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Shixuan Zhang and Zhaoxia Pu

72-h HWRF simulation. In addition, the adjustment of MSLP during the first 6-h forecast of RL-4D-TCI is not observed in RL-4DRES-TCI ( Fig. 10b ), implying that the high-resolution background error covariance and denser observational bin can possibly reduce the initial adjustment in HWRF after DA. Following Pu et al. (2016) , the net radial force field F , which is defined as the difference between the sum of the Coriolis and centrifugal forces and the radial pressure gradient force, is

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Russell L. Elsberry, Eric A. Hendricks, Christopher S. Velden, Michael M. Bell, Melinda Peng, Eleanor Casas, and Qingyun Zhao

appropriate SAMURAI wind increments. For each of these three domain 2 time steps, three time steps are taken on the 5-km domain 3 centered on the TC forecast position (both domains 2 and 3 are moved with the storm). In each time step on each domain, the mass fields will be adjusted to the SAMURAI wind increment forcing derived for that 15-min AMV dataset. Since the time steps for domains 1, 2, and 3 are 90, 30, and 10 s, the SCDI with 15-min AMV datasets will have 10, 30, and 90 time steps, respectively

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