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A slow-moving cold front coupled with unseasonably abundant atmospheric moisture from the Gulf of Mexico provided the impetus for a prolonged heavy rainfall event over southern Wisconsin. Storm total rainfall amounts over the area generally ranged from 2-5 inches, with locally higher amounts reported in some spots.

Additionally, severe weather moved across the area the evening of October 1st, causing damage in the areas of Belleville, Fort Atkinson, Blanchardville, and south of Sullivan through the Genesee Depot area. The following is an overview of these events.


Severe Weather and Storm Damage

After the first round of storms, sufficient clearing allowed for thunderstorm redevelopment. The second round of storms initiated around the 4 to 5 pm time frame and expanded in coverage through the evening. There was enough instability and shear available for storms to become severe with the potential for damaging winds, hail, and tornadoes. As the line of storms developed and moved eastward a few periods of gusty winds and a couple areas of rotation developed. There are currently two confirmed tornadoes from the evening on October 1st. More information can be found below.


Rain began across southern Wisconsin during the early morning hours on Tuesday, October,1st becoming heavy at times. This led to morning rainfall totals in the 1-2 inch range with locally higher amounts, especially across Fond du Lac, Sheboygan, Columbia and Dodge counties. This initial round of storms cleared out and allowed for peaks of sun for some in the afternoon. As a result, the atmosphere destabilized throughout the afternoon and additional thunderstorms developed into the evening. This second punch of rain proved more potent and widespread than the morning round, providing an additional 2-3+ inches during the overnight hours into Wednesday, October 2nd.


Radar reflectivity loop from early Tuesday morning through Wednesday morning.

Storm total accumulations (inches) from 8 AM, Sept. 30 through 8 AM, Oct. 2


Hydrographs - See our hydrograph website for the latest information across all of southern Wisconsin.

Many rivers are already or forecast to be in minor or moderate flood stage.


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