'Pampa' was the Allied programme of meteorological flights over Germany and eastern Europe (7 November 1941/May 1945).
The first such undertaking was flown on 7 November 1941 by a single-engined Supermarine Spitfire, but the task was soon assumed by the twin-engined de Havilland Mosquito, which had the advantage of greater range, payload and a navigator to supplement the pilot.