11:45 AM, Friday, May 11, 2018
A large (but not very strong) storm system to the west of Colorado and a cool air mass to the northeast of the Front Range will make for a cooler weekend and maybe wet at times. The storm will probably never move through the Front Range region, but will instead weaken in place over the next few days. The circulation around it will draw low level moisture to the Front Range from the Great Plains.
The most likely result for the Front Range region is for a few periods of clouds and some showers and thunderstorms mainly in the afternoon and evenings. The chance for rain is small today but will increase a little Saturday afternoon through Monday. Up in Cheyenne the chance for rain and thunder is greater today than for most of the Front Range.
There is a small chance that a low level surge of moisture from the east will result in solidly overcast a damp conditions for a 1/2 day to a day this weekend for the eastern foothills and high plains.
West slope areas should be drier despite being closer to the storm system.