...WINTER STORM WATCH IN EFFECT FROM SUNDAY AFTERNOON THROUGH MONDAY AFTERNOON... ...Heavy mixed precipitation possible. Total snow accumulations of 3 to 7 inches and ice accumulations of up to one tenth of an inch possible. ...Portions of central, east central and northeast Missouri and south central, southwest and west central Illinois. ...From Sunday afternoon through Monday afternoon. * IMPACTS...Plan on slippery road conditions. The hazardous conditions could impact Sunday evening travelers and the Monday morning and evening commutes. ...Temperatures remaining in the middle to upper 20s will aid in the rapid accumulation of snow, especially on untreated roads, bridges and overpasses.