Hail in Goodhue County, Minnesota

A southward moving cold front tracked across central and southern MN early Monday morning before stalling near Redwood Falls, MN over to Eau Claire, WI. Morning stratus associated with this frontal boundary aided an increased thermal gradient along this boundary. Later in the afternoon, a surface low centered over eastern Nebraska advected unstable air into much of southern MN. This airmass converged on the pre-existing stationary boundary which led to the initiation of several severe thunderstorms. Many thunderstorms produced large to very large hail measuring as large as 3.5 in diameter as well as four tornadoes across southern Minnesota.