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Tornado, hail threat in forecast – NBC Chicago

The threat of severe weather loomed large in Chicago’s forecast Monday, as multiple rounds of showers and storms were expected to arrive by the afternoon hours.

Severe weather chances also hovered above Tuesday’s forecast, according to the NBC 5 Storm Team.

As the rain moves in, here’s what to expect and when.

Storm timing: Monday

According to Sack, Monday morning started with sunshine, with a chance of a few showers in the north and west. Temperatures were expected to climb into the low 80s around noon, and even higher during the day. Some areas along the lakeshore were expected to remain slightly cooler, Sack added.

A line of thunderstorms was expected to move into the Chicago area around lunchtime, Sack said.

A second round of storms would arrive around 3 p.m. and last until the early evening. In the southern suburbs, showers and storms could last until 9 p.m., Sack said.

According to the Storm Prediction Center, most of the Chicago area is at a “small” risk of severe weather on Monday, which is at level two out of five on the SPC severe weather scale.

Monday’s storms bring chances of damaging winds up to 60 miles per hour, large hail and heavy rain, Sack said.

“An isolated tornado is not out of the question,” Sack added.

According to the National Weather Service, the best chance for severe weather Monday was between noon and 8 p.m., and north of I-80.

“Additionally, thunderstorms will be able to produce heavy downpours that could lead to localized flooding, especially in suburban and urban areas,” the NWS said in an alert.

Storm timing: Tuesday

While Tuesday was expected to remain dry during the day, severe weather chances were forecast for Tuesday evening, Sack said, as another round of storms was expected to arrive around 9 p.m. and last until midnight.

“Additional thunderstorms are likely Tuesday evening into Tuesday night,” the NWS said. “Some of these storms could become severe, with the possibility of damaging winds and perhaps brief tornadoes.”

The severe weather threat for Tuesday appeared to be greatest north and west of the I-39 corridor, according to the NWS.

The SPC said Tuesday that much of the Chicago area is at “low” risk for severe weather, although some parts of DeKalb and LaSalle counties are at “elevated” risk, which is at level three out of five.

The strongest storms were expected to remain in western Illinois, according to forecast models.

Temperature highs Tuesday will remain in the mid-80s, Sack said.