Rain and some snow was developing in northern and central Wyoming this morning. The rain and snow will expand and increase in central and southern Wyoming through the day. After sundown, snow will be falling over all of the central and southern counties of the state. Snow will be heavy at times along the I-80 corridor and I-25 corridor of southeastern Wyoming overnight and into early on Wednesday. Snowfall will be much lighter in the central and north. Accumulations of snow in Casper will be around 1 to 3 inches with as much as 4 to 8 inches of snow or more for the I-80 corridor of southcentral and southeast Wyoming. Much colder temperatures are expected statewide as many areas will drop into the upper teens to lower 20s Wednesday night.