Interactive National Weather Service provides email and SMS weather bullitens for free.
Still experimental, the Interactive National Weather Service (iNWS) provides solutions to users who want to receive weather information from their mobile devices. Included in this service is the ability to receive weather bulletins via e-mail or SMS message in real time. The service continues to get better so I thought I'd pass the word around.
UPDATE: This is only for emergency services personnel and SKYWARN people.