East's wintry mix could make travel dicey. And yes, that was a tornado in Calif.

A wall of wintry mix and rain was pushing into parts of the East on Sunday as a strong arctic high pressure system was forecast to help fuel snow and ice for a large part of the interior Northeast into Monday, forecasters warned.

And more bumpy weather could roll in behind the storm.

"A roller-coaster ride of a forecast is in store across the Northeast this week," AccuWeatherMeteorologist Brandon Buckingham said. A stew of wintry mix, rain and a warmup could set up a strong storm later in the weak that could bring "accumulating snow and very chilly air," Buckingham said.

AccuWeather meteorologists advised that travel on some highways could be difficult Monday and that flight delays because of deicing operations were possible. A strong dome of high pressure sliding from the Great Lakes toward New England was to blame.

High pressure is usually associated with relatively cool, dry and sunny conditions. However, the lingering effects of the high pressure area will conspire with an approaching storm from the Midwest, creating a "wedge" of cold air as moisture arrives from the Midwest storm, AccuWeather said in its forecast. The storm dumped almost 3 feet of snow in areas near Buffalo, New York, last last week.

Parts of Maryland, Pennsylvania, New Jersey, New York, Connecticut and Massachusetts could see a wintry mix late Sunday and Monday, AccuWeather said. The good news: The big eastern cities along Interstate 95 such as New York, Philadelphia, Baltimore and Washington, D.C., were expected to get mostly rain.

Later in the week, however, "the potential exists for a storm to develop between Friday and Saturday along the East coast," elevating the risk for an impactful snowstorm across portions of the Northeast and New England this weekend," Buckingham said.

Weekend weather includes ice, snow:Even a tornado warning for San Francisco

Cleanup underway after tornado hits near San Jose

The National Weather Service in California has confirmed that an EF1 strength tornado struck the small town of Scotts Valley, 30 miles south of San Jose, on Saturday. Damage included downed trees, downed power poles, trees stripped of branches, numerous overturned vehicles and damaged street signs, the weather service said. Its survey team assessed a maximum wind speed of 90 mph.

The weather service team estimated the torndao was about 30 yards wide and lasted for about one-third of a mile. Scotts Valley police posted photos showing the damage, including flipped cars in parking lots.