Contrail Expands And Twists Clouds During Fingerlakes Nys Sunset. Nephology Is The Science Of Clouds, Physics Branch Of Meteorology.undulatus Clouds Form Perpendicular To The Direction Of The Wind. More Specifically, A Lifting, Large Air Mass Spurs The Formation Of These Clouds, Which May Be Followed By Condensation And Possible Instability. Also, Pilots Recognize Undulatus Clouds As A Sign Of Wind Shear And May Create Slight Turbulence For A Flight. Undulatus Clouds Similar To Cloud Streets. Undulatus Clouds Form Perpendicular To The Wind, While Cloud Streets Form Parallel To The Wind. Or A Cirrus Uncinus Cloud, Mares’ Tails, With A Contrail. Contrails Are A Form Of Cirrus Cloud, And If There Is Enough Moisture In The Air, A Contrail Will Eventually Spread To Be Indistingushable From The Surrounding Cirrus.

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