1:00 PM MDT, Thursday, June 14, 2018
We are likely to enter a period this weekend with cooler temperatures and a better chance for periods of clouds and thunderstorms across the central Rockies, including the Front Range region. The change might start out slowly Friday or Saturday and become more noticeable Sunday and Monday.
It should still be quite warm in most areas, but some moisture from the tropical Pacific will increase the chance of late day cloudy periods and some localized showers or thunderstorms. The pattern is an early taste of the Southwest monsoon.
A cool front from the north may arrive by late Sunday bringing in cooler weather. Cloudy periods late Sunday into early next week may be more numerous and there may be a late day period with more organized coverage of showers and thunderstorms on Sunday or Monday.