I don't know why, but every time I have to go somewhere in the winter the weather always turns awful. I know, I live in Colorado and should expect that. Even back a zillion years ago in California, it was the same deal. I'd look at the long range forecast, book a trip to somewhere like Reno, then the weather pattern would abruptly change and there's suddenly two feet of snow in the forecast.
So, off I got to Denver today for a medical appointment. The forecast was fine when I made the appointment. Now, I'm likely driving through a blizzard.