NOAA has confirmed that California saw an F-0 tornado yesterday.
“A survey team went out yesterday to take a closer look at the tornado that formed near Davis, CA, on Sept 28, 2019. It has been confirmed to be an EF-0 tornado that formed around 6:40 pm that evening. No damage was found or reported.” – NOAA, Sacramento CA, 9/30/19
NOAA did briefly issued Tornado Warnings just north of Davis on Saturday.
California averages 11 tornados per year.
California saw 403 tornados between 1950 and 2013.