Abstract: An active early warning system for storms that uses weather radar data as input to a computer which in turn projects the likely path of a tornado. The computer then accesses a database which contains telephone numbers and the telephone's geographic location. The phone numbers which are in the projected path of the tornado are dialed automatically and the called parties are notified via computer message. This provides individuals who are the most likely potential victims of a tornado with the earliest possible notification. By using geographic data which is related to the telephone number, the computer will not waste any time calling numbers which are not in the path of the tornado. This avoids unnecessarily alarming individuals who are not at risk and ensures that those who are at risk are notified.