047
NOUS41 KWBC 211515 AAB
PNSWSH
SERVICE CHANGE NOTICE 26-24 UPDATED
NATIONAL WEATHER SERVICE HEADQUARTERS SILVER SPRING MD
1115 AM EDT TUE APR 21, 2026
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
NATIONAL CENTERS FOR ENVIRONMENTAL PREDICTION
SUBJECT: UPDATED: UPGRADE OF NATIONAL BLEND OF MODELS GUIDANCE
EFFECTIVE APRIL 23, 2026
UPDATED TO REFLECT THE NEW IMPLEMENTATION DATE OF APRIL 23,
2026.
ON OR ABOUT THURSDAY, APRIL 23, 2026, BEGINNING WITH THE 1300
UNIVERSAL TIME COORDINATED (UTC) MODEL RUN, THE NWS
METEOROLOGICAL DEVELOPMENT LABORATORY (MDL) WILL IMPLEMENT AN
UPDATE TO THE NATIONAL BLEND OF MODELS (NBM) GUIDANCE OVER THE
CONTIGUOUS UNITED STATES (CO), ALASKA (AK), HAWAII (HI), PUERTO
RICO (PR), GUAM (GU), AND OCEANIC (OC) NATIONAL DIGITAL FORECAST
DATABASE (NDFD) DOMAINS.
IN THE EVENT THAT THE IMPLEMENTATION DATE IS DECLARED A CRITICAL
WEATHER DAY (CWD), AN ENHANCED CAUTION EVENT, OR OTHER
SIGNIFICANT WEATHER IS OCCURRING OR IS ANTICIPATED TO OCCUR,
IMPLEMENTATION OF THIS CHANGE WILL TAKE PLACE AT 1300 UTC ON THE
NEXT WEEKDAY NOT DECLARED A CWD AND WHEN NO SIGNIFICANT WEATHER
IS OCCURRING.
1. PRODUCT ADDITIONS/REMOVALS
A. ADDITIONS
NBM VERSION 5.0 WILL CONTINUE TO FILL EXISTING PRODUCT GAPS
REQUESTED BY THE AVIATION, WATER RESOURCES, MARINE, WINTER, AND
TROPICAL NWS SERVICE PROGRAMS. ANYTHING LISTED AS "NEW"
INDICATES A BRAND-NEW PARAMETER IN THE NBM.
(1) A NEW 24H PROBABILITY MATCHED MEAN (PMM) QUANTITATIVE
PRECIPITATION PRODUCT (CONSISTING OF HIGH-RESOLUTION MODELS
ONLY) FOR THE CO AND AK DOMAINS.
(2) A NEW 24H PROBABILITY MATCHED MEAN DETERMINISTIC SNOW AND
ICE PRODUCT (CONSISTING OF HIGH-RESOLUTION MODELS ONLY) FOR THE
CO AND AK DOMAINS).
(3) NEW JOINT FIRE WEATHER PROBABILITIES FOR THE OCCURRENCE OF
VARIOUS COMBINATIONS OF WIND SPEEDS AND RH THRESHOLDS (CO, AK,
HI, PR, GU DOMAINS).
(4) QUANTILE-MAPPED (QM, REFERRED TO IN PRODUCTS AS "QMD") 10-
METER WIND SPEED AND WIND GUST GUIDANCE FOR THE AK, HI, PR, GU,
AND OC DOMAINS.
(5) DECAYING AVERAGE BIAS CORRECTED PROBABILISTIC DEW POINT
TEMPERATURE, 6-HOUR MAXIMUM AND MINIMUM 2-METER TEMPERATURE, AND
SKY COVER FOR THE OC DOMAIN.
(6) A NEW DETERMINISTIC AND PROBABILISTIC DECAYING AVERAGE BIAS-
CORRECTED PRECIPITABLE WATER GUIDANCE FOR THE CO, AK, HI, PR,
GU, AND OC DOMAINS.
(7) A NEW 24H, 48H, AND 72H CALIBRATED SNOW EXCEEDANCE PRODUCT
(CO).
(8) A NEW DETERMINISTIC SNOW DEPTH PRODUCT AND CORRESPONDING
EXCEEDANCE PROBABILITIES TO ASSIST FIRE WEATHER FORECASTING
EFFORTS OVER THE CO AND AK DOMAINS.
(9) PROBABILISTIC APPARENT TEMPERATURE FOR THE CO, AK, HI, PR,
AND GU DOMAINS AND DETERMINISTIC APPARENT TEMPERATURE FOR THE OC
DOMAIN.
(10) PROBABILISTIC SURFACE-BASED CONVECTIVE AVAILABLE POTENTIAL
ENERGY (CAPE: 10TH, 50TH, AND 90TH WEIGHTED PERCENTILES (CO).
THESE ADDITIONS WILL BENEFIT THE NWS IN ITS GOAL TOWARD
PROVIDING BETTER IMPACT-BASED DECISION SUPPORT SERVICES (IDSS).
AN EXHAUSTIVE LIST OF PROBABILISTIC ENHANCEMENTS IN NBMV5.0 CAN
BE VIEWED HERE: NBMV5.0 PERCENTILES AND EXCEEDANCES
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238069/NBM_V5.0_PERCEN
TILES_AND_EXCEEDANCES.PDF
B. REMOVALS
(1) PER THE REQUEST OF THE NWS'S FIRE WEATHER PROGRAM, NBMV5.0
WILL NO LONGER GENERATE THE HAINES INDEX PRODUCT (CO, AK, HI,
AND PR DOMAINS).
2. PRODUCT ENHANCEMENTS
SEVERAL HIGHLIGHTS ASSOCIATED WITH THIS UPCOMING RELEASE INCLUDE
THE FOLLOWING:
- ACHIEVEMENT OF GREATER CONSISTENCY BETWEEN MOST DETERMINISTIC
AND PROBABILISTIC OUTPUTS. FOR QPF AND WINTER FIELDS, THIS IS
ACHIEVED IN NBMV5.0 BY APPLYING THE SAME WEIGHTING OF INPUTS TO
THE GENERATION OF DETERMINISTIC AND PROBABILISTIC COMPUTATIONS.
FOR FIELDS LIKE TEMPERATURES, THE DETERMINISTIC VALUES IN THIS
PACKAGE ARE NO LONGER COMPUTED INDEPENDENTLY FROM THE
PROBABILISTIC VALUES.
- THE GENERATION OF QUANTILE-MAPPED (QM) QUANTITATIVE
PRECIPITATION FORECASTS (QPF) AND PROBABILITY OF PRECIPITATION
GUIDANCE (POP) REPLACES THE CURRENT EQUAL WEIGHTING OF ALL
INPUTS WITH AN APPROACH THAT GIVES MORE (PRE-DEFINED) WEIGHT TO
HIGHER-RESOLUTION INPUTS (CO, AK, HI, PR, AND OC DOMAINS). THE
MULTI-MODEL ENSEMBLE BIAS CORRECTION (MMEBC) QPF PRODUCT FROM
THE WEATHER PREDICTION CENTER (WPC) IS ADDED AS AN INPUT (CO).
PLEASE SEE THE QPF QM PRODUCT DESCRIPTION DOCUMENT AT
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238069/BLEND_PRECIP_QM
D_V5.0_CONFIGURATION_AND_TECHNICAL_DETAILS.PDFFOR A COMPLETE
DISCUSSION OF THE CHANGES TO THE PRECIPITATION PRODUCTS.
- SIGNIFICANT CHANGES TO THE WINTER SUITE INCLUDE UNEQUAL
WEIGHTING OF MODELS USED IN DERIVING PROBABILISTIC SNOW/ICE
OUTPUTS, USAGE OF INFORMATION FROM INPUTS THAT DO NOT COVER AN
ENTIRE ACCUMULATION PERIOD, REFINEMENTS TO DOWNSCALED
TEMPERATURE COMPUTATION FOR HANDLING INVERSIONS, CHANGES TO
INPUTS, AND REVISED CRITERIA FOR CONVERTING SNOW AND ICE TO RAIN
IN THE DOWNSCALING CODE. FOR SPECIFIC DETAILS CONCERNING ALL THE
MODIFICATIONS MADE TO THE NBMV5.0 SNOW AND ICE PRODUCTS, PLEASE
REFER TO THE SNOW/ICE PRODUCT DESCRIPTION DOCUMENT AT:
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238069/BLEND_WINTER_V5
.0_CONFIGURATION_AND_TECHNICAL_DETAILS.PDF (CO AND AK DOMAINS).
- REPLACEMENT OF DECAYING AVERAGE COMPUTATIONS OF INSTANTANEOUS
TEMPERATURE, DEW POINT TEMPERATURE, APPARENT TEMPERATURE,
RELATIVE HUMIDITY, AND 12-HOUR MAXIMUM AND MINIMUM RELATIVE
HUMIDITY (RH) WITH QM. THIS ALLOWS FOR THE COMPUTATION OF
ASSOCIATED PERCENTILE AND EXCEEDANCE VALUES (CO, AK, HI, PR, AND
GU DOMAINS).
- INTRODUCTION OF A NEW "PERCENTILE PICKING" APPROACH TO
GENERATE INSTANTANEOUS DETERMINISTIC WIND SPEED AND WIND GUST
FORECASTS RATHER THAN USING THE MEAN QM VALUE.THIS METHODOLOGY
MODULATES THE QM DETERMINISTIC 10-METER WIND SPEED AND WIND GUST
FORECASTS AWAY FROM THE MEAN VALUE AS A FUNCTION OF WHERE THE
MEAN FORECAST LIES RELATIVE TO THE MODEL DISTRIBUTION AND PAST
CLIMATOLOGY (CO, AK, HI, PR, GU, AND OC DOMAINS).
- AN UPDATE TO THE APPROACH USED TO BIAS CORRECT SIGNIFICANT
WAVE HEIGHTS (SWH) BY LEVERAGING QM TO REPLACE THE OPERATIONAL
DECAYING AVERAGE ALGORITHM. THE NUMBER OF MODEL INPUTS FOR SWH
IS INCREASED FROM 13 TO APPROXIMATELY 120, INVOKING THE
INDIVIDUAL MEMBERS FROM THE RELEVANT ENSEMBLE SYSTEMS, INSTEAD
OF JUST THE ENSEMBLE MEAN (CO, AK, HI, PR, GU, AND OC DOMAINS).
- REPLACEMENT OF THE DETERMINISTIC CEILING HEIGHT AND VISIBILITY
(C&V) GUIDANCE FOR THE HAWAIIAN DOMAIN WITH A NEW C&V PRODUCT
THAT MIRRORS THE GRIDDED "MELD" LOCALIZED AVIATION MOS PROGRAM
(LAMP) APPROACH USED OVER CO AND AK. THE NEW C&V GUIDANCE FOR HI
INCORPORATES A GRIDDED OBSERVATIONAL ANALYSIS, RAPID REFRESH
(RAP), GLOBAL FORECAST SYSTEM (GFS), AND EUROPEAN CENTRE FOR
MEDIUM-RAGE WEATHER FORECASTS (ECMWF) MODELS AS INPUTS. THE
PRODUCT LEVERAGES A RANDOM FOREST TECHNIQUE TO DERIVE "PSEUDO"
OBSERVATIONS OVER THE HAWAIIAN ISLANDS TO HELP INFORM THE
GRIDDED OBSERVATIONAL ANALYSIS (AN IMPORTANT COMPONENT IN THE
FIRST SIX HOURS).
- EXTENSION OF HOURLY GUIDANCE FROM 36 HOURS TO 48 HOURS
(EXCLUDING CEILING, VISIBILITY, CLOUD BASE, CLOUD LAYERS, LOW-
LEVEL WIND SHEAR, TURBULENCE, ELLROD INDEX, SOLAR RADIATION,
THUNDERSTORM COVERAGE, THUNDERSTORM PROBABILITY, AND CRAVEN-
WIEDENFELD AGGREGATE SEVERE PARAMETER).
- EXTENSION OF USAGE OF GRIDDED LOCALIZED AVIATION MOS PROGRAM
(GLMP) VISIBILITY AT WATER POINTS FROM 24 HOURS TO 36.
VISIBILITY FROM THE RAP WILL BE USED AT WATER POINTS BEYOND 36
HOURS (CURRENTLY 24 HOURS IN OPERATIONS).
3. CHANGES TO INPUTS
- REPLACEMENT OF THE LOW-RESOLUTION DETERMINISTIC ECMWF (0.25
DEGREE) AND ECMWF ENSEMBLE GUIDANCE (0.50 DEGREE) WITH 0.10
DEGREE AND 0.20 DEGREE DATA, RESPECTIVELY.
- REPLACEMENT OF THE LOWER RESOLUTION GDPS (25KM) AND REPS
(15KM) CANADIAN MODEL DATA WITH HIGHER HORIZONTAL RESOLUTION
DATA OF 15KM AND 10KM, RESPECTIVELY.
- ELIMINATION OF USAGE OF THE SHORT-RANGE ENSEMBLE FORECAST
SYSTEM.
- USAGE OF THE EUROPEAN CENTRE FOR MEDIUM-RANGE WEATHER
FORECASTS ARTIFICIAL INTELLIGENCE/INTEGRATED FORECASTING SYSTEM
(ECAIFS) AND THE ARTIFICIAL INTELLIGENCE GLOBAL FORECAST SYSTEM
(AIGFS) AT A 0.25 DEGREE SPATIAL RESOLUTION AS NBM INPUTS FOR
TEMPERATURE, WIND SPEED, AND QPF PRODUCTS (ALL DOMAINS, EXCEPT
NO QPF OVER GU).
- USAGE OF HIGHER-RESOLUTION DATA FROM THE GLOBAL ENSEMBLE
FORECAST SYSTEM (GEFS) FOR SURFACE PARAMETERS.
- THERE ARE CHANGES TO THE INPUTS USED FOR THE WINTER AND QPF
PRODUCTS. THOSE ARE DETAILED IN THE WINTER AND QPF DOCUMENTS
LINKED AT THE BEGINNING OF SECTION 2.
4. NBM TEXT PRODUCT CHANGES
A COMPREHENSIVE LIST OF STATIONS FOR WHICH DETERMINISTIC-BASED
HOURLY (NBH), SHORT-TERM (NBS), EXTENDED (NBE), SUPER EXTENDED
(NBX), AND PROBABILISTIC EXTENDED (NBP) STATION TEXT BULLETIN
GUIDANCE CAN BE FOUND AT: HTTPS://VLAB.NOAA.GOV/WEB/MDL/NBM-
STATIONS-V5.0
A DESCRIPTION OF ALL NBM TEXT FILE PRODUCTS CAN BE FOUND HERE:
HTTPS://VLAB.NOAA.GOV/WEB/MDL/NBM-TEXTCARD-V5.0
PLEASE NOTE THAT IN NBMV5.0, THE DAILY MAXIMUM AND MINIMUM
TEMPERATURE VALUES, DEWPOINT TEMPERATURE VALUES, AND SIGNIFICANT
WAVE HEIGHT FORECASTS NOW REPRESENT THE MEAN OF THE QM
DISTRIBUTION. THE INSTANTANEOUS WIND SPEED AND GUST ARE DERIVED
USING THE PERCENTILE-PICKED VALUES DISCUSSED IN SECTION 2. THE
ASSOCIATED STANDARD DEVIATION VALUES ARE ALSO DERIVED FROM THE
QM SOLUTION SPACE.
FOR ADDITIONS AND REMOVALS TO TEXT PRODUCTS, THE WET BULB GLOBE
TEMPERATURE (IDENTIFIED IN THE PRODUCTS AS WBG) IS ADDED TO THE
NBH, NBS, NBE, AND NBX TEXT PRODUCTS FOR ALL APPLICABLE
STATIONS. SIGNIFICANT WAVE HEIGHT (SWH) IS NOW AVAILABLE FOR ALL
CYCLES IN THE NBX TEXT PRODUCTS. SWH IS CURRENTLY AVAILABLE ONLY
FOR THE 00, 01, 02, 06, 07, 08, 12, 13, 14, 18, 19, AND 20 UTC
CYCLES IN THE OPERATIONAL NBX PRODUCTS. FINALLY, SINCE THE NBM
IS NO LONGER GENERATING A HAINES INDEX, THAT PARAMETER (HID) NO
LONGER EXISTS IN ANY NBM TEXT PRODUCTS.
AS A REMINDER, THE FILE NAMES OF THE FIVE TYPES OF NBM TEXT
MESSAGES ARE:
A. BLEND_NBHTX.T[HH]Z [WHERE HH=00,01,02,...,23]
B. BLEND_NBSTX.T[HH]Z [WHERE HH=00,01,02,...,23]
C. BLEND_NBETX.T[HH]Z [WHERE HH=00,01,02,...,23]
D. BLEND_NBXTX.T[HH]Z [WHERE HH=00,01,02,...,23]
E. BLEND_NBPTX.T[HH]Z [WHERE HH=00,01,07,12,13,19]
FOR A COMPREHENSIVE DOCUMENT FULLY DESCRIBING CHANGES TO THE
TEXT PRODUCTS, PLEASE REFER TO SECTION 7 - "NCEP WEB SERVICES
NOMADS DISSEMINATION".
5. NBM RUNTIME CHANGES
WITH THE IMPLEMENTATION OF NBMV5.0, DISSEMINATION DELAYS CAN BE
EXPECTED FOR SOME OF THE NBM QUANTILE MAPPED AND CORE PRODUCTS.
IN SOME INSTANCES, HOWEVER, USERS CAN EXPECT EARLIER ARRIVAL
TIMES OF THE DATA. SPECIFIC TIMING DIFFERENCES CAN BE VIEWED
HERE: NBMV5.0 TIMING DIFFERENCES
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238069/NBM_V5.0_TIMING
_DIFFERENCES.PDF
6. CHANGES TO SBN/NOAAPORT DISSEMINATION
WHILE THE NBM RUNS HOURLY AND PRODUCES OUTPUT TO 264 HOURS FOR
EACH CYCLE, AS WITH NBMV4.3, ONLY A SUBSET WILL BE DISSEMINATED
ACROSS THE SATELLITE BROADCAST NETWORK (SBN) AND NOAAPORT DUE TO
BANDWIDTH LIMITATIONS. NBMV5.0 DATA WILL BE DISSEMINATED IN
GRIB2 FORMAT AND WILL CONTAIN GROUPED WMO HEADERS, AS IS DONE IN
NBMV4.3.
CHANGES TO SBN DATA AS REQUESTED BY VARIOUS REGIONS:
-REMOVED THE BINARY SCALING FACTOR FOR THE FOLLOWING
ELEMENTS: AIR TEMPERATURE, APPARENT TEMPERATURE, DEW POINT
TEMPERATURE, TRANSPORT WIND SPEED, TROPICAL WIND SPEED, WIND
SPEED, AND WIND GUST.
-ADDED DIFFERENT CYCLES AND PROJECTIONS OF PRE-EXISTING
VARIOUS WEATHER ELEMENTS.
-ADDED NEW ELEMENTS BASED ON REQUESTS AND PRIORITY DUE TO
BANDWIDTH CONSTRAINTS.
-REMOVED THE DISSEMINATION OF THE NBM GLOBAL PRODUCT.
-A DETAILED LISTING OF DISSEMINATION CHANGES TO NBMV5.0
WEATHER ELEMENTS ON THE SBN/NOAAPORT AS A FUNCTION OF CYCLE TIME
AND DOMAINS CAN BE FOUND IN SUBSECTIONS A AND B BELOW.
UNIQUE ORIGINATING CENTER IDS HAVE BEEN ASSIGNED TO EACH
GEOGRAPHIC REGION.
LIST OF ORIGINATING CENTER IDS (CCCC) FOR NBM PRODUCTS:
GEOGRAPHIC REGION ORIGINATING CENTER (CCCC)
----------------- ------------------------
CO AND OC KWEA, KWEB, KWEI, KWEO
AK KWEC, KWED, KWEJ, KWEP
HI KWEE, KWEF, KWEK
PR KWEG, KWEH, KWEL
GU KWEM, KWEN, KWEQ
GLOBAL KWER
THE NBM TEXT BULLETIN WMO HEADER INFORMATION FOR EACH OF THE
FIVE BULLETINS TO BE DISSEMINATED EVERY HOUR ON THE SBN IS
LISTED BELOW.
WMO HEADER INFORMATION FOR NBM TEXT PRODUCTS:
WMO HEADER NBM TEXT BULLETIN DESCRIPTION
---------- -----------------------------
FOUS15 KWNO HOURLY BULLETIN (1-24 HOURS)
FOUS16 KWNO SHORT-RANGE BULLETIN (6-66 HOURS)
FEUS16 KWNO EXTENDED BULLETIN (12-192 HOURS)
FEUS17 KWNO EXTRA-EXTENDED BULLETIN (204-264 HOURS)
FEUS18 KWNO PROBABILISTIC EXTENDED BULLETIN (12-192 HOURS)
NBMV5.0 SBN/NOAAPORT HEADER ADDITIONS AND REMOVALS:
A DETAILED LISTING OF NBM WMO HEADERS (BY NBM DOMAIN) TO BE
ADDED OVER THE SBN/NOAAPORT CAN BE FOUND BELOW:
CO DOMAIN
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238145/HEADERS_ADDED_V
5.0_CO.PDF
AK DOMAIN
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238145/HEADERS_ADDED_V
5.0_AK.PDF
HI DOMAIN
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238145/HEADERS_ADDED_V
5.0_HI.PDF
PR DOMAIN
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238145/HEADERS_ADDED_V
5.0_PR.PDF
GU DOMAIN
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238145/HEADERS_ADDED_V
5.0_GU.PDF
OC DOMAIN
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238145/HEADERS_ADDED_V
5.0_OC.PDF
A DETAILED LISTING OF NBM WMO HEADERS (BY NBM DOMAIN) TO BE
REMOVED FROM THE SBN/NOAAPORT CAN BE FOUND BELOW:
CO DOMAIN
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238145/HEADERS_REMOVED
_V5.0_CO.PDF
AK DOMAIN
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238145/HEADERS_REMOVED
_V5.0_AK.PDF
HI DOMAIN
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238145/HEADERS_REMOVED
_V5.0_HI.PDF
PR DOMAIN
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238145/HEADERS_REMOVED
_V5.0_PR.PDF
GU DOMAIN
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238145/HEADERS_REMOVED
_V5.0_GU.PDF
OC DOMAIN
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238145/HEADERS_REMOVED
_V5.0_OC.PDF
GLOBAL DOMAIN
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238145/HEADERS_REMOVED
_V5.0_GLOBAL.PDF
A. GRIB2 SBN/NOAAPORT OUTPUT ADDITIONS AND REMOVALS:
SBN PRODUCT ADDITIONS AND REMOVALS: CO
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238347/NBM_V5.0_SBN_DE
LETIONS_AND_ADDITIONS_ELEMENTS_PLAIN_LANGUAGE_CONUS.PDF
SBN PRODUCT ADDITIONS AND REMOVALS: AK
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238347/NBM_V5.0_SBN_DE
LETIONS_AND_ADDITIONS_ELEMENTS_PLAIN_LANGUAGE_ALASKA.PDF
SBN PRODUCT ADDITIONS AND REMOVALS: HI
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238347/NBM_V5.0_SBN_DE
LETIONS_AND_ADDITIONS_ELEMENTS_PLAIN_LANGUAGE_HAWAII.PDF
SBN PRODUCT ADDITIONS AND REMOVALS: PR
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238347/NBM_V5.0_SBN_DE
LETIONS_AND_ADDITIONS_ELEMENTS_PLAIN_LANGUAGE_PUERTO_RICO.PDF
SBN PRODUCT ADDITIONS AND REMOVALS: GU
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238347/NBM_V5.0_SBN_DE
LETIONS_AND_ADDITIONS_ELEMENTS_PLAIN_LANGUAGE_GUAM.PDF
SBN PRODUCT ADDITIONS AND REMOVALS: OC
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238347/NBM_V5.0_SBN_DE
LETIONS_AND_ADDITIONS_ELEMENTS_PLAIN_LANGUAGE_OCEANIC.PDF
SBN PRODUCT ADDITIONS AND REMOVALS: GLOBAL
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238347/NBM_V5.0_SBN_DE
LETIONS_AND_ADDITIONS_ELEMENTS_PLAIN_LANGUAGE_GLOBAL_UA.PDF
SBN PRODUCT ADDITIONS AND REMOVALS: TEXT BULLETINS
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238347/NBM_V5.0_SBN_DE
LETIONS_AND_ADDITIONS_ELEMENTS_PLAIN_LANGUAGE_TEXT_PRODUCTS.PDF
NBMV5.0 GRIB2 HEADER IDENTIFIERS DELINEATED BY WEATHER ELEMENT
AND DOMAIN CAN BE FOUND HERE:
NBMV5.0 GRIB2 HEADER SCHEMES
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238145/NBM_V5.0_HEADER
_SCHEME.PDF
B. TEXT BULLETINS ON SBN/NOAAPORT:
NBH, NBS, NBE, NBX, AND NBP WILL CONTINUE TO BE HOSTED ON THE
SBN/NOAAPORT AS IN NBMV4.3. THIS STATION-BASED GUIDANCE COVERS
12-HOUR PERIODS FOR PROJECTIONS 24-192 HOURS AND HAS AN
IDENTICAL FORMAT TO THE NBMV4.3 DETERMINISTIC NBM EXTENDED ASCII
TEXT BULLETINS. NOTE THAT WIND SPEED PERCENTILE INFORMATION
FOUND FOR ALL STATIONS IN THE TEXT BULLETINS ARE FROM THE
FORECASTS MADE IN THE OC DOMAIN, AND NOT THE QUANTILE MAPPING
SYSTEM. THIS IS UNCHANGED FROM THE PREVIOUS VERSION.
HEADER INFORMATION FOR THE PROBABILISTIC AND DETERMINISTIC TEXT
BULLETIN FILES CAN BE FOUND HERE:
NBMV5.0 TEXT BULLETIN HEADER_SCHEMES
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238069/NBM_V5.0_TEXT_P
RODUCT_WMO_HEADER_SCHEME.PDF
7. NCEP WEB SERVICES NOMADS DISSEMINATION
ON IMPLEMENTATION DAY, ALL GRIB2 MASTER (CORE AND QMD) FILES,
INDEX FILES, AND NBM TEXT MESSAGES WILL CONTINUE TO BE HOSTED ON
NCEP WEB SERVICES. PLEASE FOLLOW THE SUBSEQUENT HYPERLINK TO
ACCESS THIS DATA:
HTTPS://NOMADS.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/BLEND/PROD/
PLEASE NOTE THAT THE NAMING CONVENTION AND DIRECTORY STRUCTURE
FOR THE MASTER GRIB2 FILES REMAIN UNCHANGED AND DELINEATE
BETWEEN THE CORE NBM PRODUCTS AND THOSE DERIVED FROM THE QMD
PROCESS.
FILE NAMING CONVENTION:
CORE/BLEND.TCCZ.CORE.FHHH.RG.GRIB2 AND
QMD/BLEND.TCCZ.QMD.FHHH.RG.GRIB2,
WHERE CC=NBM CYCLE TIME, HHH=FORECAST PROJECTION, AND RG=NBM
DOMAIN THAT INCLUDES: CO, AK, HI, PR, OC, GU, GLOBAL (CORE ONLY)
CHANGES TO EXISTING FILES ON NOMADS:
THESE LINKS DETAIL THE ELEMENTS ADDED TO OR REMOVED FROM OUTPUT
THAT IS HOSTED ON NOMADS:
NOMADS CHANGES: CORE BLEND
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238491/NBM_V5.0_NOMADS
_CHANGES_CORE.PDF
NOMADS CHANGES: QMD BLEND
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238491/NBM_V5.0_NOMADS
_CHANGES_QMD.PDF
NOMADS CHANGES: TEXT BULLETINS
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238491/NBM_V5.0_NOMADS
_CHANGES_TEXT.PDF
NOMADS ADDITIONS: FIRE WEATHER
HTTPS://VLAB.NOAA.GOV/DOCUMENTS/6609493/49238491/NBM_V5.0_NOMADS
_CHANGES_JFWPRB.PDF
PRIOR TO IMPLEMENTATION, USERS MAY FIND PARALLEL NBM DATA FOR
DOWNLOAD HERE:
HTTPS://NOMADS.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/BLEND/PARA/
HTTPS://VLAB.NOAA.GOV/WEB/MDL/NBM-TEXT-PRODUCTS
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 GRIB2 FILES, AND ANY VOLUME CHANGES THAT
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.
ANY QUESTIONS, COMMENTS OR REQUESTS REGARDING THIS
IMPLEMENTATION SHOULD BE DIRECTED TO THE CONTACTS BELOW. WE WILL
REVIEW ANY FEEDBACK AND DECIDE WHETHER TO PROCEED.
FOR QUESTIONS REGARDING THE IMPLEMENTATION OF NBM GUIDANCE OR
DATA AVAILABLE ON AMAZON WEB SERVICES, PLEASE CONTACT:
GEOFF MANIKIN
CHIEF, STATISTICAL MODELING DIVISION, MDL
MDL/SILVER SPRING, MARYLAND
GEOFFREY.MANIKIN@NOAA.GOV
OR
DAVID RUDACK
NBM TEAM LEAD
MDL/SILVER SPRING, MARYLAND
DAVID.RUDACK@NOAA.GOV
FOR QUESTIONS REGARDING THE DATA FLOW FOR NWS/NCEP SERVICES,
PLEASE CONTACT:
MARGARET CURTIS
NCEP CENTRAL OPERATIONS DATAFLOW TEAM LEAD
NCEP.PMB.DATAFLOW@NOAA.GOV
A WEB PAGE DESCRIBING THE NBM CAN BE FOUND AT:
HTTPS://VLAB.NOAA.GOV/WEB/MDL/NBM
NATIONAL SERVICE CHANGE NOTICES ARE ONLINE AT:
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