Use of the MSG SEVIRI channels in a combined SSM/I, TRMM and geostationary IR method for rapid updates of rainfall

The METEOSAT Second Generation (MSG) Spinning Enhanced Visible and Infrared Imager (SEVIRI) twelve channels significantly amplify the capabilities of sensing cloud microstructure and precipitation forming processes from a geostationary platform. A potential exists for improved instantaneous rainfall measurements from space, especially when combined with passive microwave (MW) measurements (Levizzani et al., 1999). A near real-time adjustment of the thermal infrared (IR) co-localized with MW-based rainrates is operationally very promising. Numerical weather prediction (NWP) model data need to be incorporated within the rapid-update scheme in order to accommodate orographic precipitation, a common error source. Rainfall and humidity assimilation, and microphysical parameterizations for Local Area Models (LAM) are studied as well as verification of model output. Tests of the real time rainrates are planned in the operational environment, e.g. nowcasting and hydrogeological disaster management, and for the evaluation of the attenuation effects on K-band satellite telecommunication. Operational use over large areas is envisaged.

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