Multi-day cold wave next week

12:30 PM MST, Fri, November 7, 2014.

You know how there is usually that one weather event every autumn that signals the arrival of the “winter” season? We’ll see that next week.

A long duration period of generally cloudy, unsettled weather and below average temperatures arrives Monday and is likely to persist all week for the Front Range, eastern Colorado, and southeastern Wyoming. It may not be here in full force Monday morning, but by Monday evening we are likely to enter a stretch where daytime temperatures remain near of below freezing even in the lower elevations, and nights may dip to the teens or lower. Western Colorado won’t see the change as dramatically.

I don’t expect a major snowfall with this cold snap, but widespread minor accumulations are probable across the Front Range and eastern plains beginning Monday. In fact, this is the type of setup that could result in areas of freezing drizzle and fog along the Front Range by Monday night or Tuesday.

So after a slight chance of minor precipitation tonight, enjoy the mild autumn weekend. It should be a good time to do that final autumn cleanup in the yard and make sure your house and car are ready.

For the weather weenies on the blog, this cold snap is the result of a weather pattern shift to a strong negative arctic oscillation. It was triggered at least in part by the remnants of the Pacific’s super typhoon Nuri that helped create an unusual surge of warmth into the arctic near Alaska. The anomalous poleward surge of warmth in the Pacific will be compensated by a southward surge of polar air in the eastern 2/3 of the United States.

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