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Objective determination of the maximum wind speed and level using a cubic spline technique
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1984
[PDF-2.41 MB]
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Description:During the past several years, NMC, in response to interest expressed by the International Civil Aviation Organization (ICAO), developed two numerical methods for finding the maximum wind speed (MW) and the pressure level of the maximum wind (PMW). The first (old) method, which uses a quadratic polynomial technique, was developed in 1981 by Stackpole and described in NMC Office Note 229 (Ref. 1). Tests and evaluations in 1982 (Ref. 2) revealed that this method produces reasonable and reliable data. The second (new) method, which uses a cubic spline technique to calculate the maximum wind is the topic of this Office Note. The cubic spline method described here is patterned after the maximum wind finder used in the 15-level forecast model at the British Meteorological Office (Bracknell). The major difference between Bracknell's and NMC's method is that Bracknell uses data at sigma levels while NMC uses data at mandatory pressure levels. A description of Bracknell's method can be found in an article written by Watkins et al, June 1983 (Ref. 3). This paper presents a brief description of the method used at NMC, an example, and a statistical summary.
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Content Notes:Joseph Johnson.
"July 1984."
"This is an unreviewed manuscript, primarily intended for informal exchange of information among NMC staff members."
System requirements: Adobe Acrobat Reader.
Includes bibliographical references.
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Rights Information:Public Domain
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