HEY CALIFORNIA PEOPLE!
HURRICANE ADVICE FROM A FLORIDIAN!
Make sure you've got shelf-stable food and water for everyone in the house, including pets. The rule of thumb is a gallon per person per day. Freeze water bottles if you want cold water.
Make sure you have enough meds!
Make sure you have batteries, candles, flashlights, and a manual can opener.
Make sure your electronics, including backup batteries, are charged. Unplug things you don't want fried in case of a power surge.
Don't tape your windows, it doesn't help and you'll just be stuck scrubbing goo off of them later.
Put a mug of frozen water in it in your freezer with a quarter on top of it. If your freezer defrosts, the ice will melt and the quarter will sink and tell you you need to throw things out.
Get everything that's not nailed to a foundation out of your yard. That dead branch hanging on by a thread? Time to get it down (it was probably time to do that three days ago, but now’s better than never).
Park away from powerlines and trees if you can. Rain makes the ground soft and then trees fall over.
Have an evacuation plan to a shelter. Evacuate if they’re telling you to.
If you start to flood, don't go in your attic. You'll get trapped if the water rises too high and you can't hack through your roof. This happened to a lot of people in Texas and Louisiana. Get ON the roof.