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The Many Types Of Fog
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A PowerPoint Presentation
By: xxxx xxxxxxxx
Meteorology 170
Section 6980
Professor Dennis Whitford
November 19, 2007
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Fog
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What is Fog?
• Fog is a cloud that
forms at the ground
• Fog is composed of
visible water
droplets or ice
crystals
• Fog impedes
visibility, reducing it
to less than 3,000
feet
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Radiation Fog
• Radiation fog forms at night when the
earth’s surface releases the heat it has
absorbed during the day
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Ideal Conditions For
Radiation Fog Formation
• Radiation fog
forms on clear
nights when the
winds are calm to
mild (less than 5
knots)
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Valley Fog
• Radiation fog that forms in low-lying
areas is called valley fog
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Advection Fog
Vs.
Radiation Fog
Advection Fog
• Horizontal
movement
• Forms day or night
• Can form in winds
up to 15 knots
Radiation Fog
• Stationary
• Forms at night
• Can form in winds
up to 5 knots
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Sea Fog
• Advection fog is
common in coastal
areas, as well as
at sea
• Advection fog that
forms over the
oceans is called
sea fog
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Areas Prone To Advection Fog
• Advection fog is
common along the
Pacific Coast of the
United States
• Advection fog is also
common in the
Grand Banks where,
during the summer,
two out every three
days are foggy
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Fog Harvesting
• Advection fog can be beneficial
• Some countries harvest the fog for its
water content
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Upslope Fog
• Upslope fog forms when moist air is
gently pushed up a sloped area by mild
winds
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Areas Prone To Upslope Fog
• Upslope fog can
occur in any hilly
or mountainous
area
• One area where
upslope fog is very
common is the
eastern side of the
Rocky Mountains
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Frontal Fog
• Frontal fog , also known as precipitation
fog, forms when warm raindrops fall
through colder air masses
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Fog Stratus
• Fog stratus is the term used to describe
the layer of fog left when fog does not
completely lift
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Text References
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Image References
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Text Content
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