Weatherdorks.com recommends the following:

Weather Sites
National Oceanic and Atmospheric Administration
Weather Underground
Citizen Weather Observer Program
AWEKAS Automatic Weather Map System
PWS Weather
HamWeather
Weather.com
Intellicast
AccuWeather
NOAA Weather Radio
SouthWestern Weather Network
Spaceweather
News Talk 1520 KVTA

April's Weather Data
April's Weather Station at Weather Underground
April's Weather Station at Citizen Weather Observation Program
April's Weather Station at AWEKAS Automatic Weather Station Map
April's Weather Station at PWS Weather

Earthquake Sites
United States Geological Survey
National Earthquake Information Center
Seismic Monitor
Southern California Earthquake Center
Nevada Seismological Laboratory
Seismo-Watch

Weather Forums
WXForum
WUHU Software
The Weather Vane
Accuweather Forums
Talk Weather
Weather Forums