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Science Struck
Science Struck: Interpreting Barometric Pressure Readings
Explains how to read a barometer and interpret its meaning, as well as how the barometer was invented.
Other
American Meteorological Society: Data Streme Atmosphere
This site provides an extensive amount of weather information. Includes current information, forecasting, and historic weather related events. Weather map symbols and terminology explained.
USA Today
Usa Today Weather: Using Winds and a Barometer to Make Forecasts
Describes the ways in which wind direction and barometric pressure can be used by the amateur weather forecaster to make predictions about the weather.