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- W2955632353 abstract "Abstract The prediction of tropical cyclones (TCs) in the western North Pacific (WNP) and the Philippines Area of Responsibility (PAR) has been explored in the Met Office (UKMO) global forecasting system over a 10-yr period at 0–7-day lead times. Both the high-resolution deterministic and lower-resolution ensemble systems have been considered. Location errors for verification against the observations are comparable for the deterministic, control, and ensemble mean forecasts; however, the ensemble spread indicates the ensemble is underdispersive. Intensity error metrics, for pressure and surface winds, show large biases relative to the observations, with the smallest biases for the deterministic system. For the intensity metrics the ensemble spread shows the ensemble is severely underdispersive primarily due to the large errors relative to the observations. Verification against the analyses shows similar results to verification against the observations for location. This is also the case for the intensities albeit with smaller errors and less underdispersion. The PAR region has larger intensity errors and biases and larger intensity ensemble spread compared with the broader WNP region. Forecast errors for location and intensity have reduced significantly with system upgrades over the period studied (2008–17) for the deterministic and ensemble systems. Intensity errors for the latest configuration of the deterministic system at day 4 are smaller than the initial errors of all the earlier configurations for both pressure and winds. The Madden–Julian oscillation (MJO) and boreal summer intraseasonal oscillation (BSISO) significantly affect the intensity forecast errors, but not the location errors. Intensity errors are lower at the initiation and for early lead times of the forecasts started in phases 6–7 and 7–8, when the MJO and BSISO are active in the WNP. These reduced errors appear to result mainly from the variations in intensity of the observed storms with MJO and BSISO phases, though the initial states of the forecasts are also affected. Over the studied period, the European Centre for Medium-Range Weather Forecasts (ECMWF) deterministic and ensemble systems have lower errors and biases for both location and intensity than the UKMO forecast systems." @default.
- W2955632353 created "2019-07-12" @default.
- W2955632353 creator A5043415290 @default.
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- W2955632353 date "2019-08-26" @default.
- W2955632353 modified "2023-09-26" @default.
- W2955632353 title "Prediction Errors of Tropical Cyclones in the Western North Pacific in the Met Office Global Forecast Model" @default.
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- W2955632353 doi "https://doi.org/10.1175/waf-d-19-0005.1" @default.
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