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Red Sky at Morning...

An excellent page explaining the science behind that age-old rule of thumb about sailors and red sky can be found here. The basic idea is that high pressure areas of the atmosphere tend to contain a lot of "dirty" air (soot, dust, other particles), and low angle sunlight passing through dirty air experiences scattering such that mainly reddish wavelengths arrive at the observer. As a result: "Since it is morning you are looking east, and the red sky indicates that there is high pressure there. Because you are in the mid-latitudes, the high is moving eastward--away from you. That could only mean that a low, and very likely an associated storm, is moving toward you from the west. Sailor take warning!"

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Uploaded on January 9, 2013
Taken on January 9, 2013