The warm front from the previous night lifted north of the state as low pressure pushed northeast out of Kansas across northwest Iowa.  The atmosphere became quite unstable.  Lifted indices fell to -6 to -8, with CAPE values in the 1000 to 2000 J/kg range.  CAPE in the -10 to -30 C. layer of the atmosphere was between 200 and 500 J/kg.  Downdraft CAPE was in the 400 to 700 J/kg range.  The effective shear was between 35 and 55 kts.  The freezing level was consistent with what it had been the previous few events, at 11,900 feet.  Thunderstorms developed in several lines.  The main issue with the thunderstorms was heavy rain as precipitable water values were around 1.6 inches.  The 850 mb feed into the system was between 45 and 55 kts.  Spotty reports of severe wind were received along the line with some relatively minor damage.  Some farm outbuilding damage occurred with the high winds and a few trees were blown over.  The roof and siding were both damaged on a house at Sun Valley Lake in Ringgold County as a brief tornado touched down there.  Part of the roof was actually removed by 80 MPH straight line winds.  Many of the storms produced hail, however it remained below severe limits.  Flooding was widespread with flash flooding reported in several counties.  Rainfall of 4 to 7 inches occurred in a few areas, especially in Guthrie and Audubon Counties.  A band widespread 2 to 4 inch rainfall extended all the way across the CWA from the southwest corner to the northeast in the Waterloo area.   Some of the heavier totals included 8.5 inches in Waterloo, 7.4 inches in Hudson, both in Black Hawk County, and 7 inches in Hardin County in the Whitten area.  Numerous reports of 24 to 36 hour rainfall totals were received. They ranged from 3 1/4 to over 8 inches.  As the thunderstorms were moving east of the area, lightning struck a house in Altoona setting it on fire.  The house was severely damaged.  Nobody was home at the time, however fire fighters were able to save the family dog.

Flash Flood in GUTHRIE, IOWA
From 26-APR-09 16:05:00 to 26-APR-09 21:30:00 (CST-6)
Location: GUTHRIE CENTER
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Water reported over Highway 25 in Guthrie Center.

Flash Flood in GUTHRIE, IOWA
From 26-APR-09 16:05:00 to 26-APR-09 21:30:00 (CST-6)
Location: GUTHRIE CENTER
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Water was over Highway 25 just south of Guthrie Center.

Flash Flood in GUTHRIE, IOWA
From 26-APR-09 16:05:00 to 26-APR-09 21:30:00 (CST-6)
Location: PANORA
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Water reported over 195th Street.

Flash Flood in ADAIR, IOWA
From 26-APR-09 16:40:00 to 26-APR-09 21:30:00 (CST-6)
Location: ADAIR
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Water reported over the road at 140th St and Delta Ave.

Flash Flood in GUTHRIE, IOWA
From 26-APR-09 17:00:00 to 26-APR-09 21:30:00 (CST-6)
Location: FANSLERS
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Water was over the road in several places between Jamaica and Yale.

Flash Flood in MARSHALL, IOWA
From 26-APR-09 17:42:00 to 26-APR-09 23:00:00 (CST-6)
Location: MARSHALLTOWN ARPT
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Chicken Creek had risen out of its banks.

Flash Flood in GUTHRIE, IOWA
From 26-APR-09 17:44:00 to 26-APR-09 21:30:00 (CST-6)
Location: NORTH BRANCH
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flash flooding resulted in the collapse of a culvert at Frontier Rd and 292nd St.

Flash Flood in BLACK HAWK, IOWA
From 26-APR-09 18:23:00 to 26-APR-09 21:00:00 (CST-6)
Location: WATERLOO
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Flooding has popped up manhole covers on Upton Ave near Ansborough Ave.

Flash Flood in MARSHALL, IOWA
From 26-APR-09 19:03:00 to 26-APR-09 23:00:00 (CST-6)
Location: MARSHALLTOWN
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Water over Garwin Rd. near the intersection with Iowa Highway 14.

Flash Flood in BLACK HAWK, IOWA
From 26-APR-09 20:03:00 to 26-APR-09 20:03:00 (CST-6)
Location: WATERLOO RANCH ARPT
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Pleasant Creek was was out of its banks at Raymond Rd and E. Donald and rising.  Four inches of rain fell today on top of the 1 inch Saturday.

Flash Flood in BLACK HAWK, IOWA
From 26-APR-09 14:57:00 to 26-APR-09 21:00:00 (CST-6)
Location: WATERLOO
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Reports of 18 to 24 inches of flowing water through the intersection.

Flash Flood in GUTHRIE, IOWA
From 26-APR-09 16:40:00 to 26-APR-09 21:30:00 (CST-6)
Location: ADAIR
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Water reported over White Pole Rd.

Thunderstorm Wind in WARREN, IOWA
From 26-APR-09 17:43:00 to 26-APR-09 17:43:00 (CST-6)
Location: MILO
Magnitude: 52.00 EG
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Broadcast Media

One and one half foot diameter trees downed.

Thunderstorm Wind in LUCAS, IOWA
From 26-APR-09 17:52:00 to 26-APR-09 17:52:00 (CST-6)
Location: CHARITON MUNI ARPT
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in LUCAS, IOWA
From 26-APR-09 17:56:00 to 26-APR-09 17:56:00 (CST-6)
Location: CHARITON MUNI ARPT
Magnitude: 54.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: AWOS

Thunderstorm Wind in LUCAS, IOWA
From 26-APR-09 17:56:00 to 26-APR-09 17:56:00 (CST-6)
Location: CHARITON MUNI ARPT
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A 30 foot section of a trailer was blown by strong winds.

Heavy Rain in TAMA, IOWA
From 25-APR-09 07:54:00 to 27-APR-09 07:54:00 (CST-6)
Location: TRAER MUNI ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Weekend total of 7.40 inches.

Heavy Rain in ADAIR, IOWA
From 25-APR-09 08:00:00 to 27-APR-09 08:00:00 (CST-6)
Location: ADAIR
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Weekend total of 4.11 inches.

Heavy Rain in HARDIN, IOWA
From 26-APR-09 09:00:00 to 27-APR-09 09:00:00 (CST-6)
Location: WHITTEN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Rainfall of 7 inches in past 24 hours.

Lightning in POLK, IOWA
From 27-APR-09 00:30:00 to 27-APR-09 00:30:00 (CST-6)
Location: IVY
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Thunderstorm Wind in MARION, IOWA
From 26-APR-09 18:00:00 to 26-APR-09 18:00:00 (CST-6)
Location: NEPAS
Magnitude: 56.00 EG
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

A large tree was blown into a power pole and another power pole was downed.

Thunderstorm Wind in MARION, IOWA
From 26-APR-09 18:32:00 to 26-APR-09 18:32:00 (CST-6)
Location: PELLA
Magnitude: 53.00 MG
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Mesonet

Heavy Rain in GUTHRIE, IOWA
From 26-APR-09 08:00:00 to 26-APR-09 20:51:00 (CST-6)
Location: GUTHRIE CENTER
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Five inches of rain fell since 0800 CST with water coming into the basement on all 4 sides.

Flash Flood in GUTHRIE, IOWA
From 26-APR-09 18:40:00 to 26-APR-09 18:40:00 (CST-6)
Location: HERNDON
Flood cause: Heavy Rain
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Water was reported over roads in the county.

Flash Flood in GUTHRIE, IOWA
From 26-APR-09 18:40:00 to 26-APR-09 21:30:00 (CST-6)
Location: JAMAICA
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Water was reported over the roads.

Flash Flood in GUTHRIE, IOWA
From 26-APR-09 18:40:00 to 26-APR-09 21:30:00 (CST-6)
Location: BAGLEY
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flash Flood in MARSHALL, IOWA
From 26-APR-09 17:42:00 to 26-APR-09 23:00:00 (CST-6)
Location: MARSHALLTOWN
Flood cause: Heavy Rain
Property damage: 15.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Water was reported as waist deep on Linn St and Church St in Marshalltown.

Flash Flood in MARSHALL, IOWA
From 26-APR-09 19:03:00 to 26-APR-09 23:00:00 (CST-6)
Location: MARSHALLTOWN
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Water was over the northbound lanes of Iowa Highway 14.

Flash Flood in GUTHRIE, IOWA
From 26-APR-09 16:50:00 to 26-APR-09 21:30:00 (CST-6)
Location: MONTEITH
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Department of Highways

Iowa Highway 25 was closed due to water over the road.

Heavy Rain in TAMA, IOWA
From 25-APR-09 05:40:00 to 27-APR-09 05:40:00 (CST-6)
Location: GLADBROOK
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Weekend total.

Heavy Rain in POLK, IOWA
From 25-APR-09 05:30:00 to 27-APR-09 05:30:00 (CST-6)
Location: ALTOONA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Total from Saturday through Monday morning, 1.24 inches from Sunday night into Monday morning.

Heavy Rain in POLK, IOWA
From 25-APR-09 18:00:00 to 27-APR-09 05:45:00 (CST-6)
Location: LOVINGTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Newspaper

From the Des Moines Register.  Total from Saturday night through Monday morning.

Heavy Rain in MARSHALL, IOWA
From 26-APR-09 06:00:00 to 27-APR-09 06:00:00 (CST-6)
Location: MARSHALLTOWN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Total since 0600 CST Sunday.

Heavy Rain in MARSHALL, IOWA
From 26-APR-09 06:00:00 to 27-APR-09 06:00:00 (CST-6)
Location: MARSHALLTOWN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

Total since 0600 CST Sunday, 4.03 inches.

Heavy Rain in GUTHRIE, IOWA
From 26-APR-09 06:00:00 to 27-APR-09 06:00:00 (CST-6)
Location: JAMAICA
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Rainfall of 4.66 inches in past 25 hours.

Heavy Rain in JASPER, IOWA
From 26-APR-09 18:00:00 to 27-APR-09 06:25:00 (CST-6)
Location: NEWTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Total of 4.30 inches since Saturday afternoon.

Heavy Rain in BLACK HAWK, IOWA
From 25-APR-09 07:30:00 to 27-APR-09 07:30:00 (CST-6)
Location: DUNKERTON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Weekend total.

Heavy Rain in BLACK HAWK, IOWA
From 25-APR-09 07:30:00 to 27-APR-09 07:30:00 (CST-6)
Location: HUDSON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Heavy Rain in BLACK HAWK, IOWA
From 26-APR-09 07:30:00 to 27-APR-09 07:30:00 (CST-6)
Location: HUDSON
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Weekend total of 5 inches, 4.25 in past 24 hours.

Heavy Rain in BOONE, IOWA
From 26-APR-09 07:30:00 to 27-APR-09 07:30:00 (CST-6)
Location: BOONE MUNI ARPT
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Weekend total of 4.02 inches, with 3.47 in the past 24 hours.

Heavy Rain in STORY, IOWA
From 26-APR-09 07:30:00 to 27-APR-09 07:30:00 (CST-6)
Location: ONTARIO
Property damage: 0.00K
Crop damage: 0.00K
Reported by: NWS Employee

Weekend total of 3.26 inches, with 2.86 inches in past 24 hours.

Heavy Rain in DALLAS, IOWA
From 26-APR-09 06:00:00 to 27-APR-09 06:00:00 (CST-6)
Location: PERRY
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall of 3.40 inches in past 24 hours.

Heavy Rain in GRUNDY, IOWA
From 26-APR-09 06:00:00 to 27-APR-09 06:00:00 (CST-6)
Location: CONRAD
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall of 3.51 inches in past 24 hours.

Heavy Rain in TAMA, IOWA
From 26-APR-09 06:00:00 to 27-APR-09 06:00:00 (CST-6)
Location: GARWIN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall of 3.62 inches in past 24 hours.

Heavy Rain in BOONE, IOWA
From 26-APR-09 07:00:00 to 27-APR-09 07:00:00 (CST-6)
Location: BOONE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: COOP Observer

Rainfall of 3.18 inches in past 24 hours.

Flood in MARION, IOWA
From 27-APR-09 02:00:00 to 28-APR-09 08:00:00 (CST-6)
Location: MELCHER
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding was reported along English Creek between 80th and 90th Ave. on Utah St., and between Utah St. and Vermont St. on 78th Ave.

Flood in MARION, IOWA
From 27-APR-09 02:00:00 to 28-APR-09 08:00:00 (CST-6)
Location: KNOXVILLE ARPT
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding was reported along English Creek on 108th Place between Pierce and Perry streets, and on 130th Place between Oregon St. and Highway 14.

Flood in MARION, IOWA
From 27-APR-09 02:00:00 to 28-APR-09 08:00:00 (CST-6)
Location: OTLEY
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Flooding was reported along 200th between Beardsley and County Line Road, and on County Line Road between 190th and 200th.

Flood in LUCAS, IOWA
From 27-APR-09 02:00:00 to 28-APR-09 04:00:00 (CST-6)
Location: LUCAS
Flood cause: Heavy Rain
Property damage: 20.00K
Crop damage: 0.00K
Reported by: Department of Highways

Highway 65 at Highway 34 was closed in both directions near Lucas because of flooding.

Thunderstorm Wind in RINGGOLD, IOWA
From 26-APR-09 17:05:00 to 26-APR-09 17:05:00 (CST-6)
Location: BENTON
Magnitude: 56.00 EG
Property damage: 30.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A roof was blown off of a barn near 215th St and 190th Ave.  Numerous tree limbs were down.

Tornado in RINGGOLD, IOWA
From 26-APR-09 17:08:00 to 26-APR-09 17:10:00 (CST-6)
Location: ELLSTON
Tornado F-scale: EF0
Property damage: 100.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Brief tornado about 1.25 miles long. Track about 30 miles wide. The EF0 rating was based on pictures and coordination with the Emergency Manager.

Thunderstorm Wind in MARSHALL, IOWA
From 26-APR-09 17:13:00 to 26-APR-09 17:13:00 (CST-6)
Location: BEAMAN
Magnitude: 56.00 EG
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Outbuilding damage 2.19 miles south of Beaman.

Heavy Rain in GRUNDY, IOWA
From 26-APR-09 05:40:00 to 27-APR-09 05:40:00 (CST-6)
Location: REINBECK
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Broadcast Media

Weekend total.