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Storm Events Database
Event Details
| Event | Flash Flood |
| -- Flood Cause | Heavy Rain |
| State | WISCONSIN |
| County/Area | OZAUKEE |
| WFO | MKX |
| Begin Date | 07/22/2010 17:00:00 CST-6 |
| Begin Range | 2 |
| Begin Azimuth | SSW |
| Begin Location | FIVE CORNERS |
| Begin Lat/Lon | 43.3/-88.02 |
| End Date | 07/22/2010 19:00:00 CST-6 |
| End Range | 2 |
| End Azimuth | ESE |
| End Location | GRAFTON |
| End Lat/Lon | 43.3/-87.91 |
| Deaths Direct/Indirect | 0/0 (fatality details below, when available...) |
| Injuries Direct/Indirect | 0/0 |
| Property Damage | 20.00K |
| Crop Damage | 1.00K |
| 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 | Police reported runoff from heavy rains caused a few sewer backups in homes causing damage to contents in Mequon. Police also reported water over roads in Cedarburg, draining with enough force to pop off a manhole cover near the high school. Law enforcement also closed I-43 at both Mequon Road and County Line Road, mainly due to impassable conditions due to flooding just over the county line in Milwaukee. Thiensville officials reported 2.85 inches of rain in less than 2 hours, while Mequon received 2.84 inches. |
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 | |
| SHEBOYGAN | SHEBOYGAN CO. | WI | 07/22/2010 | 16:30 | CST-6 | Flash Flood | 0 | 0 | 20.00K | 2.00K | |
| ST KILIAN | WASHINGTON CO. | WI | 07/22/2010 | 16:30 | CST-6 | Flash Flood | 0 | 0 | 20.00K | 2.00K | |
| GRANVILLE | MILWAUKEE CO. | WI | 07/22/2010 | 17:00 | CST-6 | Flash Flood | 1 | 0 | 24.100M | 10.00K | |
| 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 | |
| MENOMONEE FALLS | WAUKESHA CO. | WI | 07/22/2010 | 18:00 | CST-6 | Flash Flood | 0 | 0 | 2.900M | 50.00K | |
| 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 | |
| Totals: | 1 | 0 | 27.600M | 111.00K |
