The 2020 Blue Book, by list of authors |

01.Assimilation of atmospheric and land observations. Data impact and sensitivity studies. Methodological advances |

02.Data sets, diagnostic and dynamical investigations, statistical post-processing, reanalysis,and associated studies |

03.Computational studies including new techniques, parallel processing, GPUs. Effects of model resolution |

Author(s) | Paper title | Country | Pages |

K. Araki | Numerical Simulation of Heavy Rainfall Event Associated with Typhoon Hagibis (2019) with Different Horizontal Resolutions | Japan | 3-03 |

J. Wang, J. Whitaker, E. Hartnett, J. Abeles, G. Theurich, W. Meng, C. Martin, J.H. Alves, F. Yang, A. Chawla | Computational Performance Improvements in GFSv16 | US | 3-05 |

04.Parameterization of atmospheric and surface processes, effects of different physical parameterizations |

05.Development of and studies with regional and convective-scale atmospheric models and ensembles |

06.Developments in global forecast models, case studies, predictability investigations, global ensembles |

07.Global and regional climate models, sensitivity and impact experiments, response to external forcing, monthly and seasonal forecasting |

08.Development of and advances in ocean, sea-ice, and wave modelling and data assimilation |

Author(s) | Paper title | Country | Pages |

S. Flampouris, M. De Pondeca, R. Padilla, J. Carley | Upgrades to the NCEP's Real-Time and UnRestricted Mesoscale Analysis Systems for the Significant Wave Height | US | 8-03 |

Z. Garraffo, J.A. Cummings, S. Paturi, Y. Hao, D. Iredell, T. Spindler, B. Balasubramanian, I. Rivin, H.C. Kim, A. Mehra | RTOFS-DA: Real Time Ocean-Sea Ice Coupled Three Dimensional Variational Global Data Assimilative Ocean Forecast System | US | 8-05 |

J. Kim, G. Vernieres, S. Flampouris | Overview of Sea Ice Data Assimilation Activities and System Development at NOAA-NCEP | US | 8-07 |

F.A.Pogarskiy, I.I.Mokhov | Changes of sea waves characteristics in the Arctic basin from model simulations for the 21st century | Russia | 8-09 |

V.N. Stepanov, Yu.D. Resnyanskii | Covariance functions in multivariate assimilation system with ensemble Kalman filter | Russia | 8-11 |

09.Development of and studies with coupled and Earth system models and data assimilation systems |

10.Forecast verification: methods and studies |

Author(s) | Paper title | Country | Pages |

R. Danielson, W. A. Perrie, M. Zhang | An update on linear regression and error correlation: Exploration of baseline climate change impacts on Arctic and North Atlantic fog | Canada | 10-03 |

J.G.Z.de Mattos, L. F. Sapucci, C. F. Bastarz, A. Frassoni, W. Santos, A. Carrasco | SCANTEC: A Community System for Evaluation of Numerical Weather and Climate Prediction Models | Brazil | 10-05 |

L. Stefanova, J. Meixner, A. Mehra, P. Bhattacharjee, R. Grumbine, B. Li, S. Moorthi, Jiande Wang, D. Worthen | Verification of the NCEP/EMC Unified Forecast System for Subseasonal to Seasonal Timescales | US | 10-07 |

W. Wang, B. Liu, Z. Zhang, L. Zhu, A. Mehra, V. Tallapragada | Ten-year Performance of HWRF Model in RI Forecasts -- A New Metric | US | 10-09 |

Z. Zhang, J. Zhang, K. Wu, G. Alaka, A. Mehra, V. Tallapragada | A Statistical Analysis of High Frequency Track and Intensity Forecasts from NOAA’s Operational Hurricane Weather Research and Forecast (HWRF) Modeling System | US | 10-11 |