Photo of the Week
October 6, 2006
September 24, 2006 I happened to have my camera early in the morning
near the Physics Department at Warren Wilson College. I was thus
able to capture this spectacular view of the morning fog on the Warren
Wilson College Farm.
Morning fog is very common in the late summer/early fall. Usually
the fog is all-encompasing - obscuring everything in the valley with no
scenic views until the fog "burns" off. The fog on this late
September morning was unusual in that it was confined to a small area.
Fog consists of suspended water droplets. Each droplet is about
10 micrometers (1 x 10-5 m). The droplets are formed
from condensing water vapor when cooled below the dew point.
Clear nights allow the ground to cool below the dew point. The
reason that fog forms in late summer/early fall more than the spring
and mid summer is that the weather patters have generally changed to
much clearer air allowing the ground level air to cool at nights.
Not only are the cool nights responsible for more morning fog in the
early fall, but the leaves and vegatation are still transpiring,
releasing much water vapor into the atmosphere. (This is the suggestion
posed by my wife Vicki). The combination of high humidity and
clear nights, create more instances of fog.
Photo of the
published weekly during the academic year on Fridays by the Warren
Wilson College Physics
Department. These photos feature an interesting phenomena in
the world around us. Students, faculty, and others are invited to
submit digital (or film) photographs for publication and
explanation. Atmospheric phenomena are especially welcome.
Please send any photos to email@example.com.
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the Week Archive.
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