Every once in a while, I find a site that just makes me want to tell everyone. Here's a web site that flightsimmers using real time weather will enjoy. It's a real time lightning display, updated every 15 minutes!
Now, if you are flightsimming, you'll be able to tell where thunderstorms may impede your path. Or, if you're setting
your own weather as you go along, you'll know where to throw in thunderstorms for your own challenge. When I
flightsim, I often use Intellicast for the wide array of services.
Just a few years ago, all of this used to cost many dollars per image. But nowadays, if you're a weather junkie like I am, you can "refresh" all you want for free.