Here are links to

• The NOAA Wisconsin Page gives weather information from a big slick form, with an image map of the state for selecting local forecasts. I've had trouble getting the image map to work, though.
• local weather from WISC-3
• a wealth of global weather information from the University of Michigan Weather Machine
• weather, weather, weather from a friendly commercial supplier, Freese-Notis.
• AmericaWeather weather maps and forecasts

The city code for Madison, by the way, is MSN. Wisconsin is WI.