In 2017 the horizontal resolution of the MOGM was increased from 17 km to 10 km at mid-latitudes. Results from trials of this change will be presented which include both a reduction in track forecast errors and intensity bias. Performance for high profile hurricanes such as Harvey, Irma and Maria, which occurred after the resolution change, will be presented.
The increase in resolution of the MOGM has accentuated the problem of over-deepening tropical cyclones which occurs on some occasions. It is expected that a coupled atmosphere-ocean model will have a positive impact on this. Trials are underway of a coupled version of the MOGM and initial results will be presented which show a further reduction in track forecast errors and intensity bias compared to the atmosphere-only model.