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NOUS41 KWBC 261545
PNSWSH
SERVICE CHANGE NOTICE 26-74
NATIONAL WEATHER SERVICE HEADQUARTERS SILVER SPRING MD
1145 AM EDT WED AUG 26 2026
TO: SUBSCRIBERS:
-NOAA WEATHER WIRE SERVICE
-EMERGENCY MANAGERS WEATHER INFORMATION NETWORK
-NOAAPORT
OTHER NWS PARTNERS, USERS AND EMPLOYEES
FROM: DAVID MICHAUD
DIRECTOR, NWS CENTRAL OPERATIONS
SUBJECT: UPGRADE OF THE NATIONAL BLEND OF MODELS (NBM) EFFECTIVE
IMMEDIATELY TO VERSION 5.0.15 TO ADDRESS NBM USAGE OF GRIDDED
TROPICAL CYCLONE FORECAST ADVISORY MESSAGE (GTCM) DATA IN THE
HAWAII DOMAIN.
EFFECTIVE ON FRIDAY, AUGUST 21, 2026, BEGINNING WITH THE 1900
COORDINATED UNIVERSAL TIME (UTC) RUN, THE NATIONAL WEATHER
SERVICE CENTRAL OPERATIONS IMPLEMENTED A SMALL UPGRADE PACKAGE
FOR THE NBM TO ADDRESS MISSING GTCM IN THE HAWAII DOMAIN. THE
NBM V5.0.15 UPDATE ALLOWS FOR CENTRAL PACIFIC TROPICAL CYCLONES,
ORIGINATING WEST OF 140 DEGREES WEST LONGITUDE, TO BE PROPERLY
INGESTED IN NBM PRODUCTS FOR THE HAWAII DOMAIN.
FULL DETAILS ON NBM V5.0 ARE AVAILABLE IN THE NOTICE AT:
HTTPS://WWW.WEATHER.GOV/MEDIA/NOTIFICATION/PDF_2026/SCN26-
24_UPDATED_NBM_V5.0_AAC.PDF
PLEASE SUBMIT COMMENTS, QUESTIONS, OR REQUESTS PERTAINING TO
THIS UPGRADE TO:
GEOFF MANIKIN
CHIEF, STATISTICAL MODELING DIVISION
MDL/SILVER SPRING, MARYLAND
GEOFFREY.MANIKIN@NOAA.GOV
OR
DAVID RUDACK
NBM TEAM LEAD
MDL/SILVER SPRING, MARYLAND
DAVID.RUDACK@NOAA.GOV
FOR QUESTIONS ABOUT THE DATAFLOW ASPECTS, PLEASE CONTACT:
MARGARET CURTIS
NWS CENTRAL OPERATIONS DATAFLOW TEAM LEAD
NCEP.PMB.DATAFLOW@NOAA.GOV
NATIONAL SERVICE CHANGE NOTICES ARE ONLINE AT:
HTTPS://WWW.WEATHER.GOV/NOTIFICATION/
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