The National Weather Service has increased its snowfall forecast and expanded a winter storm warning in Iowa. Here's what to know.

If certain atmospheric conditions align, more than half of the U.S. could see significant snowfall later this week and weekend.

The sheriff’s office in Nevada County, Calif., said a storm that moved through early Thursday has slowed their work.

On Tuesday at 2:28 p.m. EST an updated winter storm warning was issued by the National Weather Service valid for Wednesday between 1 a.m. EST and 10 p.m. EST for Emmet, Cheboygan, Presque Isle, Montmorency and Alpena counties.

At 12:03 p.m. on Tuesday, the National Weather Service released an updated winter storm warning in effect until Thursday at 10 a.m. for Jackson County.

A lightning strike sparked a fire that burned hundreds of palm trees at a nursery in unincorporated Escondido. Early reports estimated about 100 trees caught fire, but a battalion chief at the scene later told NBC 7 about 1,000 trees were damaged.

A storm sweeping through the San Francisco Bay Area knocked out power to more than 7,000 customers across the Peninsula and South Bay on Thursday morning, according to Pacific Gas & Electric Co.

The second in a series of Northern California storms was moving through the Bay Area and Central Coast on Tuesday, bringing rain, gusty winds, lightning, local snow, and much colder temperatures through midweek.