Follow-up that was done as a text post.  
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advent-of-mechanus asked: For the weather-lingo impaired, care to explain a domino storm?
 
Rumble: Let’s put it this way. Most storms are made like a puzzle. You grab all the cloud pieces and put them together, and that’s your giant storm.
 
A domino storm is like that unicorn game Jenga, or whatever. You pile clouds up high in a wide tower. Then, you try to knock it down. All of it. If you do it right, the clouds will spread out and grow by itself as it absorbs any other clouds in the way. The result is this HUGE storm that covers 20 sq km and it’s only done in as little as 20 minutes.
 
Only a few pegasi can do it the right way. And I swear, I’m not one of them.