Sunday evening, a late-Spring storm system continued to generate severe thunderstorms from the southern Plains, to northwest Wisconsin. At latest count, 21 tornadoes were reported across Kansas, Oklahoma, and Iowa Sunday afternoon and evening. Many other areas were pummeled by large hailstones.
This weather system is expected to shift slowly eastward on Monday, spreading the threat of severe weather into the Chicago area.
Chicago will be on the eastern fringe of a large area of thunderstorm activity tonight. Most of the storms should stay west of the City of Chicago, impacting some west and northwest suburbs.
As temperatures soar to the upper 80s Monday afternoon, and dew points approach 70 degrees, the atmosphere will become primed for rapid thunderstorm development. Strong winds aloft are forecast to further increase the potential for damaging winds and hail. The storm prediction center has suggested that our severe weather threat will extend into Tuesday.