What do I do in a radiation storm? I've tried hiding in the gas station, places I've built, and caves. How do I avoid the radiation damage?

Gas mask, Rad-x, and rad-away are beneficial
Otherwise find indoors and wait it out

Power Armor also helps, at least on the fringes of the storm I finally got last night. I was also wearing my vault suit for its rad reduction.

Quick note if you are in Boston...

Polwoski Nuclear Protection pods. You will not take any radiation damage when you are inside one, and the door is closed. It's a really nice touch into the game. Though I wish I had the ability to leave custom markers on the map. Those things are hard to find again.