Latest NWS Notifications

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Public Information Statements

PNS23-45: Soliciting Comments on an Upgrade of the National Blend of Models through August 31, 2023

PNS20-71 Updated: Known bugs introduced into National Blend of Models (NBM) v4.0 - implementation November 3, 2020

PNS19-18: Soliciting comments on the upgrade of experimental National Blend of Models guidance through August 31, 2019

PNS18-02: Soliciting Comments on the Upgrade of Experimental National Blend of Models Guidance through June 27, 2018

Service Change Notices

SCN23-52: Correcting National Blend of Models (NBM) Low-Level Wind Shear (LLWS) Height Calculation, and Other Minor Fixes to NBM v4.1: Effective on or about April 25, 2023

SCN22-131: Upgrade of National Blend of Models Guidance: Effective January 17, 2023

SCN22-47: Mitigating the Low Bias of NBM Deterministic 6-hour Quantitative Precipitation Forecasts (QPF06) for the CONUS Domain: Effective July 19, 2022

SCN22-33: Removing NAVGEM Input from Some NBM Probabilistic Temperature Quantile Mapping Forecasts for the CONUS Domain: Effective April 12, 2022

SCN21-73: Update to the National Blend of Models (NBM) Quantile Mapping and Dressing (QMD) to Fix an Issue with Probability of Precipitation Values in the Alaska Domain: Effective on or about August 17, 2021

SCN21-73A: Update to the National Blend of Model’s (NBM) Quantile Mapping and Dressing (QMD) to Fix an Issue with Unrealistically High Probability of Precipitation values over Northwest Mexico

SCN21-24A Updated: Modifying the NBM's Quantile Mapping and Dressing (QMD) Grand Ensemble Mean (GEM) Deterministic QPF for the CONUS, Alaska, and Puerto Rico Domains; and Minor Corrections Made to the NBM QMD QPF, Present Weather, AK Fire Weather, and Text Message Products: Effective March 29, 2021

SCN20-91 Updated: NOAAPort / Satellite Broadcast Network (SBN) National Blend of Models (NBM) Dissemination Test on October 27, 2020

SCN20-07: Correct Issue with NBM v3.1 GFS QPF Input on January 21, 2020

SCN19-92 Updated: Correction to Properly Pack Low Level Wind Shear Data for Downstream NBM Processing. Implementation Date has been Delayed to Tuesday, February 18, 2020

SCN19-92: Upgrade of the National Blend of Models guidance from an experimental service to initial operating capability effective December 17, 2019

SCN19-07: Temporary change of SBN/NOAAPORT transmission of National Blend of Models (NBM) Guidance Effective March 11-13, 2019

SCN18-78 Updated: Correction of the GRIB2 encoding of the Probability of Thunder in the experimental National Blend of Models guidance (NBM) effective December 05, 2018, and the request for comments

SCN18-78 Updated: Upgrade of experimental National Blend of Models guidance effective October 3, 2018, and request for comments

SCN18-78 Updated: Upgrade of experimental National Blend of Models guidance effective September 19, 2018, and request for comments

SCN18-78: Upgrade of experimental National Blend of Models guidance effective September 19, 2018, and request for comments

SCN17-59 Updated: Slight adjustments to SBN and NOMADS transmission of National Blend of Models (NBM) guidance and bug fix effective on October 10, 2017

SCN17-59: Updated: Slight adjustments to SBN and NOMADS transmission of National Blend of Models (NBM) guidance and bug fix effective on October 10, 2017

SCN17-59: Updated: Upgrade of experimental National Blend of Models guidance effective July 27, 2017, and request for comments

SCN 17-59: Updated upgrade of experimental National Blend of Model guidance effective July 11, 2017, and request for comments

Technical Implementation Notices

TIN 16-33: Amended Implementation of experimental National Blend of Models guidance effective November 3, 2016, and request for comments

TIN 16-33:Implementation of experimental National Blend of Models guidance effective September 21, 2016, and request for comments

Amended TIN 15-50: Implementation of experimental National Blend of Models guidance for the CONUS effective January 6, 2016

TIN 15-50: Implementation of experimental National Blend of Models guidance for the CONUS effective December 15, 2015

 

Additional Notices

SCN, TIN, PNS, etc. can be found (along with those of other NWS products and services) at: https://www.weather.gov/notification/
(For older notifications, please see: https://www.weather.gov/notification/archive)

NBM