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After a slight cool down yesterday, we warm back up into the upper 80's this afternoon under full sunshine. There will hardly be a cloud out there today! Southwest winds could be breezy at times. As we detailed yesterday, a big cool-down is looming to our west as an autumn trough approaches! We'll be in the warm sector today and tomorrow, …

As you can see in yesterday's weather history graph below, the high temperature was 86 degrees. Nice and toasty for mid-September. The blue line shown at 6:00 PM last evening denotes the passage of a cold front. This will cool our temperatures today comparatively. Nonetheless, it will still be in the upper 70's with heaps of sunshine this afternoon. EPIC CHANGES …

It has been dry across the Metro area! Measurable precipitation has not been recorded at BoulderCAST Station since August 18th....33 days ago. The graph below shows a conglomeration of weather in Boulder sine January 1, 2016. Circled in red...note that monsoon season was much more brief this year compared to last summer. Though, the overall accumulated rainfall was more-or-less the same. With …

Another shortwave disturbance will be tracking through in the southwest flow later this afternoon and early evening. The top figure below shows a weak ripple tracking across northeast Colorado by 6 PM tonight. Coupled with this is precipitation that breaks out (below) across the High Country, Foothills, and Plains. We are expecting highs to top out near 70 this afternoon, …

Another system moves out today, while another one moves in overnight tonight and tomorrow afternoon. The cold frontal passage last night brought with it isolated thunderstorms, chilly air, and gusty northeasterly winds at the onset. For today, a shortwave system (top figure) is exiting the region into the Dakotas. Behind it, westerly mid-level flow ensues. This will aid clouds breaking …

A big change in the weather is taking shape later tonight as a strong cold front associated with a deep trough to our west brings down some of the chilliest air so far this season! As for today, though, we should see gorgeous weather to end our week with upper 70's to near 80 degrees under mostly sunny skies. Downslope …

Our mid-level winds turn westerly for today as opposed to northerly like they were yesterday. There is no upper-level forcing around, but we still think a few isolated afternoon showers will develop across the higher terrain and drift eastward onto the Plains, providing  spotty raindrops or rumbles of thunder.  Expect lots of sunshine this morning, with increasing clouds through the afternoon. Temperatures …