MSGID: 1:317/3 640f64aa   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
   March 13, 2023 - Cloud Streets and Sea Ice off Eastern Greenland   
      
      Sea ice   
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      Despite the approach of spring, with lengthening days and warming   
      temperatures, on March 10, 2023, the Moderate Resolution Imaging   
      Spectroradiometer (MODIS) acquired a true-color image of a very wintery   
      scene across eastern Greenland. The combination of snow, sea ice, and   
      cloud streets is a hallmark of frigid, windy days.   
      
      The rugged terrain of central Greenland’s central coast is covered with   
      ice, snow, and glaciers. The edge of the land itself has been marked   
      with a gray boundary line, making it easier to see where the land ends   
      and fast ice (ice which clings to the land) begins. In some areas, the   
      sheet of fast ice is broken into chunks or, where it is starting to   
      melt and becoming waterlogged, takes on a gray appearance.   
      
      Just past the edge of the ice, clouds line up in parallel rows that arc   
      to the southeast. Called “cloud streets”, because they look something   
      like giant highways crossing the sky, this feature is formed when   
      strong winds blow across a frigid surface and then over warmer waters,   
      especially when a warmer air layer (a temperature inversion) rests over   
      the top of both. The comparatively warm water gives up heat and   
      moisture to the cold air, leading columns of heated air (thermals) to   
      rise through the atmosphere.   
      
      The warm air in the temperature inversion acts like a lid such that the   
      moist, rising thermals hit the air mass above and roll over on   
      themselves. This creates parallel horizontal cylinders of rotating air.   
      On the upward side of the cylinders (rising air), the moisture cools   
      and condenses into flat-bottomed, fluffy-topped cumulus clouds that   
      line up parallel to the direction of the wind. Along the downward side   
      (descending air), clouds remain thin, creating the thick-thin-thick   
      cloud pattern, as seen in this image.   
      
      Image Facts   
      Satellite:  Aqua   
      Date Acquired: 3/10/2023   
      Resolutions:  1km (683.7 KB),  500m (1.8 MB),  250m (3.7 MB)   
      Bands Used: 1,4,3   
      Image Credit: MODIS Land Rapid Response Team, NASA GSFC   
      
      
      
   https://modis.gsfc.nasa.gov/gallery/individual.php?db_date=2023-03-13   
       
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