Temps to plunge more than 30° by Thursday
Warmth returned to Chicago Monday, but just for one day. Aided by ample sunshine and gusty south winds, the mercury pushed to the 70º mark for the first time since Oct. 8, a welcome change in a month that has been characterized by cool, cloudy, and rainy weather here. That warmth will be long-gone as colder air moves into the area dropping highs about 20º here on Halloween (Tuesday) and another 10º by Thursday when sub-40º maximums are expected along with some snow showers.
Readings should rebound a bit into the lower 50s by the weekend, and a suite of long-range computer models hint at a milder than normal temperature range next week.
In the western Pacific, a weakened Typhoon Cimaron that left at least 15 dead as it struck Luzon in the Philippines on Sunday is expected to regain strength as it heads across the South China Sea on course to a Wednesday landfall in central Vietnam.
-Steve Kahn WGN-TV Meteorologist