Unlike other NCEP forecast systems which run continuously throughout the year, the hurricane models, e.g. the HMON and HWRF models, are launched for operational use only when NHC/JTWC determines that a disturbed area of weather has the potential to evolve into a depression anywhere over NHC/JTWC's area of responsibility. After an initial HMON or HWRF run is triggered, new runs are launched in cycled mode until the storm either dissipates, becomes extratropical, or degenerates into a remnant low. Currently, the HMON runs in NCEP operations four times daily producing 5-day forecasts of mainly track and intensity to meet NHC operational forecast and warning process objectives.

For the latest NCO operational HMON runs, please go to NCO Tropical Guidance page