I've written a lot about setting up tethering so you can use your cell phone's data as a modem for your laptop. There's probably no more important time to get this set up than when your internet access is threatened. E.g., when your cable router is about to go out from a deadly tropical storm/hurricane.
While the light's flickering, download PdaNet to your computer and connect your smartphone and laptop so that even if your internet goes out, if you have cellular data still available, you can still get to work (or email or Twitter, whatever you need to do now).
Conserve your batteries, though (on both your computer and smartphone), and take other steps to protect your data and stay safe and informed during an emergency.
Here are some other mobile accessories you might need to gather during emergencies.