Author

Sergey Frolov

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Preprint Aug 2026

Long-window 4DVar for reanalysis using a differentiable weather model

Atmospheric reanalyses combine observations with model forecasts using complex data assimilation systems. We test whether a differentiable weather model permits a simpler and more accurate method based on a long-window four-dimensional variational data assimilation (4D-Var) formulation that omits the conventional backg...

Gregory J. Hakim, Jeffrey S. Whitaker, Bo Huang et al. · 0 citations

Preprint Aug 2026

Bridging short- and medium-range weather forecasting with machine learning

The National Oceanic and Atmospheric Administration (NOAA) employs independent prediction systems for distinct forecast products. While some separation is practical, we argue that combining short- and medium-range weather into a single prediction system would provide the public with a useful distillation of global weat...

Timothy A. Smith, Mariah Pope, Sergey Frolov et al. · 0 citations