How does this happen?!?!

So, this afternoon it was about 49 degrees outside. It is now, according to Weather Channel, 16 degrees (feels like -5 degrees). The winds are 34 to 41 mph and it is snowing like a blizzard out there! It's crazy! My windows are whistling like crazy, but I am sitting by a nice cozy fire watching t.v. :) And I'm secretly hoping for a snow day tomorrow, so keep your fingers crossed! :)