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The North Australia Metocean Study (NAMOS) is a Joint Industry Project (JIP) that responds to the need for an assessment of the extreme wind and wave climate offshore North and Northwest Australia, which is largely associated with tropical cyclones. The original NAMOS JIP consisted of 77 top-ranked tropical cyclones from the northwest shelf subregions of Carnavon Basin and Timor Sea/Browse Basin. To expand the population of storms, track-shifting was imposed on all of the storms with an average of 9.45 shifts per storm. Later, Phase 2 increased the number of nominal storms to 124 and the number of shifts to an average of 14.66 shifts per storm. The most recent update was completed in late 2014 and addressed 160 tropical systems from the period 1970-2013. NAMOS is archived every 15 minutes on a 7-km grid with Spectra archived at 777 locations.

NAMOS-II is a secondary JIP that concentrates on extra-tropical cyclones primarily from 3 regimes: easterly trade wind intensifications, westerly trade wind enhancements, and long period swell imported from intense extra-tropical cyclones that migrate across the Southern Indian Ocean. Nearly 200 events were chosen for this hindcast between 1979 and 2013 and archived 1-hourly on the same NAMOS grid. Spectra are available at 784 locations.

Participants who join both the NAMOS and NAMOS-II JIPs are eligible to join NAMOS-Comp. This latest JIP combines both storm populations into a long-term, comprehensive, uniform operational hindcast for the period 1979-2013 and is archived 1-hourly. Spectra are available at 796 locations.

GROW-Fine_NW_Australia (GFNA) addresses the need for day-to-day continuous operations. It is the only portion of the NAMOS project that is available for purchase by the grid point for non-JIP participants. It is available in in bulk for JIP participants only. GFNA used the same 7-km grid system, but the final archive ends east of 131E. The hindcast is archived 1-hourly from 1999-2009.


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  • Time series of wind and wave parameters in ASCII or OSMOSIS format
  • Return period extremes for wind speed, wave height (significant, maximum and crest) and wave period (NAMOS/NAMOS-II)
  • Directional wave spectra
  • Operability statistics expressed as monthly and annual frequency-of-occurrence tables and persistence/duration statistics (GFNA)
 

 

For more information please contact oceanwx@oceanweather.com

 

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