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In recent years various regional configurations of the MetUM have also been set up and run over areas that experience tropical cyclones some on an ad hoc basis and some running regularly in real time. These models have been run at a resolution of 17 km in the horizontal with 38 vertical levels. By Spring 2010, one such model (covering the North Indian Ocean) will be running at 12 km resolution and with 70 levels.
This paper will review the impact of resolution on forecasts of the track and intensity of tropical cyclones and severe tropical rainfall events in both the global and regional configurations of the MetUM. It will also explore how changes to data assimilation techniques and physics tunings combine with resolution changes to impact on the forecast performance.
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