A similar situation to what was in place on the early morning of the 19th took place during the afternoon and overnight of the the 19th into the 20th.  In fact, the thunderstorm activity didn't really end between the two events.  A stationary front remained in place from northwest into east central Iowa.  Very humid air fed into the state as the moisture from the remains of tropical storm Erin continued to flow into the state.  In addition, as Erin progresses northeastward across Missouri, a tropical feed developed from the tropics south of California northeast into western Iowa.  Precipitable water values were high in the two to two and one half inch range.  Thunderstorms intensified during the late afternoon into the evening hours.  There was one downburst that took place early on in the event in Mason City.  The roof and exterior of a business was damaged there.  The real story was heavy rainfall.  Rainfall rates of two to as much as three and one half inches per hour were reported.  The heaviest rainfall occurred over northern Boone into Webster Counties.  There were numerous reports of 4 to 6 inches of rain from these areas.  Soil conditions across northern Iowa were very wet.  As a result, much of the rain that fell ran off and caused flash flooding.  Numerous reports of road closures and washouts were received.  Water was reported door high in Clear Lake in Cerro Gordo County.  Roads, both hard surface and gravel, were reported washed out northwest of Boone.  In Webster County, both U.S. Highway 169 and U.S. highway 20 were closed by high water.

Heavy Rain in CERRO GORDO, IOWA
From 19-AUG-07 15:32:00 to 19-AUG-07 15:57:00 (CST-6)
Location: CLEAR LAKE
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Heavy rainfall in a 25 minute time period caused some local flooding.

Flash Flood in BLACK HAWK, IOWA
From 19-AUG-07 19:24:00 to 19-AUG-07 23:00:00 (CST-6)
Location: WATERLOO RANCH ARPT
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Street flooding was reported with basements flooded from rising creek levels and heavy rain.

Heavy Rain in BOONE, IOWA
From 19-AUG-07 18:38:00 to 19-AUG-07 20:08:00 (CST-6)
Location: PILOT MOUND
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

A NWS trained spotter reports 3.75 inches of rain in 1.5 hours.

Heavy Rain in MARSHALL, IOWA
From 19-AUG-07 19:29:00 to 19-AUG-07 20:14:00 (CST-6)
Location: MARSHALLTOWN
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Public

Local flooding was caused by heavy rain that fell in a 45 minute time period.

Heavy Rain in HAMILTON, IOWA
From 19-AUG-07 18:28:00 to 19-AUG-07 19:08:00 (CST-6)
Location: JEWELL
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Fire Department/Rescue

A very heavy rainfall in 40 minutes caused local flooding.

Heavy Rain in BOONE, IOWA
From 19-AUG-07 19:00:00 to 19-AUG-07 20:00:00 (CST-6)
Location: PILOT MOUND
Property damage: 0.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Local flooding was caused by very heavy rain that fell in 1 hour.

Flash Flood in WEBSTER, IOWA
From 20-AUG-07 02:17:00 to 20-AUG-07 04:45:00 (CST-6)
Location: ROELYN
Flood cause: Heavy Rain
Property damage: 10.00K
Crop damage: 0.00K
Reported by: Law Enforcement

A car was stranded in water at the underpass along highway 20.

Flash Flood in CERRO GORDO, IOWA
From 19-AUG-07 16:57:00 to 19-AUG-07 18:30:00 (CST-6)
Location: CENTRAL HGTS
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 15.00K
Reported by: Trained Spotter

Standing water, estimated in excess of three feet, was covering side roads near HWY 122 and Eisenhower on the northwest side of town. Numerous ditches were full of water.

Flash Flood in WEBSTER, IOWA
From 20-AUG-07 02:35:00 to 20-AUG-07 04:45:00 (CST-6)
Location: (FOD)FT DODGE MUNI A
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Public

The Des Moines River was reported out of its banks, flooding a trail in  Fort Dodge.

Flash Flood in BLACK HAWK, IOWA
From 19-AUG-07 17:00:00 to 19-AUG-07 23:00:00 (CST-6)
Location: WATERLOO RANCH ARPT
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Water up to one foot deep was reported flowing over roads between Waterloo and Dunkerton.  Specific locations were Independence Ave and Raymond Road, and also Donald Street east of Raymond Road.

Flash Flood in BOONE, IOWA
From 19-AUG-07 21:35:00 to 20-AUG-07 02:45:00 (CST-6)
Location: WOLF
Flood cause: Heavy Rain
Property damage: 75.00K
Crop damage: 15.00K
Reported by: Law Enforcement

Several gravel and hard top roads were closed over northern Boone county, mainly northwest of Boone.

Flash Flood in BLACK HAWK, IOWA
From 19-AUG-07 16:40:00 to 19-AUG-07 23:00:00 (CST-6)
Location: DUNKERTON
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 10.00K
Reported by: Law Enforcement

Roads were washed out in the 3400 block of North Pilot Grove near Dunkerton.

Flash Flood in HAMILTON, IOWA
From 19-AUG-07 19:06:00 to 19-AUG-07 20:00:00 (CST-6)
Location: JEWELL
Flood cause: Heavy Rain
Property damage: 5.00K
Crop damage: 0.00K
Reported by: Amateur Radio

Six inches of running water was reported on the town streets and parking lots.

Flash Flood in FRANKLIN, IOWA
From 19-AUG-07 18:00:00 to 20-AUG-07 02:34:00 (CST-6)
Location: HAMPTON MUNI ARPT
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 10.00K
Reported by: Law Enforcement

The Hampton police department reported roadways under water at 1800CST with 2 to 3 feet of water at the 800 to 900 block of Forest Street, or Highway 65 on the north side of the city.

Flash Flood in BLACK HAWK, IOWA
From 19-AUG-07 16:42:00 to 19-AUG-07 23:00:00 (CST-6)
Location: DUNKERTON
Flood cause: Heavy Rain
Property damage: 100.00K
Crop damage: 10.00K
Reported by: Law Enforcement

A bridge was washed out in the 7700 block of East Big Rock Road near Dunkerton.

Flash Flood in WEBSTER, IOWA
From 20-AUG-07 02:00:00 to 20-AUG-07 04:45:00 (CST-6)
Location: TARA
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 10.00K
Reported by: Emergency Manager

Blacktop county road P41 was reported as washed out 2 miles north of  Highway 7 around 0200CST.

Flash Flood in WEBSTER, IOWA
From 20-AUG-07 00:39:00 to 20-AUG-07 04:45:00 (CST-6)
Location: FT DODGE
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 10.00K
Reported by: Law Enforcement

Highway 169 south of Fort Dodge was reported as impassable.

Flash Flood in CALHOUN, IOWA
From 20-AUG-07 02:17:00 to 20-AUG-07 05:15:00 (CST-6)
Location: MANSON
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Highway 7 was closed east of Manson due to water over the road. All roads in Manson were flooded. Water was over the road at 330th and P21.

Flash Flood in FRANKLIN, IOWA
From 19-AUG-07 19:49:00 to 20-AUG-07 02:34:00 (CST-6)
Location: BRADFORD
Flood cause: Heavy Rain
Property damage: 75.00K
Crop damage: 15.00K
Reported by: Law Enforcement

Several county gravel roads were completely or partially washed out. Roads mainly affected were south of 105th Street and in the area of Raven and 40th Street.

Flash Flood in CERRO GORDO, IOWA
From 19-AUG-07 16:19:00 to 19-AUG-07 18:30:00 (CST-6)
Location: CLEAR LAKE
Flood cause: Heavy Rain
Property damage: 75.00K
Crop damage: 0.00K
Reported by: Law Enforcement

Water was reported to be door high on North Shore Drive in the 2700 block.

Flash Flood in CALHOUN, IOWA
From 20-AUG-07 01:15:00 to 20-AUG-07 05:15:00 (CST-6)
Location: FARNHAMVILLE
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 5.00K
Reported by: Law Enforcement

Streets were reported as impassable with water over the roads south of  Farnhamville at 370th and Highway P21.

Flash Flood in WEBSTER, IOWA
From 20-AUG-07 02:53:00 to 20-AUG-07 04:45:00 (CST-6)
Location: CLARE
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 5.00K
Reported by: Emergency Manager

Lizard Creek was reported as flooding with roads flooded near Barnum. Highway 169 and 20 intersection was closed due to water over the road. Numerous roads in Fort Dodge were under water.

Flash Flood in WRIGHT, IOWA
From 19-AUG-07 17:30:00 to 20-AUG-07 02:10:00 (CST-6)
Location: EAGLE GROVE
Flood cause: Heavy Rain
Property damage: 30.00K
Crop damage: 5.00K
Reported by: Law Enforcement

Law Enforcement reported basement flooding in two residences.  The occupants were rescued from a stalled car in 3 feet of water at Lucas and northeast 2nd Street. One to two feet of water was reported at the 700 block of north Iowa Ave in Eagle Grove.  Street flooding was reported and street barricades were placed.

Flash Flood in WEBSTER, IOWA
From 19-AUG-07 22:50:00 to 20-AUG-07 04:45:00 (CST-6)
Location: CLARE
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 5.00K
Reported by: Law Enforcement

Water was reported over the road on Highway C66 between Highway 169  and Clare. Emergency personnel had trouble getting around Fort Dodge due to flooded roads.

Flash Flood in CALHOUN, IOWA
From 20-AUG-07 05:00:00 to 20-AUG-07 06:30:00 (CST-6)
Location: KNIERIM
Flood cause: Heavy Rain
Property damage: 25.00K
Crop damage: 10.00K
Reported by: Trained Spotter

Water was reported over blacktop county road, making it impassable via semi at 2 to 3 places between Knierim and Twin Lakes.

Thunderstorm Wind in CERRO GORDO, IOWA
From 19-AUG-07 16:07:00 to 19-AUG-07 16:07:00 (CST-6)
Location: MASON CITY
Magnitude: 70.00 EG
Property damage: 40.00K
Crop damage: 0.00K
Reported by: Trained Spotter

Damage to numerous signs and other buildings around the intersection of hwy 122 and Monroe Ave.  Damage done to the roof and exterior of a business at the intersection of hwy 122 and South Monroe.