Porches? Wimps! :jump:
Okay honestly my porch is just useless otherwise I would consider using it as well.
As far as safety guidelines they are the same whether you are shooting with a camera or outside at all. Don't be the tallest object, don't stand under the tallest object, etc.
I personally don not shoot if it is raining much, not because I am worried about getting wet, or the camera getting wet, but water spots on the lens ruin shots and can be a pain to clean. I have attempted to shoot from within a car during actual rain by using a tripod. I also prefer to use long shutter speeds rather than trying to time the lighting. I just set the F stop between F11-F22, ISO 100, and the appropriate shutter speed. It might be a couple minutes but it can allow for multiple strikes in one exposure.
I am hoping a storm builds up Saturday as I will actually have some time to go out and shoot for once.