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T. Ghosh and T. N. Krishnamurti

nonlinear interaction for wind-wave spectra using ANN was examined by Tolman et al. (2005) . They found that their neural network–based interaction approximation provided reasonable results with a limitation of integration to models. Krasnoplsky et al. (2005) have developed a hybrid environmental numerical model by combining a deterministic model and an ANN model with improved results. Application of ANN in the estimation of ocean mixed layer depth was studied by Swain et al. (2006) . Jain et al

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

resolution, the SCDI–NAVGEM analysis provided an excellent intensity forecast to 36 h in terms of both the large magnitude and the constant trend. The upscaling of the SCDI analysis to NAVGEM also resulted in a better 24-h forecast of the inner-core surface winds and the size of the vortex (here the 18 m s −1 winds), which should lead to a better ocean surface wave forecast (not shown). This combination of a more accurate track, intensity, and vortex surface wind distribution is important for warnings

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Nannan Qin and Da-Lin Zhang

an intensification rate of greater than 15.4 m s −1 day −1 in V MAX , following Kaplan and DeMaria (2003) . In hindsight, Patricia’s strong intensity was expected, but not the degree to which it would intensify, and it did so rapidly ( Kimberlain et al. 2016 ), given its development in a very favorable environment with high sea surface temperature (SST), high ocean heat content, weak vertical wind shear (VWS), and ample low-tropospheric moisture ( Gray 1968 ; Holliday and Thompson 1979

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