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Velocity White
Wave Clouds Roll Over Birmingham (newsy-allvideos)
Watch Video
(Image source: WBMA)
**BY STEVEN SPARKMAN**
Weird weather had an entire city staring at clouds during their morning
commute.
Last Friday, giant waves rolled past Birmingham, Alabama. But it's no tsunami
-- these are clouds. This rare event is a picture-perfect example of what
meteorologists call a Kelvin-Helmholtz instability. (Image source: WBMA)
Videos and photos of the curious clouds went viral this week. A meteorologist
for KTTV explains what we're seeing.
**"This type of instability is caused by velocity shear, which is a difference
in wind velocity across two different layers of air, causing these wave-like
formations. Another example: two layers, one being air, one being water, wind
blowing over calm water. Small ripples form on the smooth water surface, and
will amplify into small waves and white caps."**
So you've seen the same effect any time you've watched waves form over a windy
lake. But it's rare to see it in clouds along the ground, especially near a
big city. A writer for Life's Little Mysteries explains why.
**"Most of the time, the difference in wind speed and temperature between two
layers of the atmosphere is small, and so the fast-moving air on top 'simply
slides smoothly ...
WWE Velocity 2011 Week 2