Dispatcher's
Weather related web links.
http://www.dispatcher.org/brief/adfbrief.html

Ogimet
Meteorological information for weather professionals.
http://www.ogimet.com/

Refdesk.com
Assorted weather links.
http://www.refdesk.com/weath1.html

World Meteorological Organization
Tell you everything you ever wanted to know about weather worldwide from typhoon warnings to global warming.
http://www.wmo.ch/index-en.html