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Table 2. U.S. Weather Bureau Instructions to Marine Meteorological Observers. ------------------------------------------------------------------------------- EXAMPLES OF CHANGES IN CODES AND OBSERVING PRACTICES Wind Wind Sea Mercury EDITION YEAR Clouds Direction Speed Weather Temp. Barometer =============================================================================== Instructions Late Proportion Mean Beaufort Beaufort Bucket No correct- attached to 1800s of clear magnetic force weather temp. ions as forms sky 10ths direction code read* First 1906 Amount of True wind " " " " clouds in direction 10ths 32-point Second 1908 " " " " " " Third 1910 " " " " " " Fourth 1925 " " " " " No correct- ions as read** Fifth 1929 " " " " " " Sixth 1938 " " " 00-99 pres. Bucket/ " weather code injection Seventh 1941 " " " " " " Provisional 1949 Eighths 36-point Knots " " Corrected to sea level ------------------------------------------------------------------------------ * Indications are that this was probably the practice, however, it is not clearly evident from reading the instructions. ** Corrections to be added for radio transmissions. NOTE: Updates after 1941 include Circular M (editions 8-12) in 1950, 1954, 1959, 1963, 1964, and NWSOH No. 1 editions in 1971, 1982, and 1992. A new update will be required for the November 2, 1994 approved WMO code changes. ----------
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