Temperature roller coaster over next 36 hours means mix of precipitation for St. Louis

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ST. LOUIS, MO (KTVI) - The roller coaster ride of weekend weather has begun.  A storm system starting to impact the St. Louis region is kicking things off with the potential for slick driving Friday afternoon. It has been very cold the last few days and air temperatures, for now, are below freezing at the surface. As some moisture and warmer air overtops the cold air, pockets of light rain have developed. That drizzle is falling into the below freezing air near the ground and freezing on contact resulting in slick streets and sidewalks and some ice on area windshields. The precipitation is very light, but it only takes a light coating to create problems.

By 8:00pm Friday night, air temperatures at the surface rise above freezing and they continue to warm up overnight. Any spotty precipitation we see overnight or early Saturday will be all in the form of rain.

Temperatures as we wake up Saturday are in the mid 40°s. But then an arctic cold front moves through late in the morning and we see  dropping temperatures throughout the afternoon and evening. Any lingering rain will mix with freezing rain and sleet before changing over to light snow Saturday evening. There could be some spots that see up to a 1/2” of snow west of metro St. Louis.

Any snow ends around midnight Saturday. Skies clear and the coldest air of the season arrives by Sunday morning.  We’ll wake up in the single digits on Sunday with wind chills below 0°.