Unlike other NCEP forecast systems which run continuously throughout the year, the hurricane models, e.g. both the HWRF and the GFDL 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 HWRF or GFDL 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 HWRF 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 HWRF runs, please go to NCO Tropical Guidance page