Combining Clouds
https://www.washingtonpost.com/weather/2020/02/25/two-rare-cloud-formations-combined-were-spotted-monday-over-mount-washington-new-hampshire/
The remarkable cloud spotted from the summit of Mount Washington in New
Hampshire on Monday morning was a hybrid combination of two rare cloud species:
the lenticular, and the Kelvin-Helmholtz wave cloud.
Lenticular clouds form when air is forced upward by mountains or other
orographic features, rising and cooling below its dew point. The then-saturated
air forms a cloud, which erodes as soon as air begins to sink downwind.
Temperatures at the time were in the lower 20s, with westerly winds gusting near
50 mph.
Monday mornings cloud formation near Mount Washington was extra special because
it also had a curlicue appendage protruding above it, a curled finger reaching
up to the sky. This was a lone Kelvin-Helmholtz wave cloud. They ordinarily
come in strings of waves, yet this one was content on its own.
https://OzReport.com/1582721409
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