The Evolution of Objective Analysis Methodology at the National Meteorological Center

Abstract

The objective analysis of meteorological variables has been routinely performed at the National Meteorological Center (NMC) since October 1955. In the first few years, much attention was devoted to incorporating three principles of subjective meteorological analysis into the automated procedures: spatial coherence, temporal continuity, and adherence to dynamic constraints. Consideration of these principles has continued in subsequent years as objective analysis methodology has evolved. That evolution has been driven by three interrelated developments: advances in observing technology, progress in prediction modeling, and a marked increase in computer capability. In light of these factors, this paper surveys the evolution of analysis methodology at NMC from 1955 to the end of 1988.