For people in St Johns County, that means signing up for a new emergency alert system. As soon as you drive onto St. Johns County Emergency Management property, you're greeted with the question, are you storm ready? With the launch of its new alert notification system, St. Johns County officials want you to move fast. When neighbors sign up, they will be able to choose how they want to be notified. If neighbors receive a notification from Emergency Management, it will solely be in the event of a public safety emergency.