My 1st attempt at an internet feed, works fine, although I dont have the weather icons 100% tested as I was unable to find a definitive list of "weather conditions". (I will post an updated version some time in the future.)
This XCF pulls XML data from Weather.com for display on the TSU9400. It's been written to pull both current data on one page and the 5 day forecast on a second page. You will need to go to Weather.com and sign up for an XMLOAP account to receive a partner ID and license key. Enter this information on the labels provided on the hidden PARAMETERS page along with your zip code. You will also need to configure your Pronto to connect to your local wireless network. Enjoy.