The application running on the phone keeps track of the phone's location, not the Global Alert Network servers. When an alert is created, the alert zone is downloaded to the phone and the phone makes the determination if you are affected by the alert and whether the alert should be played.
Eton ARCPT300W American Red Cross Axis Self-Powered Safety Hub with Weather Radio and USB Cell Phone Charger. $70
A self-powered device that's designed to prepare you for the worst of situations, the Axis has everything you'd need in the event of an emergency, power outage or natural disaster. It has a variety of features that will help you whether you're on the road or at home without any power. It can be hand cranked or plugged into a laptop or AC adapter via mini-USB cable (included), or powered by three AAA batteries (not included).
The Axis is equipped with an AM/FM/NOAA weather radio. You can tune into a variety of AM/FM stations and seven preset NOAA weather channels. To access these stations select the AM, FM or WB (weather band) channels 1-7 with the band selector switch.
Tips on hurricane preparedness, storm surge, marine safety, with archives so you can track the past accuracy of storm forecasts.
The American Red Cross has an app called Shelter View that tells you what shelters are open and how close they are to capacity.
Disasterassistance.gov. After the storm is over, this free app from the government helps you locate and apply for relief.