Influence of humidity profiles derived from GOES imagery in the Canadian forecast model

Louis Garand; Jacques Halle

doi:10.1117/12.154926

15 September 1993 Influence of humidity profiles derived from GOES imagery in the Canadian forecast model

Louis Garand, Jacques Halle

Proceedings Volume 1934, Passive Infrared Remote Sensing of Clouds and the Atmosphere; (1993) https://doi.org/10.1117/12.154926
Event: Optical Engineering and Photonics in Aerospace Sensing, 1993, Orlando, FL, United States

Abstract

From a pattern recognition technique applied on GOES-7 full disks, humidity profiles defined at six standard levels (300 - 1000 mb) are retrieved on 1 degree(s) X 1 degree(s) areas in all weather/cloud conditions. Using one of two retrievals in each direction, about 3000 profiles are assimilated every six hours from 60 degree(s) N to 60 degree(s) S, 50 degree(s) E to 170 degree(s) W in the Canadian global forecast model. Slightly improved forecasts of geopotential are obtained over North America. Significant differences are noted locally in the forecast instantaneous and accumulated precipitation, especially in the tropics. Both analyses and forecasts of low level stratocumulus which are extensive west of continents are clearly improved. The system became operational in April 1993 and will soon be extended to Meteosat-3 now at 75 degree(s) W; the two geostationary satellites provide humidity profiles on 40% of the globe four times daily.

Citation Download Citation

Louis Garand and Jacques Halle "Influence of humidity profiles derived from GOES imagery in the Canadian forecast model", Proc. SPIE 1934, Passive Infrared Remote Sensing of Clouds and the Atmosphere, (15 September 1993); https://doi.org/10.1117/12.154926

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