Fourth of July Weather

Thunderstorm Watches and Warnings Issued As Storms Move Into Chicago Area

Storms could fire through the overnight hours

Thunderstorm warnings and watches, along with a now-expired tornado warning, have been issued throughout the day as storms sweep across the Chicago area.

A severe thunderstorm warning has been issued for southern DuPage, southeastern Cook and northwestern Will counties in Illinois until 1:45 a.m.

A severe storm located over West Chicago is churning to the southeast at 40 miles per hour, packing wind gusts in excess of 60 miles per hour.

At the same time, a severe thunderstorm watch has been canceled for Lake and McHenry counties, but remains in effect for DeKalb, Kane, DuPage, Cook, Kendall and Will counties until 3 a.m.

Lake and Porter counties in Indiana are also still impacted by the watch.

Just before midnight, a new severe thunderstorm warning was issued for southwestern Lake County, northern Kane and DuPage counties, and northwestern Cook County until 1 a.m.

The storms, arranged in a line from Hampshire to Elgin, were moving toward the southeast at 40 miles per hour, packing wind gusts in excess of 60 miles per hour and small hail.

The storms could potentially impact parts of Palatine, Des Plaines, Wheaton, Buffalo Grove and other communities.

A severe thunderstorm warning was issued for another line of storms impacting northeastern Cook County until 1:30 a.m. Those storms, moving southeast at 35 miles per hour, extend on a line from Huntley to Evanston, officials said.

Another warning remains in effect until 12:30 a.m. for northern Kane and southeastern McHenry County.

Another warning was issued for parts of McHenry counties until 12:30 a.m. Tuesday, as well as for Cook, DuPage, Kane and Lake until 1 a.m.

The National Weather Service advised people to move inside to the lowest floor of a home or building, if possible. Damage is expected to roofs, siding and trees.

Meanwhile, a severe thunderstorm watch was issued for Cook, DuPage, DeKalb, Kane, Kendall, Lake, McHenry and Will, as well as Lake and Porter counties in Indiana, until 3 a.m.

According to the National Weather service, the Chicago area could see possible tornadoes, ping pong ball-sized hail and wind gusts up to 70 mph.

Earlier this evening, a severe thunderstorm warning was issued for portions of Cook, DuPage, Kendall, Kane and Will counties until 6:30 p.m., where weather officials said to expect wind gusts up to 60 mph and quarter-sized pieces of hail.

A tornado warning issued earlier for southwest LaSalle County was allowed to expire, but heavy rains, gusty winds and the chance of damaging hail are still present.

A severe thunderstorm watch was issued for parts of northern Illinois and northwest Indiana until 7 p.m. Counties in the watch included DeKalb, Kane, LaSalle, Kendall, Grundy, Will and Kankakee in Illinois and Newton and Jasper in Indiana.

The watch warns of the potential for tornadoes, hail and wind gusts of up to 65 mph.

A severe thunderstorm warning was also issued for DeKalb County until 5:15 p.m.

Earlier Monday, Doppler radar indicated rotation within a storm as it moved its way through the southwestern part of LaSalle County, with wind gusts in excess of 60 miles per hour, torrential rain and hail possible.

That rotation weakened significantly after 3 p.m., and officials allowed the warning to expire.

A severe thunderstorm warning was allowed to remain in effect for southwest LaSalle County until 3:45 p.m. as the storms move through.

The storm is pushing to the east at 25 miles per hour, and is expected to impact Peru, La Salle, Lostant and other communities.

Ping pong ball-sized hail and wind gusts of up to to 60 miles per hour were possible with the storms, according to the National Weather Service.

Due to the slow-moving nature of the storm, a flood advisory has been issued for LaSalle County until 5:45 p.m., with minor flooding forecasted in the impacted area due to heavy rains.

Elsewhere in northern Illinois, a severe thunderstorm warning was also issued for Winnebago and Boone counties until 3:45 p.m. Those storms are moving toward the southeast at approximately 25 miles per hour, and reportedly caused wind damage in Lafayette County earlier in the day.

According to the Storm Prediction Center, all Illinois counties that are in the NBC 5 viewing area, including McHenry, Lake, DeKalb, Kane, DuPage, Cook, LaSalle, Kendall, Grundy, Will and Kankakee, are at a “slight risk” of severe weather on Monday afternoon.

A "slight risk" equals approximately a 40% chance of severe storms developing, per the NWS' system.

Lake County in Indiana is also under the "slight risk" categorization. Porter, LaPorte, Newton and Jasper counties are at a "marginal risk" of severe storms, a step below that classification.

The main potential threats with the storms could include damaging hail, with most of northern Illinois at approximately a 15% chance of hail at least one inch in diameter or more, and possible tornadoes, with isolated twisters possible with the weather system as it moves through the region.

As for the time of arrival, it appears that the main threat of storms will arrive in the early-to-mid afternoon hours, starting out in the western suburbs and slowly filtering their way through the rest of the Chicago area in the mid-to-late afternoon.

High temperatures on Monday are expected to reach into the low-90s, providing plenty of fuel for potential storms to develop.

Chances for showers and thunderstorms will be in the forecast for most of the week, with those storms potentially firing each afternoon as an unsettled weather pattern gets rolling.

By Friday however that chance will begin to diminish, and cooler temperatures could also be on tap, with highs only forecast to reach around 80 degrees at the end of the work week.

Be sure to download the NBC Chicago app and have push alerts active in order to receive the latest updates about any severe weather that could threaten the Chicago area.

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