California Gov. Gavin Newsom intends to order the closure of all state beaches and parks starting Friday, according to a copy of a memo provided to CNN by a senior law enforcement official.

“We wanted to give all of our members a heads up about this in order to provide time for you to plan for any situations you might expect as a result, knowing each community has its own dynamics,” the memo says.

The closures are expected to be announced Thursday, and state park personnel will help in local efforts to close the sites, the memo said.