A riff on this post from @emergencylegalresponders on Instagram

You learn about each of these via radio, news, and emergency broadcast alerts.

Voluntary evacuation

This is a heads up that severe weather is headed your way and that you should get ready to evacuate. Pack a go back with your necessary paperwork and medication. You are not required to leave at this point, but if you want to get a head start, you can. Have line of sight on enough gas in your car or other way you’ll get out if needed. Start to organize with neighbors and take your mobility impaired neighbors into account. If staying at this point, do what you need to stay safe as conditions worsen.

Mandatory evacuation

Can happen for many different types of disaster. You MUST leave. Staying is life threatening, and emergency personnel may not be able to make it to you if you stay. Staying can also lead to fines or legal consequences in some states.

Shelter in place

Safer to stay indoors rather than evacuate. Usually for things like chemical spills and sudden storms where advance evacuation isn’t possible. You are expected to stay inside.