Temperatures in the foothills west of Fort Collins are thirty degrees warmer than in the city.
a chinook in the foothills, but over Ft Collins? We see that in Alberta.
There is no wind.
I was going to say Chinook as well – but you kind of need wind for that.
Urban heat island effect?
Mr. Watts ran a story about Oak Ridge Laboratories running an experiment. Concrete jungle strikes again. Here’s that link
Probably radiational cooling. Light or no wind with clear skies will drain the cold air into the lower lying sections often having big temperature differences from nearby areas. The foothills probably had either cloud cover or some wind. A 30 degree difference does seem a little extreme however. If the foothills also had clear skies and no wind I would agree that this is weird and would be curious as to the reason.
Fort Collins seems to be right on the edge of the cold air mass in the midwest, and has been running much colder than nearby areas the last couple of days.
Hmmm, up here in Wyoming we are in a heat wave, mid 40s with lots of wind.
That “29” station looks like it is CIRA (Cooperative Instittute for Research in the Atmosphere), where I worked 20 years ago (and first experienced for myself the incompetence of modern scientists–ones with EPA ties and continuing government grants).
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