Almost all partners work with data from ECMWF. A number of projects will also be conducting experiments with the ECMWF data assimilation system or rerunning ensemble forecasts. Also with respect to TIGGE, at the ECMWF are important contact persons.Thus the collaboration with ECMWF is very important for PANDOWAE. Specific collaborations have been agreed particularly with ECMWF data assimilation scientists. On the one hand, PANDOWAE-scientists will be travelling to the ECMWF to get there optimal support for their individual questions, on the other hand ECMWF scientists will be invted to participate in the PANDOWAE meetings.