According to the Weather station,
9:35AM MST until December 13 at 5:00AM MST by NWS Billings
…WINTER WEATHER ADVISORY REMAINS IN EFFECT UNTIL 5 AM MST TUESDAY…
WHAT…Snow expected. Total snow accumulations between 3 and 6 inches by Tuesday morning.
WHERE…Portions of central and south central Montana. * WHEN…Until 5 AM MST Tuesday.
IMPACTS…Plan on slippery road conditions. Patchy blowing snow could significantly reduce visibility. The hazardous conditions will impact the commutes on Monday and Tuesday.
Additional snow is possible Tuesday into Wednesday night.
A warning is issued when a hazardous weather or hydrologic event is occurring, imminent or likely.
A watch is used when the risk of a hazardous weather or hydrologic event has increased significantly, but its occurrence, location or timing is still uncertain.
An advisory is issued when a hazardous weather or hydrologic event is occurring, imminent or likely.