A major winter storm is officially approaching, and it is crucial to finalize your preparations now.

Milwaukee area school districts, universities and colleges are calling off classes and activities because of artic air in the forecast.

Drivers are urged to stay at home as roads, especially bridges and overpasses will be hazardous and overall travel conditions could become treacherous.

Sunday and Monday mornings will bring the coldest temperatures with lows in the teens and wind chills in the single digits to below zero. There may be a brief window for snowfall early Sunday, but drier air will be pushing in and precipitation will be coming to an end around midday Sunday.

Crews began spraying parts of I-10 and Highway 290 on Thursday and they'll continue treating major freeways and secondary roads on Friday.

Today, their primary focus will be applying brine to highly-traveled corridors, including I-35, I-14, SH 6, US 84, and other major roadways.