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Last updated on April 20, 2014 at 8:28 EDT

Latest Undular bore Stories

2008-03-24 01:56:49

Atmospheric waves that ripple through clouds could spin up tornadoes when a thunderstorm gets in the way, new research shows. Tornadoes generally form in the late spring when warming temperatures make the air unstable (though they've been known to pop up at other times of the year). The classic tornado-forming scenario features a layer of warm, moist air trapped under a layer of cold, dry air. If this balance is upset, say by warming at the surface, the moist air rises, cools and...

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2007-10-17 08:02:41

Pop quiz: define undular bore. If your answer included words such as dull or tiresome, i.e., boring, think again. Or better yet, click on the image to see an undular bore in action: Undular bore waves over Iowa, Oct. 3, 2007. Movies: 5 MB mov, 5 MB gif, 13 MB gif. Those giant waves"”"undular bore waves""”were photographed Oct. 3rd flowing across the skies of Des Moines, Iowa. (Credit: KCCI-TV Des Moines and Iowa Environmental Mesonet SchoolNet8 Webcam.) "Wow, that was a good one!"...