Temperatures rise quickly into the low 40s Thursday around Denver after overnight lows bottomed out around zero.

Denver residents can expect mostly sunny skies, with a high near 42, according to the National Weather Service in Boulder. Wind chill values are forecast to be as low as -7 with south winds blowing between 5 to 7 mph, becoming north northeast in the afternoon.

Tonight expect mostly cloudy skies, with a low around 25. East wind 5 to 9 mph becoming south southwest after midnight. Winds could gust as high as 15 mph.

“Travelers should prepare for a prolonged period of moderate to locally heavy mountain snowfall Thursday night through Saturday, impacting travel on all passes,” the NWS said.

“For the lower elevations, another round of light snow is expected Friday night, with potential for a second storm system and additional snow late Monday into Tuesday.”

Here’s the 4-day forecast from the National Weather Service.

Friday: A 20% chance of rain after 11 a.m. Increasing clouds, with a high near 55. South southwest wind 6 to 8 mph becoming northwest in the afternoon.

Saturday: Snow likely, mainly after 11 a.m. Mostly cloudy, with a high near 34. Light northeast wind becoming north northeast 5 to 9 mph in the morning. Winds could gust as high as 18 mph. Chance of precipitation is 60%.

Sunday: Mostly sunny, with a high near 42.

Monday: A slight chance of snow before 11 a.m., then a chance of rain and snow. Mostly sunny, with a high near 51.