MSGID: 1:317/3 62c47c4b   
   PID: hpt/lnx 1.9.0-cur 2019-01-08   
   TID: hpt/lnx 1.9.0-cur 2019-01-08   
   July 5, 2022 - Gravity Waves and Dust over the Red Sea   
      
      Gravity Waves   
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      Throughout most of the month of June 2022, strong winds carried dust   
      from the Sahara Desert over the Red Sea, sometimes creating a heavy   
      blanket of airborne dust more than 1,000 km (620 mi) wide. On June 30,   
      when the Moderate Resolution Imaging Spectroradiometer (MODIS) acquired   
      a true-color image of the relentless storms, the dust had thinned. But   
      it had also acquired a peculiar appearance, with many parallel lines   
      stretching across most of the Red Sea dust.   
      
      These lines were most likely caused by gravity waves in the atmosphere,   
      a type of turbulence caused by wind shear. As hot, dusty desert air   
      move across the cooler, moist waters of the Red Sea, the lower layers   
      of the air are slowed down, causing ripples in the atmosphere. These   
      ripples are a lot like waves we can see moving across the surface of a   
      lake—undulating up and down to create crests and troughs. The same   
      motion often happens in the atmosphere, but waves can’t be seen when   
      the air is clear. But when clouds are either cloudy or dusty, the   
      gravity waves become visible. In this case, the motion of the air over   
      the Red Sea is sorting the dust into bands as the atmosphere rolls   
      along with the motion of the wind over the water.   
      
      Image Facts   
      Satellite:  Aqua   
      Date Acquired: 6/30/2022   
      Resolutions:  1km (257.5 KB),  500m (620.5 KB),  250m (303.8   
      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=2022-07-05   
       
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