Both heat and overpressure would be good to have, actually.
The linked one isn't bad. If you click on the impact icon it'll tell you what the various colors are indicating. I don't agree with their effects for "conflagration"....I think more are going to be dead long before 24 hours.
Plus, it would have been better with a little more variety. It was good to have the originals out there, and the biggest one, but an asteroid??? Like we need an indicator to tell us that we'd be screwed if that happened on a major scale.
Putting in a variety of Russian, British, American and some "estimated" others would be good. (like China, India, Pakistan, Israeli, etc.)