Unisys Weather Loopable surface map and an abundance of model data.
Real-Time Weather Data Good for satellite data. Also has radar, surface and upper-air observations, and model data.
Intellicast Local and travel forecasts for all over the world. Also presents interesting weather discussions by "Dr. Dewpoint".
The Weather Channel Weather news, radar, and local forecasts.
USWX Severe weather updates, radar, and satellite data.
JHU/APL Atlantic Hurricane Track Maps & Images Keep track of the tropics.
Historical Monthly Station Data from NOAA is available. You can search by location or by city name.
Analyses and Forecasts from the NCEP (NWS)