StormWatch United States

Provides updated satellite, radar, and forecasts. Includes severe weather watches, warnings, and advisories.
http://www.earthwatch.com/STORMWATCH/SWUS2D.html

National Weather Service: Warnings Area

Immediate access to all available warnings for the United States, including tornado, hurricane, and winter weather warnings.
http://iwin.nws.noaa.gov/iwin/textversion/nationalwarnings.html

National Weather Service: Active Warnings

Current weather warnings and special weather advisories from the National Weather Service.
http://iwin.nws.noaa.gov/iwin/graphicsversion/bigmain.html

National Weather Service: Climate Prediction Center

Long-range assessment of weather threats, including drought, heavy rain, tropical systems and El Nino/La Nina events.
http://www.cpc.ncep.noaa.gov/products/predictions/threats/

National Weather Service: Storm Prediction Center

Provides updated severe weather information.
http://www.spc.noaa.gov/products/wwa/index.html

Weather Advisory Browser

Features current National Weather Server advisories, watches, and warnings.
http://weather.terrapin.com/

Wild Weather

Daily severe weather news around the world. Covers phenomena from hurricane season to nor'easters. Features a photo gallery, storm chasers, and links.
http://www.wildweather.com/

Disaster News Network

Timely disaster news and information.
http://www.disasternews.net

Extreme Temperatures

Recorded from hundreds of localities around the world.
http://www.mherrera.org/temp.htm