Winter Storm Warning in effect from 3 PM this afternoon to midnight CST Sunday night... The National Weather Service in Chicago has issued a Winter Storm Warning for heavy snow... which is in effect from 3 PM this afternoon to midnight CST Sunday night. The Winter Weather Advisory is no longer in effect. * Timing... expect snow to develop this afternoon and then diminish by Sunday evening. * Snow accumulations... the heaviest totals are expected north of Interstate 88 where storm totals of 7 to 11 inches are likely by Sunday evening. South of Interstate 88 to the I-80 corridor totals of 5 to 9 inches are expected by Sunday evening. Snow amounts should tapper off south of Interstate 80 into the 3 to 6 inch range across far southern sections of the warning area... where the snow could mix with rain later Sunday. * Visibilities... look for reduced visibilities during the heavier snowfall... likely below a mile at times. * Impacts... plan on difficult driving conditions. Precautionary/preparedness actions... A Winter Storm Warning for heavy snow means severe winter weather conditions are expected or occurring. Significant amounts of snow are forecast that will make travel dangerous. Only travel in an emergency. If you must travel... keep an extra flashlight... food... and water in your vehicle in case of an emergency.