November 6, 2020 - Fog in the Canadian Rockies

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   Fog in the Canadian Rockies
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   As autumn nights lengthen and cool weather settles over the mountains,
   the chances of valleys filling with evening fog increase. In the long
   night, the atmosphere has more time to cool down and approach the dew
   point—the temperature at which the air becomes saturated and water
   vapor condenses into fog. Since cold air is denser than warm air, it
   sinks into low-lying valleys, meaning fog develops there first, while
   the higher mountain peaks remain in clear air. When valleys are filled
   with rivers, streams, or lakes, the process is amplified as these
   features provide a ready supply of water vapor.

   On November 2, 2020, the Moderate Resolution Imaging Spectroradiometer
   (MODIS) on board NASA’s Terra satellite acquired a false-color image of
   valley fog in British Columbia, Canada. This false-color image uses a
   combination of visible and infrared light to make it easier to
   distinguish between snow, fog, and cloud—all of which appear white in
   true-color images. In this combination, snow appears bright cyan, fog
   (low cloud) appears white, and higher, colder cloud appears pale cyan.
   The heaviest fog appears over lakes, including Upper Arrow Lake (east)
   and Okanagan Lake (west).

   Image Facts
   Satellite:  Terra
   Date Acquired: 11/2/2020
   Resolutions:  1km (110.5 KB),  500m (366.1 KB),  250m (1 MB)
   Bands Used: 7,2,1
   Image Credit: MODIS Land Rapid Response Team, NASA GSFC



https://modis.gsfc.nasa.gov/gallery/individual.php?db_date=2020-11-06
 
