Examining this episode's premise more closely, I'm a little confused by it. Why precisely is Fluttershy suddenly asked to aid the other Pegasi with the weather, when up until now we've never even seen her do so much as move a cloud, let alone all the complex feats that are involved in typical weather work.
One thing I've always wondered about is how much natural rainstorm production there is in Equestria versus artificial production via weather factories in cities like Cloudsdale. The events of Family Appreciation Day suggest in part that plenty of rainstorms form over wild, uncontrolled areas such as the Everfree Forest that then drift over Equestrian territory, leaving the weather a bit less scheduled than has previously been assumed. Of course that opens up a new question: are these natural rainstorms controllable once they enter Equestrian territory, or do they remain wild, still affected by whatever magics prevent Pegasi from controlling the weather that forms in places like the Everfree Forest?
The title of the episode suggests that there may be an enormous storm involved. Basically, a hurricane forms somewhere off the coast of Equestria, a true monster that requires every Pegasi available to participate and help control if they're to prevent it from destroying towns and cities along the coast. Something like that would involve a LOT of action and drama, which would be quite exciting.
And yet I'm not confident that's what will happen. The way the episode descriptive blurb is written, it seems more likely that we're looking at a smaller pattern of storms, like a seasonal monsoon that intensified to greater than normal in the area near Ponyville, which would still need plenty of Pegasi involved but that wouldn't quite be at the level of a massive hurricane. It would still involve higher than normal amounts of action and drama though.
This episode has a lot of promise. Fluttershy hasn't been getting the attention she needed to get this whole season, and now that she is I'm hoping she once again proves that she is capable of extraordinary feats when she's given the chance.