%0 Journal Article %T Observability of planetary waves and their predictability in the ECMWF H500 forecasts %A D. M. Sonechkin %J Advances in Science and Research (ASR) %D 2010 %I Copernicus Publications %R 10.5194/asr-4-5-2010 %X The problem of a hard contradiction between limited possibilities of meteorological observations and uncontrolled complication of the present-day weather forecasting models, and its consequences for the planetary wave predictability are considered with examples from the ECMWF short- and medium-range H500 forecasts for the Northern Hemisphere. A supposition is voiced that this problem adds difficulties to the weekly predictability limit overcoming. %U http://www.adv-sci-res.net/4/5/2010/asr-4-5-2010.html