NAPA, Calif. - Fresh snow fell Monday night on Highway 29 in Napa County.
The snowflakes were captured in this video taken on the Mount St. Helena grade above Calistoga, 2,000 feet above sea level.
Some drivers were caught off guard and tow trucks had to be brought in to help.
A weather phenomenon known as an "atmospheric river" dumped up to 5 inches of rain further north in the Sacramento region and up to a foot of snow in the mountains on Saturday, said Eric Kurth, a meteorologist with the National Weather Service.
Another powerful system is expected Wednesday and Thursday that could bring up to 3.5 inches of rain in the Sacramento Valley and up to 3 feet of snow in the mountains along with wind gusts of up to 50 miles per hour.
Then another storm is forecasted to hit the area this weekend, with forecasters anticipating up to 2 inches of rain in the valley and snow of up to 2 feet in the mountains.