A major severe weather outbreak is forecast across the Midwest for Sunday.
The Storm Prediction Center (SPC) has indicated that there is a HIGH RISK of severe weather over eastern Illinois, mainly along and east of I-57, extending into much of central and western Indiana. A MODERATE RISK exists over much of the remainder of central Illinois.
A vigorous storm system will track into the Great Lakes by Sunday evening. As it does, it will drag a strong cold front into central Illinois by Sunday afternoon. The airmass ahead of the front will become unseasonably warm and humid, with temperatures soaring well into the 60s and dewpoints rising to around 60 degrees as well. Tremendous wind shear over the area, coupled with instability ahead of the front, will produce an atmosphere capable of producing damaging winds over 75 mph and strong, long-track tornadoes. The storms are expected to begin forming between I-55 and the Illinois River by midday, then race eastward. The storms should be out of much of central Illinois by 4 pm, but will continue in southeast Illinois until around 5 to 6 pm.
It has been several months since tornadoes have been observed in central Illinois, and with the fact this outbreak is outside the "normal" severe weather season, people may no longer be familiar with tornado safety rules. Take some time to reacquaint yourself with these rules, and be prepared to take shelter late this morning or this afternoon as these storms move through.