Training of thunderstorms moving east/southeast through south-central and southeast Wisconsin overnight, resulted in isolated flash floods in the vicinity of Barvenveld, and some minor urban and small stream flooding elsewhere in Sauk, Dane, Rock, Green, and Lafayette counties.  The rain that fell in this episode nearly saturated the ground in these counties, and set the stage for future flash flooding during the periods of August 18-19, and August 22nd.  A rainfall graphic is attached to the Iowa County flash flood event for August 18-19th event in Iowa County.  Synoptically, a stalled surface front extended from central Iowa to northern Illinois.  Mid-level warm-air advection over the front set up a thunderstorm initiation zone that extended from southern Minnesota to south-central Wisconsin.  Refer to the August 18-19, and 22nd flash flood events for related information.

Heavy Rain in DANE, WISCONSIN
From 05-AUG-07 00:00:00 to 05-AUG-07 04:00:00 (CST-6)
Location: BLUE MOUNDS
Property damage: 20.00K
Crop damage: 0.00K
Reported by: COOP Observer

Training thunderstorms moved east-southeast across southwestern Dane County and dumped heavy rains overnight into the pre-dawn hours of August 5th.  Fortunatly the thunderstorms were spread out, otherwise this would have been a flash flood event.  Some basement flooding was noted due to drain-backups and sump pump failures, and these homes sustained water damage to contents.  Additionally, most small creeks or streams in southwestern Dane County reached bankfull or flood stage; although no problems or road closures were noted.  Specific rainfall totals include 8 at a location about 2.5 miles north-northwest of Daleyville, 6.2 about 3 miles northeast of Daleyville, 5.5 at a spotter's home 1 mile east of Mount Horeb, 5.25 at a location 1 mile southwest of Montrose and 5.0 in Blue Mounds and 2 miles southwest of Verona.  Refer to the Flash Flood event for Iowa County on August 5, 2007, for related details.

Heavy Rain in GREEN, WISCONSIN
From 05-AUG-07 00:00:00 to 05-AUG-07 04:00:00 (CST-6)
Location: BELLEVILLE
Property damage: 10.00K
Crop damage: 0.00K
Reported by: COOP Observer

Training thunderstorms moved east-southeast across northern Green County and dumped heavy rains overnight into the pre-dawn hours of August 5th.  Although there wasn't a flash flood event, some basement flooding was noted due to drain-backups and sump pump failures.  Consequently some basement contents sustained water damage.  Additionally, most small creeks or streams in northern Green County reached bankfull or flood stage; although no problems or road closures were noted.  Specific rainfall totals include 5.82 at a COCORAHS site about 2 miles east-southeast of Belleville, and 5.15 at a location 3 miles north of Monticello.  Refer to the Flash Flood event for Iowa County on August 5, 2007, for related details.

Flash Flood in IOWA, WISCONSIN
From 05-AUG-07 02:00:00 to 05-AUG-07 04:00:00 (CST-6)
Location: ARENA
Flood cause: Heavy Rain
Property damage: 50.00K
Crop damage: 0.00K
Reported by: Emergency Manager

Overnight rainfalls of 5 to over 10 inches in the Arena to Barneveld to Hollendale vicinity resulted in a low-end flash flood.  One significant mudslide occurred on CTH K about 2 miles northeast of Barneveld, and a second mudslide on CTH K about 2.5 miles south fo Barneveld. Soil erosion also occurred between Barneveld and about 4 miles northwest of Barneveld.  CTH K was reduced to only 1-lane traffic where the two mudslides occurred (mud and trees), and large front-end loaders were needed to clear the road.  Several homes had water in basements in and around Barneveld for the first time ever.  A farmer 2 miles west of Barneveld measured at least 10 inches of rain (he had to empty a 5-inch raingage twice and missed some rain).  A portion of Amacher Hollow Road in the rural portion of Area Township washed out when culverts filled up around Mill Creek.  Water depths on that road reached 3 to 5 feet.   Mill Creek also flowed over the bridge on Coon Rock Road near Demby Road.  Additionally, most rivers and streams in the eastern third of Iowa County reached bankfull or flood stage for at least a few hours overight.  The Wastewater Treatment Plant in Barneveld measured 9.75 inches.  Other overnight rainfall amounts include 8.98 at a UW-Madison research site on the upper East Branch Pecatonica River about 2.4 miles south-southeast of Barneveld, 8.13 about 1 mile northeast of Ridgeway, 6.92 about 4 miles north of Hollendale, 6 in Hollendale, and 3.61 about 4 miles north of Dodgeville.

Heavy Rain in ROCK, WISCONSIN
From 05-AUG-07 00:00:00 to 05-AUG-07 04:00:00 (CST-6)
Location: EVANSVILLE
Property damage: 10.00K
Crop damage: 0.00K
Reported by: COOP Observer

Training thunderstorms moved east-southeast across portions of Rock County and dumped heavy rains overnight into the pre-dawn hours of August 5th.  Although there wasn't a flash flood event, some basement flooding was noted due to drain-backups and sump pump failures.  Consequently some basement contents sustained water damage.  Additionally, many small creeks or streams in Rock County reached bankfull or flood stage; although no problems or road closures were noted.  Specific rainfall totals include 5.45 at a spotter's location 4.9 miles southeast of Janesville, 4.5 in Evansville, 4.22 at a co-op site in Afton, 3.72 at a co-op site in Clinton, and 3.45 in Milton.  Refer to the Flash Flood event for Iowa County on August 5, 2007, for related details.