Intellicast NEXRAD Data
   National USA radar image, map. Updates twice per hour. Links to other radar maps: Summary, Regional, Local NexRad, Storm Relative Mean Radial Velocity.
   http://www.intellicast.com/Local/USNationalStd.asp?loc=usa&seg=LocalWeather&prodgrp=NEXRADimagery&product=BaseReflectivity&prodnav=none&pid=none

Live Weather Images
   NEXRAD images directly from the National Weather Service covering the United States.
   http://www.weatherimages.org/radar/

Plymouth State College NIDS Data
   Free and regularly updated NEXRAD radar data. All NEXRAD sites are available on the site and several radar modes are offered as well including Base and Composite Reflectivity, Base and SRM Radial Velocity, VIL, and Storm Total Precipitation.
   http://vortex.plymouth.edu/

Weather.Net by Freese-Notis Weather
   InterRAD Internet based doppler radar service, GPS based NEXRAD, advanced software since 1994.
   http://www.weather.net/

WeatherMatrix Radar Supersite
   The WeatherMatrix organization, formerly CASI, has put together a nice collection of radar-related links. The links range from those to current radar data, to links about radar sites and how they work. StormMatrix, a very unique feature to the Internet, i
   http://www.weathermatrix.net/radar/

WeatherTAP
   Commercial site offering NexRad Doppler Radar maps, updated every 6 minutes, including national, regional and state radar maps, and lightning strike data.
   http://www.weathertap.com/unprotected/static/services_about.html