BOZEMAN, Mont. -

Snow and bitter cold temperatures are expected to slam southwest Montana by the end of this weekend.

NBC Montana's First Alert team has been following this system all week, and have all of southwest Montana under a winter storm watch.

While we've already seen winter weather impact higher elevations, this could be the first major valley snow of the season.

With the incoming snow, the Bozeman city workers are closely following forecasts, and preparing to plow for the first time this season.

City Streets Superintendent John VanDelinder said they've got the plows ready to go, stocked the trucks with sand and workers will be ready hit the streets early on Monday.

"We've got five trucks ready to go- plows on there, sanders on there- we've got four of our five motor graders ready to go," VanDelinder said. "We're ready. We've got a 3 o'clock crew coming in on Monday morning, and everybody else is available at any time by phone call."

Because it's been so warm, he said the roads are more likely to ice over when the temperatures drop. So it's their job to try and help keep people safe.

"They'll go until it's cleaned up. Guys will work late and start the next morning- whatever we got to do," VanDelinder said. "We're kind of planning right now for... probably a two-day storm, and then get back to leaf clean up. But we may be doing leaf clean up Monday and plowing at the same time."

Monday is the first day of fall leaf cleanup in the city core. While VanDelinder said they still plan to sweep up leaves- if it snows too much, he said they'll have to delay it until conditions clear back up.