Official United States Weather Bureau source for weather maps and forecasts. Contains forecasts, maps, warnings, data, current conditions, and storm warnings.

Find background about Groundhog Day and the folklore involved. Look through the charts that show how closely Punxsutawney Phil's predicitions align with the actual weather.

A look at the weather, how it is measured, and how it is caused. Learn what weather is like all over the world, how global warming is affecting our planet, and how "extreme" conditions like hurricanes, tornadoes, floods, and drought...

This resource talks about how the stations report their information. Several examples of how different universities compile the information are provided.

The National Oceanic and Atmospheric Administration (NOAA) sponsors this El Nino and La Nina resource site that features current and historic information about these weather systems with diagrams.