Chicago's Chilling Halloween: Snow Squalls and Sub-Zero Temps Loom

Chicago residents are preparing for a Halloween marked by "bursts" of snow, squalls, and wind chills in the 20s.

The forecasts are a stark reminder of ongoing climate changes and corresponding weather shifts, according to NBC Chicago.

A frosty beginning to Halloween day put a freeze warning in effect until 9 a.m. for Illinois and Indiana regions including Kankakee, Cook, Will, and Lake counties, as well as Porter, Newton, and Jasper counties. The National Weather Service warned that "sub-freezing temperatures in the mid-20s" could damage crops, sensitive plants, and unprotected outdoor plumbing, according to NBC Chicago.

Snow squalls, characterized by their quick-moving nature and hazardous conditions, is expected to hit Chicago and Northern Illinois later Tuesday. These episodes of moderate to heavy snowfall severely impact visibility, posing risks to road safety during holiday celebrations. The National Weather Service cautioned about "sharp visibility drops" and indicated that any slushy accumulations might likely persist on grassy surfaces due to above-freezing temperatures.

Waves of snow showers and squalls are expected later this morning and afternoon. Temperatures will be warming above freezing, so any slushy accumulations will likely remain relegated to grassy surfaces, but be prepared for sharp visibility drops! #ILwx #INwx pic.twitter.com/g9Qlft4NQg

— NWS Chicago (@NWSChicago) October 31, 2023

Weather predictions for Tuesday evening show widely scattered snow showers mixed with rain, potentially creating slushy conditions. A "final burst" of snow could result in a snowfall rate of one inch per hour in northeast Illinois. In northwest Indiana, lake-effect snow is expected, promising a moderate to heavy snow-rain mix closer to the lake.

Providing some relief, the NBC 5 Storm Team forecasted temperatures to rebound to the upper 50s by the end of the week.