Storm Events Database

Event Details

Event Flash Flood
-- Flood Cause Heavy Rain
State WISCONSIN
County/Area COLUMBIA
WFO MKX
Begin Date 07/22/2010 16:00:00 CST-6
Begin Range 4
Begin Azimuth WSW
Begin Location PORTAGE ARPT
Begin Lat/Lon 43.55/-89.54
End Date 07/22/2010 19:00:00 CST-6
End Range 3
End Azimuth ESE
End Location FRIESLAND
End Lat/Lon 43.56/-89.01
Deaths Direct/Indirect 0/0 (fatality details below, when available...)
Injuries Direct/Indirect 0/0
Property Damage 100.00K
Crop Damage 10.00K
Episode Narrative Parts of south-central and southeast Wisconsin experienced several rounds of record-setting torrential heavy rains during the afternoon and evening hours of July 22, 2010 that led to flash flooding and damage. During the afternoon, a persistent band of strong to severe thunderstorms developed and moved very slowly over south central and southeast Wisconsin through the evening hours. The individual storms were moving quite fast, about 40 to 50 mph, but the slow southward movement of the boundary these storms were developing along, resulted in storms repeatedly training, or moving, over the same area.

Widespread 3 to 4 inch amounts were reported along and either side of the I-94 corridor, with locally higher amounts of 5 to 8 inches. The greatest rain amounts fell in Milwaukee County. Mitchell Field recorded 5.61 inches for the day, breaking a record for the date. The previous record was 1.26 set in 1948. This also is the second highest daily rainfall total on record for Milwaukee. The greatest one-day precipitation record was the 6.81 inches which fell on August 6, 1986. Madison also set a record for precipitation for the date at 3.62 inches. This beat the previous mark of 2.21 inches set in 1885. The 3.62 inches of rainfall ranks 13th for the most precipitation received in one day. The record is the 4.96 inches which fell on August 8, 1906.

About 32,000 We Energy utility customers lost electrical power throughout southeast Wisconsin due to the flooding and lightning.
Event Narrative Law enforcement officials reported numerous road closures and culverts damaged due to deep and rushing water over roads from near Portage to Randolph, and south to the Dane County border. Included in these reports was damage to culvert supports in the Harmony Grove subdivision and damage to roads shoulders and driveways along Cactus Acres Road in Lodi; knee-high water covering Henry Drive in Portage. Storm total rainfall reports include 3.68 inches in Lodi; 3.58 inches in Arlington; and 2.58 inches near the Wisconsin Dells, with much of the rain falling within one to two hours of time.


All events for this episode:

Location County/Zone St. Date Time T.Z. Type Mag Dth Inj PrD CrD
Totals: 1 0 27.600M 111.00K
PORTAGE ARPT COLUMBIA CO. WI 07/22/2010 16:00 CST-6 Flash Flood 0 0 100.00K 10.00K
STONE DANE CO. WI 07/22/2010 16:00 CST-6 Flash Flood 0 0 100.00K 10.00K
RANDOLPH DODGE CO. WI 07/22/2010 16:00 CST-6 Flash Flood 0 0 20.00K 5.00K
ST KILIAN WASHINGTON CO. WI 07/22/2010 16:30 CST-6 Flash Flood 0 0 20.00K 2.00K
SHEBOYGAN SHEBOYGAN CO. WI 07/22/2010 16:30 CST-6 Flash Flood 0 0 20.00K 2.00K
DANE DANE CO. WI 07/22/2010 17:00 CST-6 Flash Flood 0 0 150.00K 10.00K
FIVE CORNERS OZAUKEE CO. WI 07/22/2010 17:00 CST-6 Flash Flood 0 0 20.00K 1.00K
GRANVILLE MILWAUKEE CO. WI 07/22/2010 17:00 CST-6 Flash Flood 1 0 24.100M 10.00K
WATERTOWN JEFFERSON CO. WI 07/22/2010 18:00 CST-6 Flash Flood 0 0 150.00K 10.00K
HONEY LAKE RACINE CO. WI 07/22/2010 18:00 CST-6 Flash Flood 0 0 20.00K 1.00K
MENOMONEE FALLS WAUKESHA CO. WI 07/22/2010 18:00 CST-6 Flash Flood 0 0 2.900M 50.00K
Totals: 1 0 27.600M 111.00K