An experiment in modifying objective 500-mb contour analyses using Tiros IX nephanalyses

Abstract

One of the numerical operational products of the United States Navy Fleet Numerical Weather Facility (FNWF) is the objective analysis of 500- mb contours on a hemispheric basis. Up to mid 1965, this analysis has been accomplished without use of weather-satellite observations. The period of 14 thru 20 February 1965 is selected as an experimental test period for the purpose of modifying the FNWF 500-mb analyses in the sparse-data region of the central North Pacific Ocean at 00Z. Synoptic scale phenomena depicted on Tiros IX nephanalyses are used as basis for the analysis modification. Modified 24- and 48-hour prognoses are made and verified. Results are interpreted in light of the experimental nature of the project, restricted time interval selected and experience level of the authors in the field of satellite meteorology.