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Changes in the tropical cyclone analysis are notable, with the cyclone structure defined in a better way. At forecast day 1 there is a marginally significant improvement in position error; the improvement is undetectable thereafter. Tropical cyclone intensity (as measured by central pressure) is slightly reduced from day 2 onwards: for lead times beyond four days this has a beneficial effect since it reduces the existing negative bias in tropical cyclone central pressure in such forecasts. You can find statistics on the Cycle 43r3 tropical cyclones forecast performance in TCPerformance_43r3_43r1.pdf.
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