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Category: Winter weather

“Lake-effect clouds” in Montana and North Dakota

Even though very cold arctic air had invaded much of the north-central US  (minimum temperatures on the morning of 15 December were -33º F at Havre, Montana and -28º F at Bottineau, North Dakota), the deeper man-made lakes (created by dams) along the Missouri River remained unfrozen on 16 December... Read More

Mountain wave hydraulic jump over Colorado

A minor “high wind event” was noted in Boulder, Colorado on 01 December – 02 December 2008, when  winds gusted as high as 48 mph during the night-time hours. GOES-13 6.5 µm water vapor channel images (above) showed the formation of mountain waves clouds over the Foothills region of Colorado,... Read More