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.
2.
A b-deck is a data file that contains the history of past storms'center locations, intensity, and other parameters at the six hourly synoptic times : 0000, 0600, 1200, and 1800 UTC . The files can contain information outside of synoptic hours, such as the time of landfall.
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