In one embodiment, a system that stores information indicative of real-time locations of a wearable alert devices, receives information indicative of a potentially dangerous condition in a geographic area, determines which of the wearable alert devices are in the geographic area, and outputs alerts for transmittal to the wearable alert devices in the geographic area. In another embodiment, the system stores a user profile that associates a wearable alert device with a user and includes contact information for an emergency contact, receives information indicative of a real-time location of the wearable alert device and information indicating that the user of the wearable alert device is potentially experiencing an abnormal physiological condition, and outputs an alert for transmittal to the emergency contact that includes an indication that the user is potentially experiencing the abnormal physiological condition and the real-time location of the wearable alert device.