Central Pacific Hurricane Center

The Central Pacific Hurricane Center (CPHC) is a division of the United States National Weather Service office in Honolulu, Hawaii. It is the Regional Specialized Meteorological Center responsible for forecasting tropical cyclones in the north central Pacific Ocean between 140°W and the International Date Line.

Advisories
The CPHC issues tropical cyclone warnings in various forms for use by mariners, aviators, and the general public. All tropical cyclone warnings are issued every six hours, and intermediate public advisories are issued every three hours if a watch or warning is current. Special advisories and discussions may be issued at any time if there are significant changes, such as rapid intensification.

Public advisory
Public advisories are issued for use by the general public and the media. They are written in a format that can be understood by people who are not familiar with meteorological terminology. Public advisories usually contain the following information:
 * Position (latitude/longitude and distance from a given landmark)
 * Maximum sustained winds in mph (1-minute average)
 * Minimum central pressure in mbar and inHg
 * Current motion

If a tropical cyclone is threatening land, advisories may contain such information as warnings and watches, storm surge, and potential rainfall or tornadoes.

Forecast/advisory
The forecast/advisory is a version of the public advisory written for use by mariners and the shipping industry. It contains the same information given in the public advisory, and also includes forecast points for 12, 24, 36, 48, 72, 96, and 120 hours from the advisory issuance time. Forecast/advisories also contain wind radius information for gale, storm, and hurricane force winds, as well as 12 foot seas. All wind and motion measurements are given in knots, and all distances are given in nautical miles.

ICAO advisory
The ICAO advisory is a special advisory written for the aviation industry, for the purposes of routing and safety. It contains the tropical cyclone's current position, maximum winds (in knots), minimum pressure (in hPa), movement, and forecast positions and winds for 12, 18, and 24 hours from the advisory time.

Forecast discussion
The forecast discussion is a detailed discussion of the state of the tropical cyclone, as well as a technical description of its current condition and environment and forecast reasoning. All discussions contain a table listing forecast positions and winds for 12, 24, 36, 48, 72, 96, and 120 hours from the issuance time.