The National Blend of Models (NBM)

The National Blend of Models (NBM) is a nationally consistent and skillful suite of calibrated forecast guidance based on a blend of both NWS and non-NWS numerical weather prediction model data and post-processed model guidance. The goal of the NBM is to create a highly accurate, skillful and consistent starting point for the gridded forecast. This new way to produce NDFD grids will be helpful providing forecasters with a suite of information to use for their forecasts. The NBM is considered an important part of the efforts to evolve NWS capabilities to achieve a Weather-Ready Nation.

NBM Product Pages

NBM Image Viewer* (login required)image from nbm viewer
NBM Text Bulletins
  image of nbm text bulletin

NBM Data Download

Operational Products

NBM Grib2 Files (v3.0)

The master files contain all available elements in Grib2 format (specifications can be found on the NBM v3.0 Grib Specifications Page). Files are in directories blend.YYYYMMDD/CC/grib2/ where YYYYMMDD is the run datestamp, and CC is the cycle. File names are as follows: blend.tCCz.master.fXXX.RR.grib2, where CC is the cycle, XXX is the forecast hour, and RR is the region. These files are available for 1-2 days.

Data Product Region Format URL
Grib2 NBM master files CONUS (co), Alaska (ak), Hawaii(hi), Puerto Rico(pr) Grib2 ftp://ftp.ncep.noaa.gov/pub/data/nccf/com/blend/prod/blend.YYYYMMDD/CC/grib2/

Experimental Products

If you desire access to NBM products prior to operational implementation, please contact MDL