TY - RPRT AU - M. Jarraud AU - Adrian Simmons AU - M. Kanamitsu CY - Shinfield Park, Reading DA - 09/1986 LA - eng M1 - 56 M3 - Technical Report PB - ECMWF PP - Shinfield Park, Reading PY - 1986 EP - 83 TI - Sensitivity of medium-range weather forecasts to the use of an envelope orography. ER -