Introduction

The National Weather Service (NWS) National Blend of global Models (NBM) is designed to serve as a starting point for creating U.S. national weather forecasts, based on the best possible science. For an overview of the NBM, see the lesson Introduction to the NWS National Blend of Global Models.

The NBM (or the Blend) is based on output from global models/ensembles, and statistically post-processed guidance. Below is a schematic of how the NBM temperature-based elements are derived. Details on the blending methodologies for various weather elements will be provided in a future lesson. In this lesson, we discuss the two main sources of information integrated into the Blend: Direct Model Output (DMO) and gridded Model Output Statistics (MOS).