More than 40 million are on alert as the next winter storm is forecast to bring inclement weather from the Dakotas into northern New England over the coming days.

In Minnesota, forecasters warned of “potentially life-threatening travel conditions” as whiteout conditions reduced visibility. Heavy snow was expected over the Upper Midwest and Great Lakes.

At the Pacoima Wash in San Fernando, a person called 911 to report seeing a woman in the fast-moving waters, the Los Angeles Fire Department said. Crews were using markers to try to find the woman, who was wearing all black and traveling at 25 miles per hour in three feet of water. They did not find her.

The National Weather Service said two more impulses will move through the area with the potential for flooding in the burn scar areas.

A Winter Storm Watch is in effect ahead of a powerful winter storm coming in from the Ohio River Valley that could bring widespread snow to NYC and the Tri-State.

An updated winter storm warning was issued by the National Weather Service on Monday at 1:02 p.m. valid from Tuesday 10 p.m. until Friday Dec. 26, at 10 a.m. for the Greater Lake Tahoe Area.

Southern California is in for a wet Christmas week, with four days of rain expected to begin Tuesday, forecasters said Sunday. A flood watch was issued for Tuesday afternoon through Wednesday evening for much of Los Angeles County,