(Riverton, Wyo.) – Lander Lil on Sunday predicted six more weeks of winter. Today, the National Weather Service Forecast Office in Riverton is predicting another frigid week in Western and Central Wyoming, beginning with a cold air mass invading the area later today. Here is the synopsis from the NWS:

“The next winter storm system will bring unsettled weather to the Cowboy State this week. This system will also bring colder Canadian air across the Northern Rockies. Increased cloudiness will occur across the state today, as light snow develops over western portions. Then look for widespread snow across the forecast area by Monday night into Tuesday. Expect bitter cold, sub-zero temperatures over the state by Tuesday night, Wednesday and Thursday.”

A WINTER WEATHER ADVISORY IS IN EFFECT FOR THE NORTHWESTERN MOUNTAINS THIS AFTERNOON THROUGH TUESDAY MORNING…

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

DAY ONE…TODAY AND TONIGHT

SNOW WILL SPREAD IN THE NORTHWEST THIS MORNING AND AFTERNOON AND ACROSS AREAS EAST OF THE DIVIDE TONIGHT. PLEASE SEE THE LATEST WINTER WEATHER ADVISORY STATEMENT FOR DETAILS.

DAYS TWO THROUGH SEVEN…TUESDAY THROUGH SUNDAY

TUESDAY THROUGH THURSDAY…BITTER COLD AIR WILL BE OVER THE NORTH AND CENTRAL PORTION OF WYOMING DURING THIS PERIOD. THE FAR WEST AND SOUTHWEST PART OF WYOMING WILL STILL SEE VERY COLDĀ TEMPERATURES…BUT NOT TO THE EXTENT AS THE REST OF WYOMING.

THURSDAY AND FRIDAY…A CHANCE OF SNOW IN SOUTHWEST WYOMING AND ACROSS SWEETWATER COUNTY.

For your local weather forecast, click here.