Mild December may be about to turn wintry


This month is currently ranked the 5th warmest December on record. Saturday marked the 19th consecutive day of above normal temperatures. Readings Saturday evening topped the 50-degree mark for the second consecutive day. Chillier air is due to arrive on Sunday, with high temps through midweek forecast to average only 5 to 8 degrees above normal. Latest computer forecasts show the Chicago area trending much colder about Thursday. The Winter solstice occurs Friday at 5:12 AM CST. In line with the calendar, Friday is also forecast to be the first day this season with a sub-freezing high temperature. The influx of polar air is to arrive in the wake of a deepening storm system. This system may produce the season’s first measurable snowfall on Thursday.  Blustery winds are forecast to accompany the late-week turn toward colder weather.