Weather

Snowfall from the weekend will continue to melt Monday across the Northeast as temperatures rise several degrees above normal. Rain will stretch from the lower Great Lakes to the Middle Atlantic and New York state.

The rain will develop along the leading edge of an even warmer air mass, which will move from the southern Plains and the South to the Ohio Valley. Some record highs may be challenged as temperatures rise to levels more typical of late April or early May.

A cold front slicing into the warmth will produce showers and thunderstorms from near Chicago to Dallas. Snow and ice will expand across the northern Plains.

A powerful storm will bring heavy snow to the central Rockies as strong winds affect the Desert Southwest. The wind may kick up blowing dust in the deserts and will increase the risk of wildfires across the southern High Plains.

Snow showers are expected over the mountains of the Southwest — including around Flagstaff, Arizona — as cold air moves into the West. Highs will be 10 to 20 degrees below normal, with record lows being challenged in many spots at night. A hard freeze will affect California’s Central Valley.

Snow will extend from the central Rockies to Lake Superior, resulting in difficult travel conditions for motorists Monday into Tuesday. Accumulation is expected to reach 6 to 12 inches between Wyoming and north-central Minnesota.