637
NOUS41 KWBC 022005
PNSWSH
SERVICE CHANGE NOTICE 25-81
NATIONAL WEATHER SERVICE HEADQUARTERS SILVER SPRING MD
305 PM EST TUE DEC 2 2025
TO: SUBSCRIBERS:
-NOAA WEATHER WIRE SERVICE
-EMERGENCY MANAGERS WEATHER INFORMATION NETWORK
-NOAAPORT
OTHER NWS PARTNERS, USERS AND EMPLOYEES
FROM: DAVID MICHAUD, DIRECTOR
NCEP CENTRAL OPERATIONS
SUBJECT: CONSOLIDATION OF DATA SUBSETTING SERVICES VIA
TERMINATION OF OPENDAP FORMAT FILES ON NOMADS.NCEP.NOAA.GOV
EFFECTIVE: JANUARY 20, 2026
THE NATIONAL CENTERS FOR ENVIRONMENTAL PREDICTION (NCEP) WILL
TERMINATE THE OPENDAP FORMAT OF FILES ON NOMADS.NCEP.NOAA.GOV AS
PART OF THE NATIONAL WEATHER SERVICE’S (NWS) MODERNIZATION
EFFORTS. THIS ACTION WILL BE EFFECTIVE ON OR ABOUT 1200 UTC JAN
20, 2026. IN CASE OF A CRITICAL WEATHER DAY (CWD) OR ENHANCED
CAUTION EVENT (ECE) DECLARATION THIS ACTION WILL BE DELAYED
UNTIL THE NEXT BUSINESS DAY AFTER CWD OR ECE ENDS.
THE OPENDAP DATA ACCESS PROTOCOL WILL BE RETIRED FROM NOMADS AND
USERS ARE ENCOURAGED TO TRANSITION THEIR DATA PULLS TO EITHER
THE GRIB FILTER SERVICE OR TO HTTPS DOWNLOADS OF THE MODEL
OUTPUT FILES. ALL NCEP MODEL DATA WILL CONTINUE TO BE AVAILABLE
VIA OTHER SUPPORTED SUBSETTING AND TRANSFER PROTOCOLS.
THIS TERMINATION WILL IMPACT THE FOLLOWING NCEP MODELS CURRENTLY
AVAILABLE ON THE NOMADS WEBSITE, INCLUDING BUT NOT LIMITED TO:
* GLOBAL FORECAST SYSTEM (GFS)
* GLOBAL ENSEMBLE FORECAST SYSTEM (GEFS)
* GLOBAL DATA ASSIMILATION SYSTEM (GDAS)
* NORTH AMERICAN ENSEMBLE FORECAST SYSTEM (NAEFS)
* NORTH AMERICAN MESOSCALE MODEL (NAM)
* HI-RESOLUTION WINDOW (HRESW)
* HIGH-RESOLUTION RAPID REFRESH (HRRR)
* NATIONAL BLEND OF MODELS
* RAPID REFRESH (RAP)
* SHORT RANGE ENSEMBLE FORECAST SYSTEM (SREF)
* REAL TIME OCEAN FORECAST SYSTEM (RTOFS) GLOBAL
* SEA ICE ANALYSIS
* GREAT LAKES WAVE UNSTRUCTURED (GLWU)
* WAVE WATCH III (WW3)
* GLOBAL DATA ASSIMILATION SYSTEM (GDAS)
* CLIMATE FORECAST SYSTEM (CFS)GLOBAL FORECAST SYSTEM (GFS)
ALL DATA AVAILABLE VIA OPENDAP ON NOMADS.NCEP.NOAA.GOV IS
CURRENTLY AVAILABLE
AT THE FOLLOWING LOCATIONS:
HTTP: HTTPS://NOMADS.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/
USERS OF OPENDAP WHO WISH TO CONTINUE TO DOWNLOAD ONLY A SUBSET
OF THE FILES CAN DO SO VIA THE GRIB FILTER OR "FAST DOWNLOAD
METHOD".
FOR INFORMATION ON FILE SUBSETTING VIA GRIB FILTER PLEASE SEE
THE DOCUMENTATION HERE:
HTTPS://NOMADS.NCEP.NOAA.GOV/INFO.PHP?PAGE=GRIBFILTER
FOR INFORMATION ON THE "FAST DOWNLOAD METHOD" PLEASE SEE THE
DOCUMENTATION HERE:
HTTPS://NOMADS.NCEP.NOAA.GOV/INFO.PHP?PAGE=FASTDOWNLOAD
PLEASE SUBMIT COMMENTS, QUESTIONS, OR REQUESTS PERTAINING TO
THIS CHANGE TO:
NOMADS PRODUCT OWNER
ANNE MYCKOW
CHIEF, SOFTWARE DEVELOPMENT BRANCH, OFFICE OF DISSEMINATION
ANNE.MYCKOW@NOAA.GOV
FOR QUESTIONS ABOUT THE DATAFLOW ASPECTS, PLEASE CONTACT:
MARGARET CURTIS
NCEP CENTRAL OPERATIONS HPC DATAFLOW TEAM LEAD
NCEP.PMB.DATAFLOW@NOAA.GOV
NATIONAL PUBLIC INFORMATION STATEMENTS ARE ONLINE AT:
HTTPS://WWW.WEATHER.GOV/NOTIFICATION/
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