DAVIS, Calif. (AP) – The National Weather Service says a tornado touched down in a California field as thunderstorms swept through the central part of the state. Cell phone video posted online shows the towering vortex spinning Saturday near Davis. NWS forecaster Emily Heller tells the San Francisco Chronicle there was no damage. She says tornadoes in the Central Valley aren’t entirely unusual and are typically weaker than ones seen in the Midwest. One Twitter user wrote she was “totally terrified.” The storm dropped a layer of dime-sized hail on some roadways. More stormy conditions are possible Sunday. To the east, forecasters issued a winter weather advisory after several inches of snow fell at high elevations in the Sierra Nevada. The unstable weather is the result of a cold front over the Pacific Northwest.