Denverites were treated with a mild, dry and sunny Sunday, but will shortly replace T-shirts with winter jackets as a storm system is expected to drop 4 to 6 inches beginning Monday afternoon.

The National Weather Service has issued a winter weather advisory that will go into effect across the state in the mountains, foothills and Interstate 25 corridor beginning at 3 p.m. Monday and will be in effect until 3 a.m. Tuesday.

⚠️Winter Weather Advisory⚠️Travel conditions deteriorate Monday afternoon and early eve as heavier snow develops. Travel may become difficult for the foothills including I-70 Corridor, with hazardous travel for I-25 Corridor as well. Plan ahead for your Monday pm commute. #COwx pic.twitter.com/z1RDRyZira

— NWS Boulder (@NWSBoulder) April 18, 2021

Wet, slushy snow is expected to arrive in the metro area around 3 p.m. Monday and will continue throughout the night, said Bob Kleyla, a meteorologist with the National Weather Service in Boulder. 

The system could create some issues during the afternoon commute, but the worst traveling conditions are expected following sunset and on Tuesday morning.

“Roads could get icy and snow packed really quick once the sun goes down, and that heavier snow starts to fall,” Kleyla said.

Current forecasts indicate the mountains and foothills could receive between 6 to 12 inches, while the I-25 corridor could get anywhere between 4 to 6 inches.

Despite Denver reaching nearly 60 degrees on Sunday, temperatures will drop overnight as lows are expected to be in the mid to high 30s.

But the coldest temperatures of the system won’t be felt until Tuesday morning, where current projections forecast temperatures in the teens, Kleyla said.

Temperatures are expected to remain colder than normal into the week, but will begin warming up on Thursday.