)
Location: ONTARIO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

NWS employee reported heavy rainfall of 3.60 inches.

Flash Flood in HAMILTON, IOWA
From 14-JUN-18 09:30:00 to 14-JUN-18 13:30:00 (CST-6)
Location: ROSEDALE
Flood cause: Heavy Rain
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Law enforcement reported water partially over the roadway.

Heavy Rain in STORY, IOWA
From 14-JUN-18 02:00:00 to 14-JUN-18 09:20:00 (CST-6)
Location: AMES
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 5.4 inches.

Heavy Rain in CALHOUN, IOWA
From 14-JUN-18 00:45:00 to 14-JUN-18 09:00:00 (CST-6)
Location: POMEROY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Public reported heavy rainfall of 2.05 inches.

Heavy Rain in WEBSTER, IOWA
From 14-JUN-18 01:30:00 to 14-JUN-18 11:00:00 (CST-6)
Location: FT DODGE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

WHOTV relayed report of heavy rainfall of 5.70 inches.

Heavy Rain in POLK, IOWA
From 14-JUN-18 03:45:00 to 14-JUN-18 07:00:00 (CST-6)
Location: ALTOONA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 2.63 inches.

Heavy Rain in STORY, IOWA
From 14-JUN-18 02:15:00 to 14-JUN-18 07:00:00 (CST-6)
Location: AMES
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Trained spotter reported heavy rainfall of 2.98 inches.

Heavy Rain in STORY, IOWA
From 14-JUN-18 02:15:00 to 14-JUN-18 09:24:00 (CST-6)
Location: SHIPLEY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Public reported heavy rainfall of 6.50 inches.

Heavy Rain in STORY, IOWA
From 14-JUN-18 02:00:00 to 14-JUN-18 10:28:00 (CST-6)
Location: ONTARIO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

An NWS employee reported heavy rainfall of 4.45 inches.

Thunderstorm Wind in WAPELLO, IOWA
From 14-JUN-18 10:30:00 to 14-JUN-18 10:30:00 (CST-6)
Location: (OTM)OTTUMWA INDSTRL
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Ottumwa Regional Airport ASOS recorded a 61 mph wind gust.