Most of Montana is under a Winter Storm Warning through Saturday, meaning a hazardous winter storm is likely.
The STORMTracker Weather Team says this winter storm remains on track to deliver heavy snow from one end of the state to the other in the next 48 hours.
Snow fell in some areas on Thursday, but the main event doesn't get going until Friday.
Meteorologist Mike Rawlins says snow will become a bit more widespread on Thursday night and Friday morning as moisture moves in from the west.
Most locations will receive light snow during this time, making roads snowy and icy.
By late Friday, a stronger disturbance will arrive, producing more widespread heavy snow.
Snowfall rates of 1-2" per hour will be possible at times Friday evening through early Saturday morning.
Rawlins says whiteout conditions may also develop in north-central Montana, making driving nearly impossible during this time.
Significant snow is still expected around the state and no major changes have been made to the current snow forecast.
Regardless of the exact snow amount where you live, travel conditions will deteriorate quickly heading into the final weekend of 2017.
Don't expect a warm-up anytime soon. The brutally cold air in place now will stick around for the next few days.
Temperatures are expected to remain below 0° across north-central Montana on Friday and into Saturday.
5-15 mph wind speeds will push wind chill values down to as low as -30° at times.
Anyone venturing outdoors should dress appropriately and cover any exposed skin to prevent frostbite and hypothermia, which can occur within 30 minutes.