The counties of Sonoma and Napa will be conducting a targeted emergency alert and warning test this Thursday, according to officials.

The exercise will take place along with local law enforcement and fire agencies and will be a test of the Wireless Emergency Alert, or WEA, for the evacuation zone of SON-6F4, which is in the Sonoma Valley near the Sonoma-Napa county line.

The zone only has about 400 residents.

The alerts will go out from 10:45 a.m. to 11:30 a.m. on Thursday. It is not an evacuation exercise, just a test of the alert warning system, Sonoma County said.

The WEA alert system broadcasts to a targeted geographical area, much like federal systems which alert people to emergencies via text. Residents should have their phones on and make sure the phone's sounds are on as well, the county said.

WEA is a national service and there is no need to sign up to be notified.

For more information, visit https://socoemergency.org/get-ready/events-exercises/.

Meanwhile, according to our news partners at the California Report, this is tsunami preparedness week for California counties along the state's North Coast, like Mendocino, Del Norte and Humboldt.

The center point of the week is a multi-county tsunami response exercise starting on Wednesday morning.

Residents in designated tsunami hazard zones are asked to practice evacuations to higher ground. During the exercise, people are also asked to review tsunami hazard maps to see if they are in an area that might be at risk in the event of a real tsunami.