Tropical Cyclone Products

Public Advisory (TCP)
  • A plain-language interpretation of the JTWC warning bulletin.
  • Provides latest information on tropical storm/typhoon watches and warnings.
  • Issued at least every 6 hours when a tropical cyclone is expected to affect WFO Guam's Area of Responsibility with 48 hours.

  • Local Statement (HLS)
  • Specific forecast for each island under a watch or warning, including rain, wind, surf, storm surge, as well as recommended preparations.

  • Tropical Cyclone Update (TCU)
  • Bulletins providing users of significant changes in a tropical cyclone in between regularly scheduled public advisories
  • May include hourly estimates of the tropical cyclone position while within range (about 230 miles) of Guam's Doppler radar, normally if an eye is present
  • May provide other applicable information, including the acquisition and interpretation of significant new data (e.g. surface observation, radar, or satellite imagery)