Various government agencies offer a way to sign up to receive phone calls in the event that some disaster or event might affect you. These are often called "reverse 911" or "emergency notifications". If you have an old style, landline phone, it can be included in these systems automatically, as the location is known. Cellular and VOIP phones, though, create a problem, so signing up for these services is required to make them work for you.
In Santa Cruz county, you can register online here:
Click on the link to "Register your cell or VOIP phone ..."
In Santa Clara county, you can register online here:
In San Mateo county, you can register online here:
These services aren't used often, but they may provide valuable information at times, so consider signing up.
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