A magical storm in Hogsmeade that goes beyond "oh no it's snowing in the summer". It's unpredictable (and avoidable if people don't want to thread with it) and changes all the time. One day could be clear, and the next day you have wind gusts so powerful it breaks windows and knocks down the candles inside, setting random houses ablaze. Flash flooding that seems to disappear the minute it hits a large structure, but washes away residents who get stuck in its path. Earthquakes that open up to a crack, but instead of falling down into the ground you seem to fall down until you're back where you began. Thunderstorms that blare annoying music instead of thunder, waking everyone up at night. Snow, except it's really cobwebs and covers the entirety of Hogsmeade.

You know, the usual.