Chicago Weather

Timeline: What to expect and when with severe weather threat Tuesday

Here's a timeline of Tuesday's potentially stormy forecast

Don't be fooled by the hot and dry start to Tuesday, a stormy evening is expected across northern and central Illinois, with storms hammering Iowa and Missouri in the afternoon hours.

Here's a timeline of Tuesday's forecast and when you should expect a threat of severe weather:

Tuesday Afternoon

Much of the region remains hot and dry through the afternoon hours.

While a few clouds could pass through with an isolated shower, nearly all of the area is expected to stay dry through 6 p.m. Tuesday, according to NBC 5 Storm Team Meteorologist Alicia Roman.

Storms moving through Iowa Tuesday have spawned numerous tornado warnings, and a tornado watch is in effect for that state, as well as parts of western Illinois and far southern Wisconsin.

Tuesday Evening

The real threat for storms moves in Tuesday evening.

"The best chance to see those showers and storms will really be after 7 p.m. moving from west to east," Roman said, noting that "all weather hazards are possible."

From 7 p.m. through midnight, severe storms will likely hit the region, "quickly passing through our evening hours," Roman said.

The storms will move quickly, at roughly 45-to-55 miles per hour, through the western suburbs and into the rest of the Chicago area, with some of the worst storms possible in those suburbs and along the Illinois-Wisconsin border.

7 p.m.

According to early morning projections, the storms will likely start in the western suburbs between 7 and 8 p.m.

9 p.m.

Early projections indicate storms could reach city limits between 9 and 10 p.m., Roman said.

11 p.m.

The storms are expected to hit southern counties and northwest Indiana late Tuesday evening.

12 a.m.

The storms are forecast to move out just before midnight Wednesday.

What to expect

Roman noted the system is fast-moving and "could definitely pack a punch."

The entire Chicago area is at an "enhanced" risk for severe weather, a level three threat out of five.

Roman said the biggest threats with the storms will be damaging and destructive winds, with gusts up to 75 mph considered the "primary threat."

"But tornadoes are also right behind it," Roman said. "That possible spin up, brief tornadoes [are] possible into the evening hours. A lot of this will be a nighttime while you're sleeping, so have a way to get alerts on your phone."

Areas out to the west of the Chicago area could see even more violent winds and a higher threat of tornadoes, with areas around the Quad Cities potentially at a "moderate" risk of severe weather, officials said.

Rest of the week

After the storms, temperatures begin to cool down with highs in the mid-70s, though the 80s return by the end of the week with another chance for showers.

Stay tuned to the NBC 5 Storm Team for all the latest weather news and information.

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