A very moist airmass was in place with warm cloud depths near 4.5 km.  Precipitable water values were in the 2.2 to 2.4 inch range over a large part of Iowa.  A thunderstorm complex formed over eastern Nebraska during the evening of the 22nd.  The complex grew upscale into an MCC as it moved into Iowa.  Thunderstorms produced very heavy rainfall over southern Iowa.  A large area of two to four inch rainfall occurred over southern Iowa.  There were spotty reports near 5 inches.  The rain fell in areas that had received significant rainfall during the previous two days.  Flash flooding was reported in the Murray area of Clarke County.  Water was reported over U.S. Highway 69 south of Osceola.  Water of 12 to 18 inches in depth was reported in the Murray area with numerous roads closed, including Highway R15.  A line of strong storms moved through the Mason City area and dropped 1.5 inches of rain in about a half hour.  The heavy rain caused flash flooding in town and the roof of a Walmart store collapsed from the weight of the water.  Once the flash flooding ended, generally flooding continued through the afternoon and evening.  The most significant was in Clarke County where flood waters nearly closed Interstate 35.

Heavy Rain in MONROE, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 06:00:00 (CST-6)
Location: ALBIA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Rainfall during the past 24 hours was 3.48 inches.

Heavy Rain in POLK, IOWA
From 23-AUG-14 07:24:00 to 23-AUG-14 07:24:00 (CST-6)
Location: URBANDALE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall during the past 24 hours was 1.25 inches.

Heavy Rain in MARION, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 06:00:00 (CST-6)
Location: KNOXVILLE ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Rainfall during the past 24 hours was 1.54 inches.

Heavy Rain in LUCAS, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 06:00:00 (CST-6)
Location: CHARITON MUNI ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Rainfall during the past 24 hours was 1.47 inches.

Heavy Rain in WARREN, IOWA
From 23-AUG-14 06:49:00 to 23-AUG-14 06:49:00 (CST-6)
Location: NEW VIRGINIA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Rainfall of 4.7 inches in the past 24 hours.

Heavy Rain in HARDIN, IOWA
From 23-AUG-14 07:16:00 to 23-AUG-14 07:16:00 (CST-6)
Location: IOWA FALLS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall during the past 24 hours was 1.3 inches.

Flash Flood in WAYNE, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 10:00:00 (CST-6)
Location: PROMISE CITY
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Heavy Rain in HARDIN, IOWA
From 23-AUG-14 09:23:00 to 23-AUG-14 09:23:00 (CST-6)
Location: IOWA FALLS
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall of 1.3 inches in the past 24 hours.

Heavy Rain in WAYNE, IOWA
From 23-AUG-14 09:00:00 to 23-AUG-14 09:00:00 (CST-6)
Location: HUMESTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Rainfall of 3.5 inches in the past 24 hours.

Heavy Rain in CLARKE, IOWA
From 23-AUG-14 07:39:00 to 23-AUG-14 07:39:00 (CST-6)
Location: MURRAY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Rainfall of 3.2 inches this morning on top of 1.2 inches yesterday morning and 0.9 inches on Thursday.

Heavy Rain in MADISON, IOWA
From 23-AUG-14 07:50:00 to 23-AUG-14 07:50:00 (CST-6)
Location: TRURO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall during the past 24 hours was 4.25 inches.

Heavy Rain in CLARKE, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 06:00:00 (CST-6)
Location: MURRAY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Rainfall during the past 24 hours was 3.32 inches.

Flood in CLARKE, IOWA
From 23-AUG-14 07:39:00 to 23-AUG-14 21:15:00 (CST-6)
Location: MURRAY
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Several inches of water over 210th st from 2 southwest of Murray into Union County.

Heavy Rain in JASPER, IOWA
From 23-AUG-14 06:01:00 to 23-AUG-14 06:01:00 (CST-6)
Location: NEWTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall during the past 24 hours was 3.5 inches.

Heavy Rain in MARION, IOWA
From 23-AUG-14 08:30:00 to 23-AUG-14 08:30:00 (CST-6)
Location: OTLEY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall during the past 24 hours was 2.62 inches.

Heavy Rain in DALLAS, IOWA
From 23-AUG-14 07:27:00 to 23-AUG-14 07:27:00 (CST-6)
Location: SHULER MINE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall during the past 24 hours was 1.96 inches.

Heavy Rain in APPANOOSE, IOWA
From 23-AUG-14 07:49:00 to 23-AUG-14 07:49:00 (CST-6)
Location: GRIFFINSVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall of 2.25 inches in the past 24 hours.

Heavy Rain in TAMA, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 06:00:00 (CST-6)
Location: TOLEDO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall during the past 24 hours was 2.02 inches.

Heavy Rain in MAHASKA, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 06:00:00 (CST-6)
Location: OSKALOOSA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall during the past 24 hours was 1.52 inches.

Heavy Rain in LUCAS, IOWA
From 23-AUG-14 11:12:00 to 23-AUG-14 11:12:00 (CST-6)
Location: CHARITON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall of 3.0 inches in the past 24 hours.

Heavy Rain in DALLAS, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 06:00:00 (CST-6)
Location: HADDEN HILL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall of 1.59 inches in the past 24 hours.

Heavy Rain in POLK, IOWA
From 23-AUG-14 09:42:00 to 23-AUG-14 09:42:00 (CST-6)
Location: AVON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall of 1.75 inches in the past 24 hours.

Heavy Rain in WARREN, IOWA
From 23-AUG-14 11:44:00 to 23-AUG-14 11:44:00 (CST-6)
Location: CLARKSON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall during the previous 24 hours was 2.5 inches.

Flash Flood in CERRO GORDO, IOWA
From 23-AUG-14 07:18:00 to 23-AUG-14 08:30:00 (CST-6)
Location: MASON CITY
Flood cause: Heavy Rain
Property damage: 500.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The roof of a Walmart collapsed form water weight.  Water was deep enough to reach the roof on cars with several submerged along Highways 65 and 122.  Several roads were impassable in the city until around 0820 CST.

Heavy Rain in MARSHALL, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 06:00:00 (CST-6)
Location: MARSHALLTOWN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Rainfall during the past 24 hours was 2.80 inches.

Heavy Rain in UNION, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 06:00:00 (CST-6)
Location: LORIMOR
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall during the past 24 hours was 3.55 inches.

Heavy Rain in POLK, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 06:00:00 (CST-6)
Location: POLK CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Official NWS Observations

Rainfall during the past 6 hours was 1.27 inches.

Heavy Rain in MARSHALL, IOWA
From 23-AUG-14 04:42:00 to 23-AUG-14 04:42:00 (CST-6)
Location: MARSHALLTOWN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Rainfall during the past 24 hours was 2.83 inches.

Heavy Rain in ADAIR, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 06:00:00 (CST-6)
Location: GREENFIELD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall during the past 24 hours was 2.6 inches.

Heavy Rain in WAPELLO, IOWA
From 23-AUG-14 08:43:00 to 23-AUG-14 08:43:00 (CST-6)
Location: AGENCY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall of 3.00 inches in the past 24 hours.

Heavy Rain in CERRO GORDO, IOWA
From 23-AUG-14 08:08:00 to 23-AUG-14 08:08:00 (CST-6)
Location: MASON CITY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall of 2.75 inches in the past 24 hours.

Heavy Rain in ADAIR, IOWA
From 23-AUG-14 09:44:00 to 23-AUG-14 09:44:00 (CST-6)
Location: GREENFIELD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall of 3.5 inches in the past 24 hours 6 in the past 2 days..

Heavy Rain in ADAMS, IOWA
From 23-AUG-14 09:36:00 to 23-AUG-14 09:36:00 (CST-6)
Location: CORNING
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall of 3.75 inches in the past 24 hours.

Heavy Rain in TAYLOR, IOWA
From 23-AUG-14 04:30:00 to 23-AUG-14 04:30:00 (CST-6)
Location: NEW MARKET
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Rainfall during the past 24 hours was 1.35 inches.

Heavy Rain in WARREN, IOWA
From 23-AUG-14 08:28:00 to 23-AUG-14 08:28:00 (CST-6)
Location: MILO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall of 3.75 inches in the past 24 hours.

Heavy Rain in CLARKE, IOWA
From 23-AUG-14 07:20:00 to 23-AUG-14 07:20:00 (CST-6)
Location: OSCEOLA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall during the past 24 hours was 2.42 inches.

Heavy Rain in CASS, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 06:00:00 (CST-6)
Location: MASSENA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall during the past 24 hours was 1.81 inches.

Heavy Rain in DALLAS, IOWA
From 23-AUG-14 08:26:00 to 23-AUG-14 08:26:00 (CST-6)
Location: HADDEN HILL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall of 3.31 inches in the past 24 hours, 5.98 inches since Thursday.

Heavy Rain in MONROE, IOWA
From 23-AUG-14 07:22:00 to 23-AUG-14 07:22:00 (CST-6)
Location: ALBIA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall during the past 24 hours was 3.75 inches.

Flash Flood in CLARKE, IOWA
From 23-AUG-14 05:10:00 to 23-AUG-14 11:15:00 (CST-6)
Location: MURRAY
Flood cause: Heavy Rain
Property damage: 250.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A trained spotter reported water over the roads with sewers backing up all over Murray  Water 12 to 18 inces deep and running across Highway R15.

Heavy Rain in MARSHALL, IOWA
From 23-AUG-14 05:17:00 to 23-AUG-14 05:17:00 (CST-6)
Location: MARSHALLTOWN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall during the past 24 hours was 2.55 inches.

Heavy Rain in MONROE, IOWA
From 23-AUG-14 05:00:00 to 23-AUG-14 05:00:00 (CST-6)
Location: AVERY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Rainfall during the past 24 hours was 3.90 inches.

Heavy Rain in WEBSTER, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 06:00:00 (CST-6)
Location: BADGER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Rainfall of 2.41 inches reported in the past hour.  Power outages reported.

Heavy Rain in POLK, IOWA
From 23-AUG-14 06:59:00 to 23-AUG-14 06:59:00 (CST-6)
Location: RIDER
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall during the past 24 hours was 2.20 inches.

Heavy Rain in MADISON, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 06:00:00 (CST-6)
Location: WINTERSET
Property damage: 0.00K
Crop damage: 0.00K
Reported by: CoCoRaHS

Rainfall during the past 24 hours was 2.35 inches.

Heavy Rain in CLARKE, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 06:00:00 (CST-6)
Location: OSCEOLA MUNI ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Rainfall during the past 24 hours was 3.49 inches.

Heavy Rain in CLARKE, IOWA
From 23-AUG-14 08:10:00 to 23-AUG-14 08:10:00 (CST-6)
Location: OSCEOLA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall of 3.75 inches in the past 24 hours, 1.25 in the past 12 hours.

Heavy Rain in HANCOCK, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 06:00:00 (CST-6)
Location: KANAWHA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall of 1.6 inches in the past 24 hours.

Heavy Rain in CLARKE, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 06:00:00 (CST-6)
Location: OSCEOLA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall during the past 24 hours was 3.6 inches.

Heavy Rain in WARREN, IOWA
From 23-AUG-14 07:59:00 to 23-AUG-14 07:59:00 (CST-6)
Location: INDIANOLA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall of 2.45 inches in the past 24 hours.

Heavy Rain in APPANOOSE, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 06:00:00 (CST-6)
Location: DARBYVILLE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall during the past 24 hours was 1.55 inches.

Heavy Rain in MADISON, IOWA
From 23-AUG-14 08:43:00 to 23-AUG-14 08:43:00 (CST-6)
Location: EAST PERU
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall of 2.60 inches in the past 24 hours.

Heavy Rain in POLK, IOWA
From 23-AUG-14 10:11:00 to 23-AUG-14 10:11:00 (CST-6)
Location: URBANDALE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Rainfall of 1.6 inches in the past 24 hours.

Flash Flood in LUCAS, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 10:00:00 (CST-6)
Location: WILLIAMSON
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water running over the road.

Heavy Rain in CERRO GORDO, IOWA
From 23-AUG-14 07:31:00 to 23-AUG-14 07:31:00 (CST-6)
Location: (MCW)MASON CITY MUNI
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Rainfall of 1.50 inches in the past 30 minutes.

Heavy Rain in MARSHALL, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 06:00:00 (CST-6)
Location: MARSHALLTOWN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall during the past 24 hours was 1.64 inches.

Flash Flood in CLARKE, IOWA
From 23-AUG-14 06:11:00 to 23-AUG-14 11:15:00 (CST-6)
Location: MURRAY
Flood cause: Heavy Rain
Property damage: 250.00K
Crop damage: 0.00K
Reported by: Law Enforcement

The Clarke County dispatch said several roads and Highways were impassable.  Water was covering the roads near the bridge south of Osceola on U.S. Highway 69.

Heavy Rain in MONROE, IOWA
From 23-AUG-14 06:00:00 to 23-AUG-14 06:00:00 (CST-6)
Location: MAXON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall during the past 24 hours was 2.62 inches.

Heavy Rain in WARREN, IOWA
From 23-AUG-14 04:58:00 to 23-AUG-14 04:58:00 (CST-6)
Location: NEW VIRGINIA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Rainfall during the past 24 hours was 3.5 inches.

Heavy Rain in MONROE, IOWA
From 23-AUG-14 07:30:00 to 23-AUG-14 07:30:00 (CST-6)
Location: HOCKING
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Social Media

Rainfall during the past 12 hours was 4.38 inches.