Chicago Metropolitan Area Endures Extreme Winter Weather Onslaught

The Chicago metropolitan area has experienced a period of extreme cold, followed by a series of winter weather events including lake-effect snow, broader snowfall, and thunderstorms. These conditions have led to widespread transportation disruptions, school closures, and various weather advisories for residents and travelers.

Extreme Cold Grips Chicago: Friday's Initial Impacts

An Extreme Cold Warning was in effect for the Chicago area on Friday from 3 a.m. to noon, with extremely cold conditions projected to persist throughout the day. Temperatures dropped to 5 degrees Fahrenheit by midnight Thursday, reaching -7 degrees Fahrenheit by Friday morning.

Wind chills were reported to range from -30 to -40 degrees Fahrenheit, posing a risk of frostbite on exposed skin within 10 minutes.

In response to the severe cold:

• Some schools announced closures for Friday.
• Warming centers were operational across Chicago and its suburban areas.
• Metra operated on a reduced schedule across all lines on Friday.
• The South Shore Line followed a weekend/holiday schedule on Friday.

On Friday, intense snowfall impacted the northern suburbs, including areas along the Edens Expressway, leading to slippery roadways and multiple vehicle crashes. Additionally, an American Airlines plane at O'Hare International Airport had its wingtip contacted by a deicing truck, necessitating a replacement aircraft; no injuries were reported.

Snowfall totals as of 10 p.m. Friday included Portage (4.0 inches), Merrillville (4.0 inches), Chesterton (4.0 inches), Morton Grove (3.7 inches), Lake Station (3.7 inches), and O'Hare (2.5 inches).

Weekend Unfolds: Snow, Travel Chaos, and Thunderstorms

On Saturday morning, temperatures in the region were recorded between -3 and -11 degrees Fahrenheit, with wind chills ranging from approximately -20 to -25 degrees. Temperatures were predicted to increase above zero later in the day.

A Winter Weather Advisory was active for numerous counties from Saturday night through Monday, including Cook, Lake, DuPage, Kendall, Grundy, Kankakee, LaSalle, Will, and Livingston in Illinois, and Newton, Jasper, Lake, Porter, and LaPorte in Indiana. Specific advisories for lake-effect snow on Saturday covered Cook and eastern Will counties until 4 p.m., Porter County until noon, and Lake (Ind.) County until 6 p.m.

Lake-effect snow intensified between 5:30 a.m. and 6:30 a.m. Saturday, then weakened after 8 a.m., with meteorologists expecting it to diminish by late afternoon. Along the lakefront, an additional 2-4 inches of snow were possible.

A broader winter storm was forecast to bring up to 6 inches of snow to parts of the Chicago area between Saturday evening and Sunday. Snowfall totals were expected to vary significantly due to the lake effect, with lakeside locations potentially receiving 5 to 6 inches, while areas 10 to 20 miles away could see rapidly decreasing amounts. Kane, DeKalb, and McHenry counties, not under the advisory, were expected to receive up to 1 inch of snow. The snow was anticipated to be light and fluffy, potentially contributing to slick road conditions from Saturday night through Sunday. Road conditions in northwest Indiana were impacted, with snowplows active.

The broader winter weather event led to widespread air travel disruptions across the U.S., with over 8,000 flights canceled nationwide over the weekend.

On Saturday, nearly 200 flights at O'Hare International Airport and 30 at Midway International Airport were canceled. As of 5:32 a.m. Saturday, O'Hare reported 91 flight cancellations and average delays of 21 minutes, while Midway had six flight cancellations and delays under 15 minutes. The Federal Aviation Administration (FAA) coordinated with airlines and airports for preparations, warned of possible airport closures, and committed to supporting recovery efforts. At least 17 states declared a state of emergency in anticipation of the storm.

Multiple rounds of thunderstorms were forecast for Sunday. The first round was projected from 9 a.m. to noon, expected to weaken upon reaching the city. A second round was anticipated from 4 p.m. to 9 p.m., with a potential for damaging wind gusts. Most of the Chicago area was at a Level 2 risk for severe weather, while northern and northwestern suburbs were at a Level 1 risk. A High Wind Warning was in effect for Kankakee County and Northwest Indiana from Sunday 10 a.m. to 9 p.m., forecasting wind gusts up to 60 mph.

Early Week Outlook: More Snow and Lingering Cold

A third round of storms was anticipated around 1 a.m. Monday, transitioning to snow. Snowfall was expected to continue through the Monday morning commute, concluding around 10 a.m., with possible accumulations of one to four inches. A Winter Weather Advisory was issued for McHenry, Lake (IL), Northern Cook, DeKalb, DuPage, Kane, Kendall, and LaSalle counties from Sunday 10 p.m. to Monday noon. Lake-effect snow was also possible on Monday morning.

Very cold temperatures are expected to persist in Chicago throughout the upcoming week. The forecast indicates cold, dry weather for the remainder of the week, with a potential for a wintry mix by Friday.