If you want an idea of what is coming, here is the forecast for Denver, CO
In Denver it is to in the 60's today and then will drop 40 degrees with a high tomorrow in the low 20's.
Forecast for tomorrow: Tuesday:MUCH COLDER WITH SNOW! METRO DENVER: 6 TO 12 inches
FRONT RANGE FOOTHILLS: 10 TO 14 inches FORT COLLINS-GREELEY: 7 TO 14 inches
EASTERN PLAINS: 4 to 8 inches Morning lows are forecast to be from 17 to 22 degrees, afternoon highs from 19 to 24 degrees. Snow could be blinding at times in northerly winds at 20 to 40 mph.