Earth Imaging Journal: Remote Sensing, Satellite Images, Satellite Imagery
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On April 14, 2013, NASA’s Terra satellite observed a striking cloud formation extending more than 600 miles from the California coast out across the Pacific Ocean. The cloudbank hugged the coastlines of California and Baja California, spanning hundreds of kilometers north to south and east to west.

Within the cloudbank was an arc of mostly clear sky. Curving toward the southwest, the arc extended more than 1,000 kilometers (600 miles) over the Pacific Ocean.

Bob Cahalan of NASA’s Goddard Space Flight Center explains that the cloudbank consisted of stratocumulus clouds, and the arc was probably a wake caused by an obstacle to air flow, perhaps San Clemente Island. Islands that are tall enough can easily interrupt air flow over the ocean, and when clouds are present, they make such disruptions visible in photo-like imagery.

Image courtesy of NASA.

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