EF1 tornado in Marquette County, Wisconsin

This tornado started in Adams county and moved southeastward into Marquette county at the intersection of 1st Ave. and Glen Ave., and dissipated just north of STH 23, mid-way between 3rd Ave. and Neenah Creek. It resulted in minor damage to 4 residential homes, minor damage to 2 agricultural buildings, major damage to 2 agricultural buildings, and destroyed 1 agrcultural building. Total residential damage was about $100K and total agricultural damage was about $200K. Some corn crop was also damaged. The lat/long starting location in Marquette County was 43.68597/-89.59951, and the ending location was 43.66950/-89.56055. DI#1 (SBO), DOD6. Winds estimated at 100 mph. Average path width was about 50 yards.

A slow-moving surface boundary, nearly parallel with the mid-level flow affected southern Wisconsin during the period of June 7th through June 9th. A strengthening low-level jet and strong moisture advection produced several rounds of thunderstorms during the period in the vicinity of this boundary. The atmosphere was very moist with precipitable water values around 2 inches. Low to mid-level wind flow supported training of flood-producing thunderstorms. There was sufficient vertical wind shear to allow for supercell development that resulted in 10 tornadoes spinning up in south-central and southeast Wisconsin on June 7th. A weak cool front pushed through southern Wisconsin late on the 8th/early on the 9th, finally ending the heavy rainfall.

During the evening of June 7th, several roads near STH 89 south of Columbus were washed out. STH 16 east of Columbus closed on June 8th due to high waters. A state-of-emergency was declared in Milwaukee County the evening of June 7th due to widespread flash flooding, and Milwaukee Mitchell Field was close for several hours due to high water levels.