I think you've heard it all here but if I might sum up the best advice I've read here it's this. Check the weather before you hit the road and be ready to change your plans if the weather looks like it isn't going to cooperate. Don't get caught out in the open in a storm. If you do don't make yourself the tallest target. If that means getting into a ditch or culvert during a violent storm, do it. Don't stand under utility poles, trees, or other structures that might tend to attract lightning to them. If the storm is only rain with no lightning then simply ride through it if you wish.
I think that dealing with weather on a bike is all about common sense. Use it and you'll be just fine.
Mike