Microburst affected Farmersville-Knowles area in Dodge County on May 13th

At about 945 to 955 pm a small downburst, meteorologically known as a microburst, affected a 2 mile swath from just southwest of Farmersville to the Knowles area in northeast Dodge County.  This intense microburst probably generated maximum wind gusts in the 75 to 100 mph range, based on a preliminary storm survey conducted by three National Weather Service meteorologists.  The damage swath ranged from 50 to 75 yards in width.

There were no fatalities or injuries, but at least 7 cows were killed in a barn that was destroyed.  Otherwise, at least another half-dozen pole sheds or storage sheds were damaged or destroyed, and at least a couple homes sustained minor damage.  An estimated 100 to 150 trees were damaged or pushed over and  a couple road signs were damaged.  The majority of the damage was across Farmersville.

The damage survey indicated that most damaged trees west of County Highway V were pointing toward the northwest to west direction, while most of the damaged trees and debris east of CTH V were pointing toward the northeast.  This splaying damage pattern is very typical of downburst damage patterns.  On the other hand, tornado damage patterns would have converging lines of debris and damaged trees pointing in completely opposite directions on either side of axis of tornado path.  The survey team did not see damage patterns that would support the tornado idea.

Damage survey team members - Rusty Kapela, Penny Zabel, and Chris Kuhlman, with help from Todd Nehis (Dodge County Sheriff), and Paul Kohlman (Severe Weather Spotter).

Below is a reflectivity radar image at about 950 pm showing a line of storms moving west to east across southern Wisconsin.  Note that in northeast Dodge County a small segment of the line had bowed out to the northeast - that is accelerated (arrow points to the bowing-out segment).  This would indicate that a downburst/microburst occurred.

line fo storms

Small horse shed displaced and destroyed 1/4 mile southwest of Farmersville...

Four pine trees uprooted on the southwest corner of Hwy V and Farmersville Rd intersection...

Tree uprooted and another snapped in half on the northwest corner of Hwy V and Farmersville Rd intersection...

Roof and window damage to house and tree damage on the northeast corner of Hwy V and Farmersville Rd intersection...

Two pole barns destroyed just northeast of Hwy V and Farmersville Rd intersection...



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