The National Hurricane Center (NHC) is a division of The U.S. National Weather Service (NWS) and The National Oceanic and Atmospheric Administration (NOAA) that predicts, names, and tracks tropical weather systems. They issue watches and warnings during the Atlantic and northeast Pacific hurricane seasons, and make predictions on tropical weather outlooks for those areas.When a tropical storm or hurricane is possible within 48 hours, the National Hurricane Center issues a watch, indicating that storm conditions may occur in the area. When a tropical storm or hurricane is expected within 36 hours, the NHC issues a warning, indicating storm conditions are expected for the area. Watches and warnings are given by The National Weather Service and on NOAA Weather Radio All Hazards (NWR).