The Emergency Email & Wireless Network

This is a free public service that will notify you in case of emergency weather information, Homeland Security information, health alerts, and of your local emergency management.
All you have to do is go to the website, click on your area from the list and add your email address. You can repeat it for more than one area.
It says you can get notified by email, cell or pager.

http://www.emergencyemail.org/Default.asp