Soap bubble, as frost overtakes it's surface...

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Until just a few years ago, these birds were unheard of in the central interior of Alaska. In recent years, the last 10 or so, they are showing up; more and more, and surviving to raise families.

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Kelvin-Helmholtz wave clouds are manifest from two different velocities... an unstable cloud experiences one velocity, the air rushing over the surface is moving at another velocity, and this instability creates waves in the 'interface'.

The same thing occurs to create waves on water; the water moves with one velocity, the air with another, and waves are created in that water/air interface.

Kelvin-Helmholtz instability waves in clouds however, are fairly uncommon, and typically a very short life span, mere seconds. This is only my third sighting in my life, and not really a very pronounced one.

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On the way home, looking over my shoulder one more time....

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... or late winter? Feels like winter, temperatures barely break the zero mark (Fahrenheit) in the heat of the day.

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