WMO Technical Conference on Meteorological and Environmental Instruments and Methods of Observation (TECO-2006) Geneva, Switzerland - 6 December 2006 Experience of Upgrading Radiosonde Stations in Africa P. Charpentier, G. Ricaud, R. Pépin (France) MODEM Z.A. de l’Orme à bonnet 91750 Chevannes, France tel.: +(33 1) 64 99 77 52 – fax: +(33 1) 64 99 77 53) [email protected] INNOVATIONS IN OBSERVING SYSTEMS AND PRACTICES TO MEET THE EVOLVING NEEDS OF MEMBERS