surface observation उदाहरण वाक्य

During 1936 and 1937, the pilot balloons to measure the winds aloft at the synoptic hours of 0000, 0600, 1200, and 1800 UTC . In 1938 and 1939, France established a merchant ship as the first stationary weather ship, which took surface observations and launched radiosondes to measure weather conditions aloft.