pointing finger animation

 Fog in San Francisco!

By Eric Muller

Topic:
Meteorology

Type of Web activity:
Getting data and activities from the Web

Materials / Software needed:
Depends on activity / Web browser

Grade Level:
5-12

Time involved:
One class period

Created:
July 1996

Updated:
July 2010


The Web Science Workshop lessons were created in cooperation with the Exploratorium Teacher Institute.

This site developed and maintained by Eric Muller.

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When warm Pacfic air cools, water vapor condenses to form a mist. When this mist is on the earth's surface it's called fog....and San Francisco has a lot of it.

Fog forms off the coast of San Francisco. Air in the coastal valleys of the Bay Area and the Central Valley of California heats up during the day. The air in these locations expand and rise. This displaced air must be replaced. Air is drawn in* from offshore where fog has formed. This fog travels through the Golden Gate. San Francisco just happens to be in the path of this "replacement air." The fog gets carried along as the air makes its way towards the hotter regions of the Bay Area.

Below are a some links that can be made into a lesson.

*Areas of higher air pressure tend to flow towards areas of lower air pressure.

 

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