scope:

Recommendation ITU-R P.837-4 contains maps of meteorological parameters that have been obtained using the European Centre for Medium-Range Weather Forecast (ECMWF) ERA-15 re-analysis database. New maps have been generated using the ECMWF ERA-40 re-analysis database, which is a new product generated by ECMWF using improved assimilation and forecast procedures and covering a longer time period with improved spatial resolution. In addition, the regression coefficients used in the prediction of rainfall rate have been optimized.

Rainfall rate statistics with a 1-min integration time are required for the prediction of rain attenuation in terrestrial and satellite links. Data of long-term measurements of rainfall rate may be available from local sources, but only with higher integration times. This Recommendation provides a method for the conversion of rainfall rate statistics with a higher integration time to rainfall rate statistics with a 1-min integration time.