If you have not seen it, check out the movie "The Day After Tommorrow" staring Dennis Quade. Whenever the weather in my area does an abrupt change -- and it does often (this last week included snow on the weekend, followed by temps in the upper sixties for two days followed by tornados & straight line winds for one day followed by an ice storm and temps in the teens today with temps in the 50's predicted for tommorrow) -- the movie pops up in the recesses of my mind. I still get the willies.