National Hurricane Center (NHC) and local weather information, forecast tracks, and evacuation time calculations can be plotted manually, but this can be an onerous task during an emergency. A computer program called HURREVAC automatically tracks this information and displays the results graphically (shown below). The computer program can be obtained from county, local, and state emergency management offices. HURREVAC updates current and forecast storm data and then displays the track of the storm in various formats. Using HES data, it derives the potential for storm surge and calculates evacuation times based on storm speed and intensity. It can also be used as a "what-if" tool to help emergency managers determine courses of action for different storm characteristics.