Subj : ES Picture of the Day 22  2022
To   : All
From : Dan Richter
Date : Tue Nov 22 2022 11:01:00

 EPOD - a service of USRA

The Earth Science Picture of the Day (EPOD) highlights the diverse processes
and phenomena which shape our planet and our lives. EPOD will collect and
archive photos, imagery, graphics, and artwork with short explanatory
captions and links exemplifying features within the Earth system. The
community is invited to contribute digital imagery, short captions and
relevant links.


 Dust Devils on a Dry Lakebed

   November 22, 2022


    Dust-devils
   Photographer:  Dale Chadwick
   Summary Author:  Dale Chadwick
   The photo above shows  dust devils on a dry lakebed southwest of
   Winnemucca, Nevada, as observed in the early afternoon of July 4, 2022.
   I was about 2 to 3 miles (3-5 km) away from when I noticed dust and
   sand swirling in the air. The largest of these devils appears to be
   over 100 feet (30 m) high and perhaps 30 feet (9 m) in width. I was
   surprised at how long they persisted -- visible for at least 10
   minutes.

    Dust devils occur when the surface becomes sufficiently heated to
   form a weak  updraft in the lower atmosphere, just above the ground.
   Once formed, the little rotating column of air may twist
   counterclockwise or clockwise and is typically barely strong enough to
   lift grains of sand.

   Photo details: Two views taken with a 300MM zoom lens.

   Winnemucca, Nevada Coordinates:


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Atmospheric Effects Links

     *  Atmospheric Optics
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     *  Refraction Index
     *  Image Gallery: Atmospheric Effects
     *  What is a Rainbow?

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   Space Research Association.

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