Doug,
As you shop for graphics to include on your site, keep aware of the Terms of Service regarding images/data on the source site. Generally, anything on NOAA sites is free to use. Wunderground graphics are ok if you are a Wunderground member and you credit the source of the graphic.
Weather.com, AccuWeather.com, IntelliWeather.com all have much more stringent reuse (or no-reuse, even with attribution) requirements -- be careful that you don't violate their copyrights.
Best regards,
Ken