Experiments in numerical objective frontal analysis
Abstract
A major area of weather analysis still requiring manual subjective determination is that of locating fronts. The
experiments reported on here concern an attempt to incorporate objective frontal analysis into the operational computer
routines of the U.S. Navy Fleet Numerical Weather Facility, Montercy, Calif.
The synoptically-important numerically-derived frontal zone is regarded as a hyperbaroclinic region whose
boundaries may be defined as quasi first-order thermal and moisture discontinuitizs; the boundaries are located
through use of suitably defined second derivatives of various potential temperature parameters. Application is
made to 850-mb. and surface (or 1000-mb.) frontal analyses on a hemispheric basis. The analyses for 0000 and 1200
GMT January 1, 1965 are selected to exemplify results of the most promising of the experiments.
Verification against hand-derived frontal analyses, difficulties with the existing scheme, and proposed modifications
to the continuing program are discussed.
Description
Monthly Weather Review, Vol. 93, No. 9, pp. 547-556, September 1965.
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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