The Use of Satellite Observed Cloud Patterns in Northern Hemisphere 300 mb and 1000/300 mb Numerical Analysis.
NAVAL ENVIRONMENTAL PREDICTION RESEARCH FACILITY MONTEREY CA
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A quasi-objective statistical method for deriving 300 mb gepotential heights and 1000300 mb thickness in the vicinity of extra tropical cyclones with the aid of satellite imagery is presented. The technique utilizes satellite observed extratropical spiral cloud pattern parameters in conjunction with parameters derived from the ogiginal height or thickness field which has been scale separated into additive long and short wavelength component fields. Empirical relationships between extratropical spiral cloud patterns associated with negative extrema positive vorticity maxima in the short wavelength component field are exploited in modifying the pattern of the latter. Regression equations are used to specify the magnitude of the negative extrema. The 300 mb heights and 1000300 mb thicknesses are then retrieved by direct addition of the modified short wavelength component field to the long wavelength component field. Procedures for applying this technique in an operational format designed to utilize the U.S. Navys SPADS Satellite Data Processing and Display System are described. It is concluded that the resulting modifications can contribute to significant improvements in the 300 mb geopotential height and the 1000300 mb thickness analysis in data sparse areas.