GribStream - A fast, efficient and easy weather forecast history API
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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.
At UTC hours 1, 7, 13 and 19 it forecasts all 264 hours ahead (horizons). At all other hours it forecasts all hours up to hour ahead 36, then every third hour up to 192 hours ahead and then every sixth hour up to 264 hours ahead. Sometimes the NBM archive will skip a forecast or it may be corrupted.
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