The Tropical Prediction Center (TPC) performs extensive coordination during the course of preparing and transmitting a hurricane advisory.

The coordination falls into three categories:

1st - Hurricane Hotline Coordination
2nd - International Coordination
3rd - Emergency Manager Coordination

• "INTERNAL" COORDINATION ON THE HURRICANE HOTLINE
  The hotline is a closed-circuit telephone system connecting the TPC with other National Weather Service (NWS) national centers, NWS forecast offices, NWS river forecast centers, and several Department of Defense installations. This coordination call is made for every Atlantic advisory at two hours after the start of the advisory cycle.
  
  This coordination serves several purposes. First and foremost, it gives the other offices advanced notice of the contents of the upcoming advisory. This gives them time to create their own forecast and warning products, many of which are usually issued at about the same time as the advisory. Second, it is when the watches and warnings are coordinated between TPC and the local forecast offices. Third, other NWS national centers may have useful input on the forecast track, intensity, wind radii, rainfall, and tornadoes to provide during the call.

• INTERNATIONAL COORDINATION
  The TPC issues watches and warnings for the United States. However, the national weather services of the Caribbean countries, Central America, Mexico, Bermuda, and Canada issue watches and warnings for their own countries. TPC coordinates with these weather services on the cyclone forecasts and appropriate warnings.

• COORDINATION WITH EMERGENCY MANAGERS
  One way this occurs is through a briefing for federal, state, and local emergency managers held by the Hurricane Liaison Team (HLT) of the Federal Emergency Management Agency (FEMA). These briefings normally occur shortly after the advisory is issued. The TPC meteorologists involved in the briefing give an overview of the situation which helps the emergency managers make decisions regarding evacuations, transportation issues and resource allocation.
  
  A second method of this coordination includes both formal and informal conference calls with state and local emergency managers.