A powerful winter storm system moving across the Great Lakes and Northeast is bringing snow and ice, frigid temperatures and possible whiteout conditions.

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.

A powerful winter storm swept across the central and eastern United States, knocking out power and snarling travel during one of the busiest stretches of the holiday season.

Lake effect snow, intense rain and chilly temperatures dominate the forecasts for different parts of the U.S., before and after the new year arrives.

After periods of ice and rain overnight, a long-duration lake-effect snow system moved into the state Monday morning. In Western New York, wind gusts reached up to 70 mph, creating dangerous whiteout conditions. Lake-effect snow is expected to persist off Lakes Erie and Ontario for much of the week.

More rain and snow are expected through the weekend in Northern California. The KCRA 3 weather team issued an Alert Day for Saturday because conditions could risk public safety for the Valley and Foothills. It's an Impact Day for the Sierra.

A storm is expected to bring rain and snow to the Los Angeles area this weekend, with gusty winds and possible flooding possible in burn scar areas, forecasters said.

A major winter storm that blasted Minnesota on Sunday is still impacting travel conditions on Monday. Follow live updates.