- The weather service says the timing of the wintry mix being coincident with the morning commute could maximize travel impacts.
Drivers should use caution while traveling and "be prepared for snow-covered roads and limited visibilities", the weather service said.
A Winter Weather Advisory is in effect for the I-70 corridor, including the St. Louis Metro area, from 4 p.m.to midnight.
Tonight, snow, mainly after 5 a.m.
Onton said daytime temperatures for today are expected to remain "well below freezing", and daytime wind chills will make it feel like anything from 8 degrees to minus 2. East wind 3 to 8 miles per hour. The chance of precipitation is 30 percent. West southwest wind 7 to 11 miles per hour. The line could move more to the north, meaning more rain, or more to the south, meaning more ice potential, the closer the storm gets. High near 36. Light and variable wind.
Wednesday night, the low will be around 19, with a calm wind becoming south 5 to 8 miles per hour after midnight, according to the weather service.
In February normal highs warm from mid-20s at the start of the month to low 30s by month's end.
Chances for snow pick up overnight and becoming more likely by dawn Wednesday. A low of 22 degrees is in Wednesday night's forecast, Thompson said.
The rain will continue into the afternoon Sunday, but temperatures are expected to rise above freezing, so any trouble caused by the icy weather should improve throughout the day.
The normal high for this time of year is 23 degrees.
Sunday night, the low will be around 17 with mostly cloudy skies, according to the weather service.