MSGID: 1:317/3 63a5ed1c   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
   December 23, 2022 - Fog in the Central Valley   
      
      Fog   
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      Thick fog frequently fills California’s Central Valley in late fall and   
      winter, often creating a risk for drivers as visibility plummets. The   
      Moderate Resolution Imaging Spectroradiometer (MODIS) on board NASA’s   
      Terra satellite acquired a false-color image of a huge bank of fog on   
      December 15.   
      
      In this type of false-color image, infrared and visible light (MODIS   
      Bands 7,2,1) are combined to help separate snow, which appears electric   
      blue, from cloud and fog. Fog and most clouds look bright white,   
      although high, cold clouds which contain ice crystals, may be tinted   
      with electric blue. Vegetation appears green, open land looks tan,   
      while water shows up as inky-black.   
      
      The formation of fog requires three ingredients: wet ground, still air,   
      and cold temperatures. Conditions are ripe after the ground has become   
      damp from a recent rain. During the day, the warmth of the Sun causes   
      the moisture to evaporate into the air. After sunset, air temperature   
      slowly drops. Because cool air can hold less moisture than warm air the   
      many tiny moisture droplets suspended in the air during the day combine   
      into large droplets, creating “low cloud”, or fog.   
      
      The Central Valley winter fog, also called Tule (too-le) tends to   
      form—often rapidly— after sunset, become thickest just before dawn,   
      then slowly thins as air warms in the morning. Tule fog season   
      typically begins in December and ends in February.   
      
      Image Facts   
      Satellite:  Terra   
      Date Acquired: 12/21/2022   
      Resolutions:  1km (474.1 KB),  500m (1.1 MB),  250m (684.2 KB)   
      Bands Used: 1,4,3   
      Image Credit: MODIS Land Rapid Response Team, NASA GSFC   
      
      
      
   https://modis.gsfc.nasa.gov/gallery/individual.php?db_date=2022-12-23   
       
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