Thursday, June 13, 2019

Day Seventy-Five: I Became Fascinated by Clouds


These clouds, seen yesterday, look as though they are 
spinning out slender arms in all directions. 







One of these clouds came with an 
accompanying line of smaller clouds, 
in formation like ducklings following a parent. 









Others were fanning out and trailing streaks of cloud. 




  The temperature was in the mid-nineties (a record-breaker).  

Later, at home, I checked and these might be cirrus clouds.

Fall streaks form when snowflakes and ice crystals fall from cirrus clouds. The change in wind with height and how quickly these ice crystals fall determine the shapes and sizes the fall streaks attain. Since ice crystals fall much more slowly than raindrops, fall streaks tend to be stretched out horizontally as well as vertically. Cirrus streaks may be nearly straight, shaped like a comma, or seemingly all tangled together. 

 http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/cld/cldtyp/hgh/crs.rxml

Photos taken with an iPhone near Sherwood OR.

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