Storm Events Database

Event Details

Event Thunderstorm Wind
Magnitude 52 kts.
State WISCONSIN
County/Area OZAUKEE
WFO MKX
Report Source Law Enforcement
NCDC Data Source CSV
Begin Date 2007-08-22 16:15:00.0 CST-6
Begin Location 0N GRAFTON
Begin Lat/Lon 43.32/-87.95
End Date 2007-08-22 16:25:00.0 CST-6
End Location 0N 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.


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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
BEAVER DAM DODGE CO. WI 08/22/2007 16:00 CST-6 Flash Flood 0 0 100.00K 200.00K
LAKE MILLS JEFFERSON CO. WI 08/22/2007 16:00 CST-6 Flash Flood 0 0 50.00K 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
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
GRAFTON OZAUKEE CO. WI 08/22/2007 16:15 CST-6 Thunderstorm Wind 52 kts. EG 0 0 30.00K 0.00K
HARTLAND WAUKESHA CO. WI 08/22/2007 16:15 CST-6 Flash Flood 0 0 100.00K 200.00K
WATERTOWN DODGE CO. WI 08/22/2007 16:15 CST-6 Flash Flood 0 0 200.00K 400.00K
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
MINERAL PT IOWA CO. WI 08/22/2007 18:30 CST-6 Flash Flood 0 0 100.00K 100.00K
STURTEVANT RACINE CO. WI 08/22/2007 18:30 CST-6 Flash Flood 0 0 100.00K 100.00K
WHITEWATER WALWORTH CO. WI 08/22/2007 18:30 CST-6 Flash Flood 0 0 150.00K 200.00K
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
WHEATLAND KENOSHA CO. WI 08/22/2007 19:00 CST-6 Flash Flood 0 0 100.00K 300.00K
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