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by © Corbis. All Rights Reserved. - © NASA/Corbis
Polar Cyclone
29 Apr 2009 --- It took the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA's Terra satellite a full five minutes to fly over this expansive cloud pattern on April 29, 2009. The sprawling "S"-shaped swirl is actually two cyclones that seem to be feeding on each other. Polar cyclones often form as a result of low-pressure systems over the ocean, and usually bring winds and heavy snow. Jeff Schmaltz, MODIS Land Rapid Response Team, NASA GSFC --- Image by © NASA/Corbis



























