Thread by @NWSChicago

.Thu 12/22 AM Update! 1) Key Messages for the Dangerous Winter Weather Today-Early Saturday:
Conditions will deteriorate quickly late AM-aftn hours with snow, gusty winds & plummeting temperatures. The snow will taper on Friday though dangerous cold will remain. #ILwx #INwx (1/6)

.Arrival time of hazardous travel conditions today: Arctic front will sweep across the area from late AM thru early aftn from west to east, with accumulating snow, plummeting temps & gusty winds. A flash freeze may cause ice covered roads, topped by the snow. #ILwx #INwx (2/6)

.Periods of whiteout (blizzard) conditions likely later today thru Fri. night, especially in open areas. North-south roads most susceptible to blizzard conditions & drifts due to strong west-NW winds. With -30 to -40 wind chills, getting stranded can be deadly! #ILwx #INwx (3/6)

.Here’s a timeline of the dangerous winter weather today through Saturday. Impacts from this storm will be driven by a combination of cold, wind, and snow rather than snow alone! Avoid non-essential travel. #ILwx #INwx (4/6)

.While most of area will only see moderate snow amounts with the exception of northern Porter Co., the combination falling snow, gusty winds & plummeting temperatures will make travel conditions treacherous from later this morning & this afternoon onward. #ILwx #INwx (5/6)

.Temps will plummet this afternoon with wind chills dropping to -25 to -35 this eve. & to -35 to -40F by late tonight and Fri. AM. Frostbite may develop on exposed skin in as few as 10-20 mins! Hypothermia can quickly develop if you're not dressed for the cold. #ILwx #INwx (6/6)