941
NOUS41 KWBC 221830
PNSWSH
SERVICE CHANGE NOTICE 25-66
NATIONAL WEATHER SERVICE HEADQUARTERS SILVER SPRING MD
230 PM EDT FRI AUG 22 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: PROBABILISTIC RIP RISK, WAVE RUNUP DATA, AND SPECTRAL
POINT OUTPUTS MOVING TO NOMADS EFFECTIVE SEP 22, 2025
EFFECTIVE MONDAY, SEPTEMBER 22, 2025, THE NATIONAL WEATHER
SERVICE (NWS) WILL IMPLEMENT AN UPGRADE TO THE NEARSHORE WAVE
PREDICTION SYSTEM (NWPS) TO VERSION 1.4.20. IN THE EVENT THAT
THE IMPLEMENTATION DATE IS DECLARED A CRITICAL WEATHER DAY
(CWD), AN ENHANCED CAUTION EVENT (ECE), OR OTHER SIGNIFICANT
WEATHER IS OCCURRING OR IS ANTICIPATED TO OCCUR, IMPLEMENTATION
OF THIS CHANGE WILL TAKE PLACE AT 1200 UTC ON THE NEXT WEEKDAY
NOT DECLARED A CWD AND WHEN NO SIGNIFICANT WEATHER IS OCCURRING.
THIS UPGRADE WILL INTRODUCE NEW FILES TO THE NCEP NOMADS AND
FTP. THESE FILES WERE PREVIOUSLY DISTRIBUTED VIA THE FOLLOWING
LOCATIONS/NAMES:
FTP://POLAR.NCEP.NOAA.GOV/NWPS/RR.20250529/WFO/CC/CG1/WFO_NWPS_5
M_CG1_RIPPROB.YYYYMMDD_HHMM
FTP://POLAR.NCEP.NOAA.GOV/NWPS/RR.20250529/WFO/CC/CG1/WFO_NWPS_2
0M_CG1_RUNUP.YYYYMMDD_HHMM
FTP://POLAR.NCEP.NOAA.GOV/NWPS/RR.20250529/WFO/CC/CGN/SPC2D.*.CG
N.YY25.MO05.DD29.HH00
DISTRIBUTION TO POLAR.NCEP.NOAA.GOV WILL END ON SEPT 22.
THESE FILES, WHICH PROVIDE PROBABILISTIC GUIDANCE FOR RIP
CURRENTS, COASTAL WAVE RUNUP, AND SPECTRAL POINT OUTPUTS, WILL
BE RENAMED AND MADE AVAILABLE AT THE FOLLOWING LOCATIONS/NAMES:
NOMADS:
HTTPS://NOMADS.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/NWPS/PROD/RR.2025
0529/WFO/CC/CG1/NWPS.TCCZ.5M_CG1_RIPPROB.WFO.TXT
HTTPS://NOMADS.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/NWPS/PROD/RR.2025
0529/WFO/CC/CG1/NWPS.TCCZ.20M_CG1_RUNUP.WFO.TXT
HTTPS://NOMADS.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/NWPS/PROD/RR.2025
0529/WFO/CC/CGN/NWPS.TCCZ.SPC2D_*_CGN.WFO.TXT
FTP:
FTP.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/NWPS/V1.4/RR.20250529/WFO/CC
/CG1/NWPS.TCCZ.5M_CG1_RIPPROB.WFO.TXT
FTP.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/NWPS/V1.4/RR.20250529/WFO/CC
/CG1/NWPS.TCCZ.20M_CG1_RUNUP.WFO.TXT
FTP.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/NWPS/V1.4/RR.20250529/WFO/CC
/CGN/NWPS.TCCZ.SPC2D_*_CGN.WFO.TXT
FOR USERS WHO PREVIOUSLY ACCESSED THIS DATA FROM THE NON-
OPERATIONAL POLAR SERVER, YOU MUST TRANSITION TO THE OPERATIONAL
NOMADS AND FTP DISTRIBUTION MECHANISMS OUTLINED ABOVE.
NCEP ENCOURAGES USERS TO ENSURE THEIR DECODERS ARE FLEXIBLE AND
ARE ABLE TO ADEQUATELY HANDLE CHANGES IN CONTENT ORDER, CHANGES
IN THE SCALING FACTOR COMPONENT WITHIN THE PRODUCT DEFINITION
SECTION (PDS) OF THE GRIDDED BINARY (GRIB) FILES, AND ANY VOLUME
CHANGES WHICH MAY BE FORTHCOMING. THESE ELEMENTS MAY CHANGE WITH
FUTURE NCEP MODEL IMPLEMENTATIONS. NCEP WILL MAKE EVERY ATTEMPT
TO ALERT USERS TO THESE CHANGES PRIOR TO ANY IMPLEMENTATIONS.
PLEASE SUBMIT COMMENTS, QUESTIONS, OR REQUESTS PERTAINING TO
THIS UPGRADE TO:
ALI SALIMI-TARAZOUJ
ENVIRONMENTAL MODELING CENTER
ALI.SALIMI@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 SERVICE CHANGE NOTICES ARE ONLINE AT:
HTTPS://WWW.WEATHER.GOV/NOTIFICATION/
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