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ST. LOUIS — Another round of light sleet/snow is possible Monday afternoon and evening south of St. Louis metro area. Temperatures will stay below freezing (32) through the day with highs in the 20s. Overnight temperatures will dip into the teens and 20s again, so the threat of ice remains on any untreated surface. Tuesday afternoon, a final round of a wintry mix is possible south of the metro area. Sleet and snow totals should remain under 1 inch.A winter weather advisory is in effect for the St. Louis area and for all of St. Louis area until 9 a.m. Monday due to icy conditions. Freezing drizzle and sleet has been falling since Sunday evening and sleet/snow will continue to mix in for Monday morning. Accumulations should remain light, less than .10 inches of ice and sleet expected.