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TANGERINE SUNSET (12.7.06) |
That white cloud in front is your straight up cumulus cloud, formed by orographic ascent in the foothills west of Boulder, Colorado. The tangerine cloud layer behind it are altocumulus and, depending on your meteorologist, altostratus - "alto" denoting that they are midlevel clouds. These particularly altocumulus/stratus beauties were formed yesterday by moisture coming in all the way from the north Pacific. The colors come from the shorter, more blueish wavelengths of light being scattered as they pass through the atmosphere and clouds, which leaves the longer, more reddish wavelengths to highlight the late afternoon sky. (Special thanks to NOAA weather wizard Mike Kay for the excellent cloud info.)
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