Snow will fall over much of the higher Rocky Mountain region for the first day of the workweek.
Central and eastern Idaho, southwestern Montana, Wyoming, northern Utah and northern Colorado will have snow in higher areas, including some important passes.
Most snowfall will amount 1 to 3 inches today, but with up to 6 inches locally.
Major highways that will be subject to snow-slicked surfaces will include: I-15, I-70, I-80, I-84 and I-90.
Another shot of snow will follow quickly on the heels of this one, mostly from Montana to parts of Idaho and Wyoming.
For a larger version of this map, visit the AccuWeather.com Winter Weather Center.
Severe thunderstorms rumbled through the Northeast on Monday, lashing the region with damaging winds while also unleashing heavy downpours that triggered flash flooding.
A stifling heat wave will remain entrenched across the Northeast this week, despite a brief reprieve in humidity for some.
Dangerous heat will surge northward and send temperatures rising across the northwestern United States this week.
Downpours will spread from the lower Mississippi Valley to eastern and central Texas early this week, delivering needed rain but raising the concern for flash flooding.
A renewed risk of severe weather will threaten portions of the north-central United States into midweek.
Thousands of structures, including a wildlife refuge home to more than 400 animals, are threatened by the Sand Fire in Southern California.
Newark, NJ (1989)
99 degrees -- tied 1940 record.
Cold morning: 39 degrees at Ironwood and Marquette.
Pueblo, CO (1993)
A double record: 52 degrees in the morning and 101 degrees in the afternoon.