California, Oregon and Washington simultaneously announced a Travel Advisory for Non-Essential Travel for their residents on Friday morning. The advisory urges people coming to California from other states or countries to self-quarantine for 14 days after arrival.
https://sacramento.cbslocal.com/2020/11/13/california-oregon-washington-covid-travel-advisory/
https://sacramento.cbslocal.com/2020/11/13/california-oregon-washington-covid-travel-advisory/