After a stormy morning brought weather alerts to several Chicago-area counties, leaving dozens of flights canceled and sparking a ground stop at the region's largest airport, the threat for severe weather isn't over yet.
Another round of strong-to-severe storms could rapidly develop heading into the afternoon hours.
Moving into the afternoon and evening, a cold front is expected to inch into the region, which could spark another line of storms for some, according to the NBC 5 Storm Team.
The storms are expected to spark between the late afternoon and early evening hours, continuing through the night and into the overnight hours.
"Most of the activity will start to shift a little bit farther south overnight into early Wednesday morning," NBC 5 Storm Team Meteorologist Iisha Scott said.
By 5:15 p.m., LaSalle County was placed under a severe thunderstorm watch, which remains in effect until midnight.
According to the Storm Prediction Center, counties to the north Tuesday were at a "marginal" risk of severe weather, which ranks as level one of five on the SPC's five-level scale. The rest of the Chicago area Tuesday was under a "slight" risk of severe weather, which ranked as level two.
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The National Weather Service said storms that do develop along the line are "likely" to become severe, bringing threats of damaging wind, hail and heavy rainfall.
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Severe thunderstorm watches and warnings took effect early Tuesday across the Chicago area as a fast-moving line of storms brought heavy downpours, lightning, hail and thunder.
MORE: Live weather radar map
In advance of the weather, Chicago's Metropolitan Water Reclamation District issued an “Overflow Action Day” alert, advising Chicago-area residents to use less water in an effort to prevent overflowing of storm water management systems in the region.
Tuesday will also be a hot and humid day with muggier conditions, Roman said. Dew points in the 60s and 70s were expected, along with temperatures in the 80s to mid-90s.
According to Scott, heat index levels Tuesday could reach above 100 in some locations.
