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A nice warm-up today The active pattern of recent times has kept us all on our toes here at BoulderCAST. As soon as one system exits, the next is already approaching. Despite the overall lack of much snowfall to show for it in Denver or Boulder, this has been the case for the last week or two. Fittingly, there is indeed …

We end the week on a cold note Highs this afternoon will be only in the lower 20's under partly sunny skies and a few snow flurries. The clouds are due to a system rotating in Arizona (below), which will bring several inches of snow to eastern Arizona and New Mexico. Winter weather highlights have been issued for that area. …

No real changes needed to the forecast today with light snow chances and colder temperatures knocking on our door. The GOES-East water vapor animation is shown below. I really like to look at this to check the health of a storm and see where it is actually located. Even in the initialization hour, the models can get this simple facet …

A calm Christmas Today will be a quiet day in the Front Range thanks to a small-scale ridge that is passing through ahead of our next storm system. You should be able to pick out the slight ridge in the 500 mb map below. The GOES-East water vapor loop has the center of the upper-low near Los Angeles this morning. …

A rather quiet day today across the nation. The upper level pattern is shown below. Overall, a zonal flow is evident, with the cold air up in Canada. Over Colorado, west northwest flow is present, spelling out a downslope pattern for highs to reach the upper 40s with lots of sunshine. We continue to watch the threats of snow on …

As mentioned in yesterday's post, we are watching a quick-moving storm system trekking southeast today from Utah. Below shows the upper-level jet stream pattern. A quick moving trough is centered over northern Utah. To the east of it, lift is present over the High Country and northeastern Colorado. Along with the upper-level forcing, there is a concentrated area of upslope …

We end the week with another mild day. Below shows the upper-level jet stream pattern across the western U.S. today. A strong southwest to northeast oriented jet from southern Nevada into Colorado is present, with winds at the core of the jet stream approaching 120 mph. The cross barrier flow over the continental divide is creating an upper-level ridge axis, …