Severe storms prompt Tornado Watch in Illinois and Wisconsin.

Severe Thunderstorm Warnings and a Tornado Watch have been issued for several counties in the Chicago area due to a round of storms producing large hail and high winds. The greatest tornado risk is posed by discrete supercell thunderstorms that will develop into a line of storms, with the main threat transitioning to high winds. The immediate Chicago area has a 2% risk of a tornado developing within 25 miles, with a large swath of the northwest, western and southwest suburbs under a 5% risk. The forecast for Friday is expected to be better, with highs in the mid-60s with stray showers possible.