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.)
http://science.nasa.gov/headlines/y2007/images/undularbore/saylorville_timelapse.mov
--notes--As Beasley once observed : “If two independent systems, both having the same nature occurring frequency, are joined together in a harmonious phase, resonance occurs with the result that their maximum and minimum values are reached simultaneously, both systems vibrate in unison . Under these conditions, the resulting wave from the values created by the union of the two frequencies exceed that which either could produce independently. [1]
1. Beasley. 1978. Unknown source. From: http://sps.nus.edu.sg/~tanshenm/2171.pdf&ei=YTUeR5zBIYO0as_DuP4H&sig2=DPyKNNqHR7OR2NIG77v50Q&zx=-I_Kaexbuog&ct=w

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