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Assimilation of data from AIRS for improved numerical weather prediction

Observations from the Atmospheric Infrared Sounder (AIRS) are assimilated into the Met Office’s Numerical Weather Prediction (NWP) model. The processing methodology is described with emphasis on cloud detection and quality control. The impact of the AIRS observations is an improvement in forecast skill of 0.5-1.0% which is a satisfactory result given the conservative nature of this initial implementation. Future improvements that might fully exploit the potential of advanced infrared sounders are discussed.