This week’s image was taken this afternoon over Wisconsin
The satellite image shows a few thunderstorms firing along a frontal boundary running east to west through central Wisconsin. A few of these storms have overshooting tops, indicating the storms are quite strong. There is currently a Severe Thunderstorm Warning in place for one of these storms.
These storms appeared outside of any Storm Prediction Center (SPC) area. According to the morning upper-air soundings in the area, both Convective Available Potential Energy (CAPE) was low, and shear was weak. Even so, the passing frontal boundary caused storms to fire.
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Source: College of DuPage – Meteorology