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Air Weather Service aircraft airspeed analyst and/or Visibility applied climatology approximation assume attribute autocorrelation average ballistic wind Base binomial binomial distribution calculated ceiling and visibility ceiling/visibility circular normal distribution class frequencies climatological components computed cumulative defined determine Elliptical Normal equal Equation error of estimate evapotranspiration Example feet field capacity Figure frequencies of occurrence frequency distribution given grid point ground speed harmonic heat index inch independent knots levels linear mean and standard Mean Duration mean number mean resultant meteorological method miles minimum month monthly Nomogram number of days observations P(AB parameters percent percentage frequency plotted precipitation probability paper resultant wind return period sample soil moisture specified standard deviation standard error standard vector deviation stations statistical storm straight line surface synoptic Table techniques tractionability U.S. Weather Bureau USAF ETAC variable variance vector correlation coefficient wind distribution wind factor wind speed zero zonal and meridional