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This document discusses the significant improvements in the deterministic 10-day medium-range Integrated Forecast System (IFS) at ECMWF over the past 25 years. Highlighting the transition from T106 (approximately 125 km resolution) in 1987 to TL511 (approximately 39 km resolution) in 2000, it focuses on the introduction of a nonhydrostatic model (NH) and its impact on dynamic coupling. Understanding these developments is crucial for advancing numerical weather prediction and improving forecast accuracy.
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