ST. LOUIS, MO (KTVI) -Winter precipitation has returned to the St. Louis area. While it has been all snow farther to the north, the rest of the Bi-State has seen a mix of precipitation thanks to border line temperatures.
A Winter Weather Advisory is in effect until Noon Saturday for St. Louis and counties to the north and west.
The part of the area most in danger of icy weather is north of I-70 in Missouri and most of Jersey, Calhoun, Green, and Macoupin Counties in Illinois. Overnight freezing drizzle has continued into Saturday morning. Untreated roads are quite slick. Precipitation has intensified in the morning hours and will be at its heaviest through mid-afternoon. That's when ice accumulations of up to a 1/4" and a light coating of sleet are likely.
Between I-44 and I-70 in Missouri and north of I-70 in Illinois, including northwest portions of the metro St. Louis region, the forecast gets trickier because the freeze line will lie somewhere in this area throughout the day. Temperatures warmed up overnight from southeast to northwest. Thunderstorms even bubbled up in the region first thing Saturday morning. Look for a cold rain through early Saturday afternoon but the cold air will return later in the day. It’s possible some roads could become slick again as temps fall.
Along and south of I-44 in Missouri and I-70 in Illinois, this is an all rain event.