Severe Thunderstorm Watch issued for southern Wisconsin until 2 a.m. Thursday July 28, 2021 7:35 PM Updated: MADISON, Wis. — A severe thunderstorm watch is now in effect for most of Wisconsin until 2 a.m. Thursday morning. The National Weather Service issued the watch a 7:15 p.m. Wednesday for several counties, including Adams, Columbia, Dane, Dodge, Green, Iowa, Jefferson, Juneau, Lafayette, Richland, Rock, Sauk, and Walworth Counties in southern Wisconsin.