NASA: Blog - US - Mammatus Clouds over Oklahoma - June 2013
Posted by Ricardo Marcenaro | Posted in NASA: Blog - US - Mammatus Clouds over Oklahoma - June 2013 | Posted on 13:23
Mammatus Clouds over Oklahoma
May 24th, 2013 by Adam Voiland
Earth Observatory reader Warren Bonesteel sent us this shot of mammatus clouds over Duncan, Oklahoma, on May 20, 2013. They were taken at about 7:00 p.m. CST, a few minutes after a large supercell storm
passed. The same storm system spawned a violent tornado that devastated
the nearby city of Moore. While most clouds form in rising air and have
flat bottoms, mammatus clouds have pouch-like protrusions caused by
sinking air that hang on their undersides.
Mammatus clouds can only form if the sinking air is cooler than the
air around it. The sinking air must also have high water or ice
content. Though they are often associated with thunderstorms, the
clouds are harmless and usually form in pockets of turbulent air after
the worst of a storm has passed. They are not an indicator that a
tornado is about to hit. You can learn more about mammatus clouds from Astronomy Picture of the Day, Earth Science Picture of the Day, AccuWeather, CBC News, EarthSky, and UCAR.
Did you have other dramatic shots of this storm system that you would like to share? Please send them to adam.p.voiland@nasa.gov. I’ll add the best of what we receive to this post.
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Updates:
The photo below was taken on Sunday May 19, 2013, by Darren Purcell. It was taken in advance of the storm that hit Norman, Oklahoma.
NASA: Blog - US - Mammatus Clouds over Oklahoma - June 2013
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