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Storm Events Database
Event Details
| Event | Thunderstorm Wind |
| Magnitude | 52 kts. |
| State | WISCONSIN |
| County/Area | OZAUKEE |
| WFO | MKX |
| Begin Date | 08/22/2007 16:15:00 CST-6 |
| Begin Range | 0 |
| Begin Azimuth | N |
| Begin Location | GRAFTON |
| Begin Lat/Lon | 43.32/-87.95 |
| End Date | 08/22/2007 16:25:00 CST-6 |
| End Range | 0 |
| End Azimuth | N |
| End Location | MEQUON |
| End Lat/Lon | 43.22/-87.98 |
| Deaths Direct/Indirect | 0/0 (fatality details below, when available...) |
| Injuries Direct/Indirect | 0/0 |
| Property Damage | 30.00K |
| Crop Damage | 0.00K |
| Episode Narrative | During the afternoon and evening hours of August 22nd, the second round of storms for the calendar day moved east across south-central and southeast Wisconsin. The clusters or short lines of storms moved east at a speed of about 30 knots (35 mph), and generated damaging downburst straight-line winds that toppled trees and power-lines, and heavy rains that triggered flash flooding. Synoptically, a stationary front stretched from northern Iowa to Wisconsin/Illinois border. Warm, moist, unstable air flowed north over the front in association with an upper-level short-wave trough, resulting in thunderstorm generation. Hourly rainfall rates peaked around 2 inches. By the end of August, 2007, many locations in south-central and southeast Wisconsin would establish new August rainfall records, and all-time/any month rainfall records. Many locations measured 10 to over 20 inches for the month of August, 2007, or about 200% to over 400% of normal. Normal August precipitation in southern Wisconsin is about 4 to 4.25 inches. Unofficially, about 25 inches fell at a location 2W of Barneveld, Iowa County. Specific August, 2007, monthly totals are listed in the various flash flood events of August 18-19th and August 22nd. |
| Event Narrative | Powerful thunderstorm wind gusts up to 52 knots (60 mph) toppled several large trees and damaged some power-lines. |
All events for this episode:
| Location | County/Zone | St. | Date | Time | T.Z. | Type | Mag | Dth | Inj | PrD | CrD |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Totals: | 0 | 0 | 2.430M | 4.300M | |||||||
| OCONOMOWOC | WAUKESHA CO. | WI | 08/22/2007 | 15:42 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 25.00K | 0.00K |
| HARTFORD | WASHINGTON CO. | WI | 08/22/2007 | 15:48 | CST-6 | Thunderstorm Wind | 56 kts. EG | 0 | 0 | 25.00K | 0.00K |
| ASHIPPUN | DODGE CO. | WI | 08/22/2007 | 15:55 | CST-6 | Thunderstorm Wind | 56 kts. MG | 0 | 0 | 25.00K | 0.00K |
| HARTFORD | WASHINGTON CO. | WI | 08/22/2007 | 15:57 | CST-6 | Thunderstorm Wind | 58 kts. MG | 0 | 0 | 25.00K | 0.00K |
| LAKE MILLS | JEFFERSON CO. | WI | 08/22/2007 | 16:00 | CST-6 | Flash Flood | 0 | 0 | 50.00K | 200.00K | |
| BEAVER DAM | DODGE CO. | WI | 08/22/2007 | 16:00 | CST-6 | Flash Flood | 0 | 0 | 100.00K | 200.00K | |
| SUSSEX | WAUKESHA CO. | WI | 08/22/2007 | 16:01 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 75.00K | 0.00K |
| HARTFORD | WASHINGTON CO. | WI | 08/22/2007 | 16:05 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 25.00K | 0.00K |
| WATERTOWN | DODGE CO. | WI | 08/22/2007 | 16:15 | CST-6 | Flash Flood | 0 | 0 | 200.00K | 400.00K | |
| GRAFTON | OZAUKEE CO. | WI | 08/22/2007 | 16:15 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 30.00K | 0.00K |
| BROWN DEER | MILWAUKEE CO. | WI | 08/22/2007 | 16:15 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 25.00K | 0.00K |
| DOWNTOWN MADISON | DANE CO. | WI | 08/22/2007 | 16:15 | CST-6 | Flash Flood | 0 | 0 | 50.00K | 200.00K | |
| HARTLAND | WAUKESHA CO. | WI | 08/22/2007 | 16:15 | CST-6 | Flash Flood | 0 | 0 | 100.00K | 200.00K | |
| GREENFIELD | MILWAUKEE CO. | WI | 08/22/2007 | 16:28 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 15.00K | 0.00K |
| HARTFORD | WASHINGTON CO. | WI | 08/22/2007 | 16:30 | CST-6 | Flash Flood | 0 | 0 | 100.00K | 500.00K | |
| MILWAUKEE TIMMERMAN AIRPORT | MILWAUKEE CO. | WI | 08/22/2007 | 16:31 | CST-6 | Thunderstorm Wind | 68 kts. MG | 0 | 0 | 25.00K | 0.00K |
| SHOREWOOD | MILWAUKEE CO. | WI | 08/22/2007 | 17:03 | CST-6 | Thunderstorm Wind | 56 kts. EG | 0 | 0 | 15.00K | 0.00K |
| MINERAL PT | IOWA CO. | WI | 08/22/2007 | 17:07 | CST-6 | Thunderstorm Wind | 56 kts. EG | 0 | 0 | 15.00K | 0.00K |
| JORDAN | GREEN CO. | WI | 08/22/2007 | 17:35 | CST-6 | Thunderstorm Wind | 52 kts. EG | 0 | 0 | 10.00K | 0.00K |
| MONTICELLO | GREEN CO. | WI | 08/22/2007 | 17:46 | CST-6 | Thunderstorm Wind | 56 kts. EG | 0 | 0 | 10.00K | 0.00K |
| NEW GLARUS | GREEN CO. | WI | 08/22/2007 | 17:48 | CST-6 | Thunderstorm Wind | 65 kts. EG | 0 | 0 | 10.00K | 0.00K |
| OREGON | DANE CO. | WI | 08/22/2007 | 18:00 | CST-6 | Flash Flood | 0 | 0 | 50.00K | 200.00K | |
| EVANSVILLE | ROCK CO. | WI | 08/22/2007 | 18:15 | CST-6 | Flash Flood | 0 | 0 | 500.00K | 500.00K | |
| WHITEWATER | WALWORTH CO. | WI | 08/22/2007 | 18:30 | CST-6 | Flash Flood | 0 | 0 | 150.00K | 200.00K | |
| STURTEVANT | RACINE CO. | WI | 08/22/2007 | 18:30 | CST-6 | Flash Flood | 0 | 0 | 100.00K | 100.00K | |
| MINERAL PT | IOWA CO. | WI | 08/22/2007 | 18:30 | CST-6 | Flash Flood | 0 | 0 | 100.00K | 100.00K | |
| WHEATLAND | KENOSHA CO. | WI | 08/22/2007 | 19:00 | CST-6 | Flash Flood | 0 | 0 | 100.00K | 300.00K | |
| BROWNTOWN | GREEN CO. | WI | 08/22/2007 | 19:00 | CST-6 | Flash Flood | 0 | 0 | 400.00K | 1.000M | |
| SHULLSBURG | LAFAYETTE CO. | WI | 08/22/2007 | 19:00 | CST-6 | Flash Flood | 0 | 0 | 50.00K | 200.00K | |
| PEWAUKEE | WAUKESHA CO. | WI | 08/22/2007 | 21:30 | CST-6 | Thunderstorm Wind | 56 kts. EG | 0 | 0 | 25.00K | 0.00K |
| Totals: | 0 | 0 | 2.430M | 4.300M |
