Mary Anna (4 Apr 2011)
"Snow Moves In, Forces I-70 Closure DENVER (CBS4) - A blast of winter is barreling through Colorado Sunday, just one day after Denver experienced record heat. "

 
From a heat wave to a snow storm in one day???   How often does that happen?   When did it last happen?   End time sign? 

http://denver.cbslocal.com/2011/04/03/denver-weather/