It's one of my favorites! The idea of seeing future events before they happened is something of a sci-fi staple and is well-applied, even though we're left to guess what the mystery tornado thing is or wants or why...
...which might be deliberate and the (fan theory?) that Q behind it, on reflection, makes more sense that it's
not addressed on screen because saying too much could backfire and seem hokey. But adds highly probable circumstantial evidence that Q is constantly testing them but without use grandiose theatrics to announce his presence! Which is a partial shame as I
adore grandiose theatrics... Troi can sense Q nearby if close, or said she could early on but since season one she's never said a peep while realizing everyone else would have figured it out. Or did a deal with him so she plays poker face, now there's a fun novel to sew up canon for Peter David to write...

But Troi being mum aside, maybe the Q figured out how not to be noticed by telepathic beings, which falls back into her not saying a peep.
It's a lovely excursion into Picard's mindset as well as getting some tidbits out of the crew and the sense of mystery and worry over what they're about to stumble across are palpable and intriguing, without being overbearing or out of proportion.
Evolution is another top tier episode as a whole (IMHO). It starts out the season rightly enough, proving at the very start we're watching something radically different yet is the same show. still has sci-fi concepts, takes a dramatic turn that for now has balance, and looks so much more lush - even the beige hotel in space has more of a panache. And it only gets better. At least for the episode after its introduction where some major and majorly cool action we'd expect from an exploratory show with a flagship happens, and throughout the next couple of seasons... I'm surprised the newly sentient nanites didn't kill Dr Stubbs, or "Stubby" as they doubtlessly nicknamed him (something TNG would not do but Orville might), but then we'd get a third of the story devoted to "Nanites are like children"/"Yes but when the child throws a tantrum you don't kill it even though it tried to kill you" exchange like from ST : TMP...