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If you want severe weather alerts, extended forecasts, and doppler radar images then get the full version of MenuWeather. Just search MenuWeather in the Mac App Store! (Currently U.S. only)
MenuWeather makes checking the weather easier than it has ever been before.
Using new technologies in Mac OS X Snow Leopard, MenuWeather uses your internet connection to get your current location. Once MenuWeather has your location it will get the temperature and display it in your menu bar along with a small icon indicating the current condition in your area.
Clicking on the icon in your menu bar shows a menu displaying more detailed current conditions for your area along with a forecast for the next several days.
You can add any number of additional locations in MenuWeather. MenuWeather will also display a Growl notification whenever the weather changes (if you have Growl installed).
Features: