Description of the upgrade

Analysis modified. The u and v departures are checked together. The persistence error calculation and the indication of inner data in upper slab were corrected. Serious data problems with satellite soundings (SATEMs and TOVS) at the beginning of November. The performance of the ECMWF analysis and forecast especially over the Southern Hemisphere was adversely affected by these data deficiencies.

Implemented: 11 November 1986