Warm, springtime temperatures in Billings on Saturday will probably give way to a cold front moving into the area with light rain and the possibility of overnight snow.
The expected high of 64 degrees is likely to happen by 3 p.m., said Vickie Stephenson, a hydrometeorological technician with the National Weather Service's Billings office.
After that, a front of cold Canadian air is expected to sweep into the region and drop temperatures into the low 30s by midnight. Sporadic thunderstorms are expected and light rain — between one- and six-hundredths of an inch — could fall later in the day.
It's much the same across of southern and eastern Montana, with a winter warning and weather advisory in effect for the northeastern corner of the state around Glasgow as the cold air moves north, Stephenson said.
A snow/rain mix with less than an inch of accumulation is possible overnight. Temperatures are expected to be in the mid to high 30s on Sunday, with a high of 39 in Billings, and a 70 percent chance of either or snow or rain throughout the day.