441
NOUS41 KWBC 131540
PNSWSH
SERVICE CHANGE NOTICE 26-64
NATIONAL WEATHER SERVICE HEADQUARTERS SILVER SPRING MD
1140 PM EDT MON JUL 13 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 NATIONAL WATER MODEL AND RELATED POST
PROCESSING SYSTEM ON NWS'S WCOSS SYSTEM EFFECTIVE: AUGUST 12,
2026
EFFECTIVE ON OR ABOUT AUGUST 12TH, 2026, BEGINNING WITH THE 1200
COORDINATED UNIVERSAL TIME (UTC) RUN, THE NATIONAL WEATHER
SERVICE (NWS) WILL BEGIN OPERATIONALLY RUNNING VERSION 3.1 OF
THE NATIONAL WATER MODEL (NWM) ON THE WEATHER AND CLIMATE
OPERATIONAL SUPERCOMPUTING SYSTEM (WCOSS).
THE NWM IS AN HOURLY CYCLING UNCOUPLED ANALYSIS AND FORECAST
SYSTEM THAT PROVIDES STREAMFLOW FOR OVER 3.2 MILLION RIVER
REACHES, TOTAL WATER LEVEL (TWL) GUIDANCE FOR COASTAL REGIONS,
AND OTHER HYDROLOGIC INFORMATION ON GRIDS RANGING IN RESOLUTION
FROM 100M TO 1KM. IT ALSO PROVIDES COMPLEMENTARY HYDROLOGIC
GUIDANCE AT CURRENT NWS RIVER FORECAST CENTER (RFC) RIVER
FORECAST LOCATIONS AND SIGNIFICANTLY EXPANDED GUIDANCE IN
COVERAGE AND TYPE IN UNDERSERVED LOCATIONS. FURTHER INFORMATION
ON THE OBSERVATION- AND MODEL-BASED FORCING SOURCES USED BY THE
NWM, ALONG WITH DETAILS ON THE NWM DOMAIN AND MODELING
COMPONENTS, CAN BE FOUND AT: HTTPS://WATER.NOAA.GOV/ABOUT/NWM
THE NWM POST-PROCESSING APPLICATION INGESTS RAW NWM CHANNEL,
LAND AND FORCING FILES AND THEN CREATES SUBSETTED DATA FILES AND
DERIVED VARIABLES FOR NWS RIVER FORECAST CENTERS AND WEATHER
FORECAST OFFICES. THE SUBSETTING OF DATA IS INTENDED TO REDUCE
SYSTEM AND NETWORK RESOURCE USAGE IN OBTAINING CRITICAL NWM DATA
OF INTEREST. THIS POST-PROCESSING ALSO SUPPORTS OFFICE OF WATER
PREDICTION (OWP) WEB SERVICES AND OPERATIONS WITH MAP SERVICE
DATA FOR SELECT NWM VARIABLES.
(A) ENHANCEMENTS IN THE MODEL VERSION 3.1
VERSION 3.1 OF THE NWM CONTAINS SEVERAL NOTABLE UPGRADES OVER
THE CURRENT OPERATIONAL VERSION. THESE INCLUDE:
CONUS DOMAIN
-REPRESENTATION OF THE FLOW DIVERSION BETWEEN THE MISSISSIPPI
AND ATCHAFALAYA RIVERS VIA OBSERVATION-BASED FLOW PERSISTENCE
THROUGH THE OLD RIVER CONTROL STRUCTURE. WATER IS DIVERTED FROM
GAUGE 07381482 BY REMOVING WATER FROM FEATUREID 19269940 AND
ADDING IT TO FEATUREID 19406874. THE DIVERSION USES THE LAST
OBSERVED STREAMFLOW VALUES AT THE GAUGE (07381482) AND PERSISTS
THE STREAMFLOW.
-IMPROVED DOWNSCALING OF TEMPERATURE FORCING DATA VIA AN NWP
MODEL DATA-BASED DYNAMIC LAPSE RATE APPROACH
-USE OF MULTI-RADAR/MULTI-SENSOR SYSTEM (MRMS)AND NUMERICAL
WEATHER PREDICTION (NWP)-BASED PRECIPITATION-TYPE INFORMATION
WITHIN CONUS ANALYSIS AND ASSIMILATION (ANA), SHORT-RANGE, AND
GFS-BASED MEDIUM-RANGE CONFIGURATIONS
-INCORPORATION OF FIELD FEEDBACK ON STANDARD HYDROMETEOROLOGICAL
EXCHANGE FORMAT (SHEF) OUTPUT LOCATIONS (25 NEW LOCATIONS, ONE
SHIFTED LOCATION)
-ALTERATION OF MEDIUM-RANGE COASTAL ATLANTIC GULF AND PACIFIC
DOMAIN FORECAST LENGTHS FROM 10 DAYS TO 5 DAYS TO DECREASE RUN
TIME AND OUTPUT LATENCY BY ~70% WHEN COMBINED WITH SOFTWARE
OPTIMIZATION MENTIONED BELOW
-INCLUSION OF UPDATED ATLANTIC-GULF TOPOGRAPHY-BATHYMETRY DATA
FOR THE COASTAL MODEL ALONG PORTIONS OF THE FLORIDA, NORTH
CAROLINA, VIRGINIA, AND MARYLAND COASTLINES
-USE OF BIAS-CORRECTED STOFS 2D MODEL DATA AS BOUNDARY CONDITION
INPUT INTO THE NWM COASTAL TOTAL WATER LEVEL (TWL) COMPONENT
-UPDATED NWM CONUS HYDROFABRIC WITH LOCATION REFINEMENTS FOR 311
USGS STREAM GAUGES, IMPROVING THEIR REPRESENTATION IN THE NWM
ANALYSIS AND ASSIMILATION CONFIGURATION.
-ADDRESSING NWS FIELD HYDROFABRIC-RELATED REQUESTS, ASSIMILATION
OF GAUGE DATA FOR THE TRINITY RIVER AT LIBERTY TEXAS, THE
NIAGARA RIVER NEAR BUFFALO NEW YORK, ALONG WITH ROUTING FIXES
FOR THE SABINE RIVER NEAR CARTHAGE TEXAS, THE MILL RACE NEAR
AMANA IOWA, AND THE KANKAKEE RIVER NEAR SHELBY INDIANA.
PUERTO RICO / USVI DOMAIN
-NEW P-SURGE-FORCED SHORT-RANGE COASTAL FORECAST CONFIGURATION,
EXECUTED WHEN P-SURGE DATA IS AVAILABLE
- USE OF NBM PRECIPITATION IN PUERTO RICO SHORT-RANGE
CONFIGURATIONS IN PLACE OF WRF-ARW AS SUPPLEMENTAL PRECIPITATION
FORCING FOR INLAND AND COASTAL CONFIGURATIONS.
-NEW 00Z AND 12Z SHORT-RANGE FORECAST CYCLES FOR BOTH INLAND AND
COASTAL CONFIGURATIONS.
ALL DOMAINS
-SIGNIFICANT DECREASE IN COASTAL MODEL RUNTIME VIA CODE
OPTIMIZATION (SEE SECTION D)
- APPLICATION OF COASTAL MODEL SINK TERM BEYOND THE 2M TOPOBATHY
LINE TO REDUCE PONDING OF WATER IN DEM PITS
-ASSIMILATION OF USGS STREAMFLOW OBSERVATIONS AVAILABLE AT THE
FORECAST EXECUTION TIME INTO THE CORRESPONDING BEGINNING HOURS
OF THE NWM SHORT-, MEDIUM-, AND LONG-RANGE FORECASTS. THE
INITIAL FORECAST PERIOD OVERLAPPING WITH AVAILABLE OBSERVATIONS
WILL THUS TRACK OBSERVED VALUES
(B) MODEL OUTPUT CHANGES
MODEL OUTPUT IS AVAILABLE VIA NWS WEB SERVICES HERE:
HTTPS://NOMADS.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/NWM
B1. ADDITIONS TO EXISTING FILES
- A NEW LQFRAC VARIABLE ADDED IN V3.1 (NOT PRESENT IN V3.0)
FOR CONUS ANALYSIS AND ASSIMILATION, SHORT-RANGE, AND MEDIUM-
RANGE FORCING CONFIGURATIONS.
B2. ALTERED DURATION OF EXISTING FORECAST RUN
- THE MEDIUM_RANGE_BLEND_COASTAL_RR AND
MEDIUM_RANGE_COASTAL_RR_MEM1 DIRECTORIES REDUCED THE NUMBER OF
FORECAST HOURS FROM 240 TO 120.
NWM.TCCZ.MEDIUM_RANGE_BLEND_COASTAL.TOTAL_WATER.FFFF.RR.NC
NWM.TCCZ.MEDIUM_RANGE_COASTAL.TOTAL_WATER.FFFF.RR.NC
WHERE RR IS DOMAIN (ATLGULF,PACIFIC), CC IS CYCLE
(00,06,12,18), AND FFF IS FORECAST HOUR (001-120)
B3. NEW COASTAL P-SURGE-FORCED TOTAL WATER LEVEL OUTPUT FOR
SHORT-RANGE PUERTO RICO AND NDFD MEDIUM-RANGE ATLGULF DOMAINS.
NEW ELEMENTS IN THE NEW FILES ARE DETAILED IN APPENDIX 2 AT THE
END OF THIS NOTICE.
- COASTAL P-SURGE SHORT RANGE FILE IN
SHORT_RANGE_COASTAL_PUERTORICO_PSURGE/
NWM.TCCZ.SHORT_RANGE_COASTAL.TOTAL_WATER.PSURGE.FFFF.PUER
TORICO.NC
NWM.TCCZ.SHORT_RANGE_COASTAL.TOTAL_WATER.PSURGE.PUERTORIC
O.SHEF
WHERE CC IS THE CYCLE (00,06,12,18), AND FFF IS FORECAST
HOUR (001-048) FOR PUERTO RICO.NOTE THAT ONLY THE 00Z
AND 12Z CYCLES ARE NEW FOR THE PUERTO RICO DOMAIN.
NOTE: THESE OUTPUT FILES AND ASSOCIATED OUTPUT DIRECTORY
ARE ONLY CREATED WHEN UPSTREAM PSURGE FORCING DATA IS
AVAILABLE AND THIS PARTICULAR NWM CONFIGURATION EXECUTES.
(C) POST-PROCESSING APPLICATION OUTPUT CHANGES
C1. POST-PROCESSED FILES ARE NOW AVAILABLE IN DIRECTORIES TAGGED
BY DATE, WHERE YYYY REPRESENTS THE FOUR-DIGIT YEAR OF OUTPUT, MM
REPRESENTS THE TWO-DIGIT MONTH OF OUTPUT, AND DD REPRESENTS THE
TWO-DIGIT DAY OF OUTPUT. NOTE THAT THE DATE HAS BEEN REMOVED
FROM THE NAME OF EACH POST-PROCESSED FILE, AND NOW RESIDES IN
THE DIRECTORY NAME (I.E., NWM.YYYYMMDD).
C2. NOTE THAT THE IMAGES SUB-DIRECTORY IS BEING REMOVED FROM THE
POST-PROCESSED DATA POINT. THIS WILL ELIMINATE PRE-GENERATED
PNG IMAGES OF SEVERAL NWM OUTPUT FIELDS PREVIOUSLY HOSTED IN
THIS LOCATION.ADDITIONALLY, THE STREAMFLOW_ANOMALY FIELD WILL
NO LONGER BE AVAILABLE IN THE WMS DIRECTORY.
C3. THE POST-PROCESSED WEB MAP SERVICE (WMS) DATA WILL BE
AVAILABLE ON THE NWS WEB SERVICES HERE:
HTTPS://NOMADS.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/NWM/PROD/
NWM.YYYYMMDD/POST_PROCESSED/WMS/
- ANALYSIS AND ASSIMILATION FILES IN
ANALYSIS_ASSIM/FORCING/
NWM.T{00..23}Z.ANALYSIS_ASSIM.FORCING.TM{00,01,02}.ALASKA.N
C
NWM.T{00..23}Z.ANALYSIS_ASSIM.FORCING.TM00.CONUS.NC
NWM.T{00..23}Z.ANALYSIS_ASSIM.FORCING.TM00.HAWAII.NC
NWM.T{00..23}Z.ANALYSIS_ASSIM.FORCING.TM00.PUERTORICO.NC
ANALYSIS_ASSIM/CHANNEL_RT/
NWM.T{00..23}Z.ANALYSIS_ASSIM.CHANNEL_RT.TM{00,01,02}.ALASK
A.NC
NWM.T{00..23}Z.ANALYSIS_ASSIM.CHANNEL_RT.TM00.CONUS.NC
NWM.T{00..23}Z.ANALYSIS_ASSIM.CHANNEL_RT.TM{0000,0015,0030,
0045}.HAWAII.NC
NWM.T{00..23}Z.ANALYSIS_ASSIM.CHANNEL_RT.TM00.PUERTORICO.NC
ANALYSIS_ASSIM/LAND/
NWM.T{00..23}Z.ANALYSIS_ASSIM.LAND.TM{00,01,02}.ALASKA.NC
NWM.T{00..23}Z.ANALYSIS_ASSIM.LAND.TM00.CONUS.NC
NWM.T{00..23}Z.ANALYSIS_ASSIM.LAND.TM{0000,0015,0030,0045}.
HAWAII.NC
NWM.T{00..23}Z.ANALYSIS_ASSIM.LAND.TM00.PUERTORICO.NC
- EXTENDED ANALYSIS AND ASSIMILATION FILES IN
ANALYSIS_ASSIM_EXTEND/FORCING/
NWM.T20Z.ANALYSIS_ASSIM_EXTEND.FORCING.TM{00..31}.ALASKA.NC
ANALYSIS_ASSIM_EXTEND/LAND/
NWM.T20Z.ANALYSIS_ASSIM_EXTEND.LAND.TM00.ALASKA.NC
- SHORT RANGE FILES IN
SHORT_RANGE/FORCING/
NWM.T{00,03,..21}Z.SHORT_RANGE.FORCING.15HOURS.ALASKA.NC
NWM.T{00..23}Z.SHORT_RANGE.FORCING.18HOURS.CONUS.NC
NWM.T{00,12}Z.SHORT_RANGE.FORCING.48HOURS.HAWAII.NC
NWM.T{00,12}Z.SHORT_RANGE.FORCING.{DAY1,DAY2}.HAWAII.NC
NWM.T{00,06,12,18}Z.SHORT_RANGE.FORCING.48HOURS.PUERTORICO.
NC
NWM.T{00,06,12,18}Z.SHORT_RANGE.FORCING.{DAY1,DAY2}.PUERTOR
ICO.NC
SHORT_RANGE/CHANNEL_RT/
NWM.T{00,03..21}Z.SHORT_RANGE.CHANNEL_RT.ALASKA.NC
NWM.T{00..23}Z.SHORT_RANGE.CHANNEL_RT.CONUS.NC
NWM.T{00,12}Z.SHORT_RANGE.CHANNEL_RT.HAWAII.NC
NWM.T{00,06,12,18}Z.SHORT_RANGE.CHANNEL_RT.PUERTORICO.NC
- MEDIUM-RANGE FILES IN
MEDIUM_RANGE/FORCING/
NWM.T{00,06,12,18}Z.MEDIUM_RANGE.FORCING.DAY{1..10}.ALASKA.
NC
NWM.T{00,06,12,18}Z.MEDIUM_RANGE.FORCING.DAY{1..10}.CONUS.N
C
MEDIUM_RANGE/CHANNEL_RT/
NWM.T{00,06,12,18}Z.MEDIUM_RANGE.CHANNEL_RT_{1..6}.ALASKA.N
C
NWM.T{00,06,12,18}Z.MEDIUM_RANGE.CHANNEL_RT.ALASKA.NC
NWM.T{00,06,12,18}Z.MEDIUM_RANGE.CHANNEL_RT_{1..6}.CONUS.NC
NWM.T{00,06,12,18}Z.MEDIUM_RANGE.CHANNEL_RT.CONUS.NC
- BLEND MEDIUM RANGE FILES IN
MEDIUM_RANGE_BLEND/FORCING/
NWM.T{00,06,12,18}Z.MEDIUM_RANGE_BLEND.FORCING.DAY{1..10}.A
LASKA.NC
NWM.T{00,06,12,18}Z.MEDIUM_RANGE_BLEND.FORCING.DAY{1..10}.C
ONUS.NC
MEDIUM_RANGE_BLEND/CHANNEL_RT/
NWM.T{00,06,12,18}Z.MEDIUM_RANGE_BLEND.CHANNEL_RT.ALASKA.NC
NWM.T{00,06,12,18}Z.MEDIUM_RANGE_BLEND.CHANNEL_RT.CONUS.NC
- LONG-RANGE FILES IN
LONG_RANGE/CHANNEL_RT/
NWM.T{00,06,12,18}Z.LONG_RANGE.CHANNEL_RT_{1..4}.CONUS.NC
NWM.T{00,06,12,18}Z.LONG_RANGE.CHANNEL_RT.CONUS.NC
C4. THE POST-PROCESSED DATA FOR THE 13 RIVER FORECAST CENTERS
(RFC) WILL BE AVAILABLE VIA THE NWS WEB SERVICES HERE:
HTTPS://NOMADS.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/NWM/PROD/
NWM.YYYYMMDD/POST_PROCESSED/RFC/
- CONUS DOMAIN FILES ARE IN THE AB, CB, CN, LM, MA, MB, NC,
NE, NW, OH, SE, WG DIRECTORIES:
CHANNEL_RT/
NWM.T{00..23}Z.ANALYSIS_ASSIM.CHANNEL_RT.TM{00,01,02}.RRRFC
.NC
NWM.T{00..23}Z.ANALYSIS_ASSIM_NO_DA.CHANNEL_RT.TM{00,01,02}
.RRRFC.NC
NWM.T{00..23}Z.ANALYSIS_ASSIM_LONG.CHANNEL_RT.TM{00..11}.RR
RFC.NC
NWM.T{00..23}Z.ANALYSIS_ASSIM_LONG_NO_DA.CHANNEL_RT.TM{00..
11}.ABRFC.NC
NWM.T16Z.ANALYSIS_ASSIM_EXTEND.CHANNEL_RT.TM{00..27}.RRRFC.
NC
NWM.T16Z.ANALYSIS_ASSIM_EXTEND_NO_DA.CHANNEL_RT.TM{00..27}.
RRRFC.NC
NWM.T{00,06,12,18}Z.LONG_RANGE.CHANNEL_RT_{1..4}.RRRFC.NC
NWM.T{00,06,12,18}Z.MEDIUM_RANGE_BLEND.CHANNEL_RT.RRRFC.NC
NWM.T{00,06,12,18}Z.MEDIUM_RANGE.CHANNEL_RT_{1..6}.RRRFC.NC
NWM.T{00,06,12,18}Z.MEDIUM_RANGE_NO_DA.CHANNEL_RT.RRRFC.NC
NWM.T{00,06,12,18}Z.SHORT_RANGE.CHANNEL_RT.RRRFC.NC
WHERE RR IS THE RFC NAME (AB).
LAND/
NWM.T{00..23}Z.ANALYSIS_ASSIM.LAND.TM{00,01,02}.RRRFC.NC
NWM.T16Z.ANALYSIS_ASSIM_EXTEND.LAND.TM{00..27}.RRRFC.NC
NWM.T{00,06,12,18}Z.ANALYSIS_ASSIM_LONG.LAND.TM{00..11}.RRR
FC.NC
NWM.T{00,06,12,18}Z.LONG_RANGE.LAND_{1..4}.F{024,048,..,720
}.RRRFC.NC
NWM.T{00,06,12,18}Z.MEDIUM_RANGE_BLEND.LAND.F{003,006,..,24
0}.RRRFC.NC
NWM.T{00,06,12,18}Z.MEDIUM_RANGE.LAND_1.F{003,006,..,240}.R
RRFC.NC
NWM.T{00,06,12,18}Z.MEDIUM_RANGE.LAND_{2..6}.F{003,006,..,2
04}.RRRFC.NC
NWM.T{00..23}Z.SHORT_RANGE.LAND.F{001..018}.RRRFC.NC
WHERE RR IS THE RFC NAME (AB).
FORCING/
NWM.T{00..23}Z.ANALYSIS_ASSIM.FORCING.TM{00,01,02}.RRRFC.NC
NWM.T{00,06,12,18}Z.MEDIUM_RANGE.FORCING.F{001..240}.RRRFC.
NC
NWM.T{00,06,12,18}Z.MEDIUM_RANGE_BLEND.FORCING.F{001..240}.
RRRFC.NC
NWM.T{00,06,12,18}Z.SHORT_RANGE.FORCING.F{001..018}.RRRFC.N
C
WHERE RR IS THE RFC NAME (AB).
- ALASKA AND HAWAII DOMAINS FILES ARE IN THE AP DIRECTORY.
CHANNEL_RT/
NWM.T{00..23}Z.ANALYSIS_ASSIM.CHANNEL_RT.TM{00,01,02}.ALASK
A.APRFC.NC
NWM.T{00..23}Z.ANALYSIS_ASSIM_NO_DA.CHANNEL_RT.TM{00,01,02
}.ALASKA.APRFC.NC
NWM.T20Z.ANALYSIS_ASSIM_EXTEND.CHANNEL_RT.TM{00..31}.ALASKA
.APRFC.NC
NWM.T20Z.ANALYSIS_ASSIM_EXTEND_NO_DA.CHANNEL_RT.TM{00..31}.
ALASKA.APRFC.NC
NWM.T{00,03,..21}Z.SHORT_RANGE.CHANNEL_RT.ALASKA.APRFC.NC
NWM.T{00,06,12,18}Z.MEDIUM_RANGE.CHANNEL_RT_{1..6}.ALASKA.A
PRFC.NC
NWM.T{00,06,12,18}Z.MEDIUM_RANGE_NO_DA.CHANNEL_RT.ALASKA.AP
RFC.NC
NWM.T{00,06,12,18}Z.MEDIUM_RANGE_BLEND.CHANNEL_RT.ALASKA.AP
RFC.NC
NWM.T{00..23}Z.ANALYSIS_ASSIM.CHANNEL_RT.TM{0000,0015,..,02
45}.HAWAII.APRFC.NC
NWM.T{00..23}Z.ANALYSIS_ASSIM_NO_DA.CHANNEL_RT.TM{0000,0015
,..,0245}.HAWAII.APRFC.NC
NWM.T{00,12}Z.SHORT_RANGE.CHANNEL_RT.APRFC.NC
NWM.T{00,12}Z.SHORT_RANGE_NO_DA.CHANNEL_RT.APRFC.NC
LAND/
NWM.T{00..23}Z.ANALYSIS_ASSIM.LAND.TM{00,01,02}.ALASKA.APRF
C.NC
NWM.T{00,06,12,18}Z.SHORT_RANGE.LAND.F{001..015}.ALASKA.APR
FC.NC
NWM.T{03,09,15,21}Z.SHORT_RANGE.LAND.F{001..045}.ALASKA.APR
FC.NC
NWM.T{00..23}Z.ANALYSIS_ASSIM.LAND.TM{0000,0100,0200}.APRFC
.NC
NWM.T{00,12}Z.SHORT_RANGE.LAND.F{00100..04800}.APRFC.NC
FORCING/
NWM.T{00..23}Z.ANALYSIS_ASSIM.FORCING.TM{00,01,02}.ALASKA.A
PRFC.NC
NWM.T20Z.ANALYSIS_ASSIM_EXTEND.FORCING.TM{00..31}.ALASKA.AP
RFC.NC
NWM.T{00,06,12,18}Z.SHORT_RANGE.FORCING.F{001..015}.ALASKA.
APRFC.NC
NWM.T{03,09,15,21}Z.SHORT_RANGE.FORCING.F{001..045}.ALASKA.
APRFC.N
NWM.T{00,06,12,18}Z.MEDIUM_RANGE.FORCING.F{001..240}.ALASKA
.APRFC.NC
NWM.T{00,06,12,18}Z.MEDIUM_RANGE_BLEND.FORCING.F{001..240}.
ALASKA.APRFC.NC
NWM.T{00..23}Z.ANALYSIS_ASSIM.FORCING.TM{00,01,02}.APRFC.NC
NWM.T{00,12}Z.SHORT_RANGE.FORCING.F{001..048}.APRFC.NC
- PUERTO RICO DOMAIN FILES ARE IN THE SE DIRECTORY.
CHANNEL_RT/
NWM.T{00..23}Z.ANALYSIS_ASSIM.CHANNEL_RT.TM{00,01,02}.PUERT
ORICO.SERFC.NC
NWM.T{00..23}Z.ANALYSIS_ASSIM_NO_DA.CHANNEL_RT.TM{00,01,02}
.PUERTORICO.SERFC.NC
NWM.T{00,06,12,18}Z.SHORT_RANGE.CHANNEL_RT.PUERTORICO.SERFC
.NC
NWM.T{00,06,12,18}Z.SHORT_RANGE_NO_DA.CHANNEL_RT.PUERTORICO
.SERFC.NC
LAND/
NWM.T{00..23}Z.ANALYSIS_ASSIM.LAND.TM{00,01,02}.PUERTORICO.
SERFC.NC
NWM.T{00,06,12,18}Z.SHORT_RANGE.LAND.F{001..048}.PUERTORICO
.SERFC.NC
FORCING/
NWM.T{00..23}Z.ANALYSIS_ASSIM.FORCING.TM{00,01,02}.PUERTORI
CO.SERFC.NC
NWM.T{00,06,12,18}Z.SHORT_RANGE.FORCING.F{001..048}.PUERTOR
ICO.SERFC.NC
(D) TIMING CHANGES
WITH THE IMPLEMENTATION OF NWM V3.1, THE TIMING OF NWM OUTPUT
DISSEMINATION WILL CHANGE AS FOLLOWS (DIRECTORY/FILENAME):
D1. COASTAL PUERTO RICO SHORT RANGE FILES - UP TO 21 MINUTES
EARLIER
SHORT_RANGE_COASTAL_PUERTORICO/NWM.*.TOTAL_WATER.F*.PUERTOR
ICO.NC
SHORT_RANGE_COASTAL_PUERTORICO/NWM.*.TOTAL_WATER.PUERTORICO
.SHEF
D2. COASTAL ATLGULF SHORT RANGE FILES - UP TO 6 MINUTES EARLIER
SHORT_RANGE_COASTAL_ATLGULF/NWM.*.TOTAL_WATER.F*.ATLGULF.NC
SHORT_RANGE_COASTAL_ATLGULF/NWM.*.TOTAL_WATER.ATLGULF.SHEF
D3. COASTAL ATLGULF MEDIUM RANGE FILES - UP TO 325 MINUTES
EARLIER
MEDIUM_RANGE_COASTAL_ATLGULF_MEM1/NWM.*.TOTAL_WATER.F*.ATLG
ULF.NC
MEDIUM_RANGE_COASTAL_ATLGULF_MEM1/NWM.*.TOTAL_WATER.ATLGULF
.SHEF
D4. COASTAL PACIFIC MEDIUM RANGE FILES - UP TO 145 MINUTES
EARLIER
MEDIUM_RANGE_COASTAL_PACIFIC_MEM1/NWM.*.TOTAL_WATER.F*.PACI
FIC.NC
MEDIUM_RANGE_COASTAL_PACIFIC_MEM1/NWM.*.TOTAL_WATER.PACIFIC
.SHEF
D5. HAWAII SHORT RANGE FORECAST FILES - UP TO 7 MINUTES EARLIER
SHORT_RANGE_HAWAII/NWM.*.{CHANNEL_RT,TERRAIN_RT,LAND,RESERV
OIR}.F*.HAWAII.NC
D6. ALASKA MEDIUM RANGE FORECAST FILES - UP TO 6 MINUTES EARLIER
MEDIUM_RANGE_ALASKA_MEM*/NWM.*.{CHANNEL_RT,TERRAIN_RT,LAND,
RESERVOIR}.F*.ALASKA.NC
D7. ALASKA BLEND MEDIUM RANGE FORECAST FILES - UP TO 6 MINUTES
EARLIER
MEDIUM_RANGE_BLEND_ALASKA/NWM.*.{CHANNEL_RT,TERRAIN_RT,LAND
,RESERVOIR}.F*.ALASKA.NC
D8. CONUS LONG RANGE FORECAST FILES - UP TO 10 MINUTES EARLIER
LONG_RANGE_MEM*/NWM.*.{CHANNEL_RT,TERRAIN_RT,LAND,RESERVOIR
}.F*.CONUS.NC
(E) OWP WATER WEBSITE VISUALIZATION SERVICES
END USERS ARE ABLE TO VISUALIZE SEVERAL NWM OUTPUTS VIA THE
INTERACTIVE MAP AND IMAGE VIEWER ON THE OFFICE OF WATER
PREDICTION (OWP) WEBSITE:
HTTPS://WATER.NOAA.GOV/
(F) OTHER INFORMATION AND CONTACTS
AS IN V3.1, USERS WILL FIND THAT LONG RANGE PRODUCTS HAVE ENOUGH
OF A LAG TIME IN CREATION THAT THEY MAY APPEAR IN THE PREVIOUS
DAY S OUTPUT DIRECTORY. FOR EXAMPLE, LONG RANGE MEM 1 PRODUCTS
FOR THE 18Z CYCLE WILL NOT SHOW UP UNTIL THE DAY AFTER THEIR
INITIALIZATION TIME. FOR THIS REASON, USERS ARE ENCOURAGED TO
LOOK BACK IN THE PREVIOUS DATED DIRECTORY FOR LONG RANGE PRODUCT
AVAILABILITY.
MOST NWM NETCDF OUTPUT FILES ARE DIRECTLY VIEWABLE USING
STANDARD NETCDF VISUALIZATION UTILITIES. THE EXCEPTION ARE THE
POINT-TYPE NWM CHANNEL OUTPUT FILES CONTAINING STREAMFLOW AND
OTHER VARIABLES. IN PARTICULAR, DUE TO STORAGE SPACE
LIMITATIONS, THE LATITUDE AND LONGITUDE OF EACH POINT ARE STORED
OUTSIDE OF THE FILE, BUT ARE AVAILABLE AT:
HTTPS://WWW.NOHRSC.NOAA.GOV/PUB/STAFF/KEICHER/NWM_LIVE/WEB/DATA_
TOOLS/NWM_CHANNEL_HYDROFABRIC.TAR.GZ
THIS ARCHIVE CONTAINS AN ESRI FILE GEODATABASE (GDB), WHICH
PROVIDES FULL GEOSPATIAL INFORMATION FOR ALL NWM STREAM REACHES.
THE GDB FILE CAN EASILY BE USED WITH ESRI ARCGIS SOFTWARE, AND
OTHER GIS SOFTWARE, TO ASSOCIATE THE CORRECT GEOSPATIAL DATA
WITH NWM CHANNEL_RT DATA BY FEATURE_ID. A FULL TEXT DESCRIPTION
OF THE GDB CONTENTS AND BASIC USE INSTRUCTIONS ARE AVAILABLE AS
A SEPARATE FILE IN THE ARCHIVE.
A CONSISTENT PARALLEL FEED OF NWM MODEL DATA WILL BE AVAILABLE
ON THE NWS SERVERS VIA THE FOLLOWING URLS:
HTTPS://NOMADS.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/NWM/PARA
AND HERE FOR THE PARALLEL POST-PROCESSED DATA:
HTTPS://NOMADS.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/NWM/PARA/NWM.YYYY
MMDD/POST_PROCESSED/
NWS ENCOURAGES ALL USERS TO ENSURE THEIR DECODERS ARE FLEXIBLE
AND ARE ABLE TO ADEQUATELY HANDLE CHANGES IN CONTENT ORDER AND
ALSO ANY VOLUME CHANGES WHICH MAY BE FORTHCOMING. THESE ELEMENTS
MAY CHANGE WITH FUTURE NWS MODEL IMPLEMENTATIONS. THE NWS WILL
MAKE EVERY ATTEMPT TO ALERT USERS TO THESE CHANGES PRIOR TO ANY
IMPLEMENTATIONS.
ANY QUESTIONS REGARDING THIS IMPLEMENTATION SHOULD BE DIRECTED
BELOW. WE WILL EVALUATE ANY FEEDBACK AND DECIDE WHETHER TO
PROCEED.
FOR QUESTIONS ON THE SCIENCE ASPECTS OF THE NWM OR POST-
PROCESSING DERIVED VARIABLES AND GENERAL PRODUCT FORMAT AND
PROCESSING, PLEASE CONTACT:
BRIAN COSGROVE
OWP/SERVICE DEVELOPMENT DIVISION (S2D)
SILVER SPRING, MD
BRIAN.COSGROVE@NOAA.GOV
FOR QUESTIONS REGARDING THE DATA FLOW ASPECTS OF THE MODEL DATA,
PLEASE CONTACT:
MARGARET CURTIS
NWS DATAFLOW TEAM LEAD
NCEP.PMB.DATAFLOW@NOAA.GOV
APPENDICES
APPENDIX 1, HYDROFABRIC CHANGES.
A1.1)FLOW PATH CHANGES
THE "TO" VARIABLE HAS CHANGED IN THE ROUTELINK_CONUS.NC FILES
FOR SOME LOCATIONS AND ARE MAPPED FROM NWMV3.0 TO NWMV3.1 IN THE
LIST BELOW. WHERE THIS OCCURS, THE FLOW PATH HAS CHANGED,
IMPACTING DOWNSTREAM LOCATIONS.
NWMV3.1 REACHID <> NWMV3.0 REACHID
5279236 <> 5279226
1566046 <> 1566048
5279242 <> 5279236
5279242 <> 5279226
5279236 <> 5279240
5279226 <> 5279240
13437921 <> 13438395
17540557 <> 17540339
A1.2) DROPPED GAUGES
GAUGE 04216000 HAS BEEN DROPPED FROM NWMV3.0
A1.3) ADDED GAUGES
THE FOLLOWING PROVIDES A LIST OF GAUGES THAT HAVE BEEN ADDED TO
THE ROUTELINK V3.1:
08042515
08077110
08077670
08189520
08041970
08111006
08070550
08077640
08117375
08031020
08078400
08163880
08068020
08042455
08067520
08189718
08111051
08162580
08098295
08111085
08068025
08070900
08117857
08169778
08111090
08110520
08189590
08108710
08111080
08164150
08164200
08180990
08065080
08066380
08163720
08164410
08065420
08042539
08076990
08065340
08066138
08070220
08117858
08097000
08108705
08111056
08163900
08066087
08067280
08078890
08064990
08109310
08031005
08042468
08041940
08077888
08117403
08111110
08042470
08067505
08041788
08041945
08065925
08065700
08065820
08078910
08189298
08100950
08173210
08189320
08078935
08065310
08067653
08102730
08111070
08041790
08030530
08067000
06659500
02HA013
A1.4) GAUGE CHANGES
- THE LINK FOR GAUGE "02CD006" HAS CHANGED FROM "41011866" TO
"41011791" IN THE ROUTELINK FILE.
- GAUGE "02HA013" LISTED AS NEW IN SECTION A1.3 IS REPLACING
GAUGE "04216000" PREVIOUSLY USED IN NWMV3.0.
- FOUR GAUGES WERE CORRECTED AS SHOWN IN THE FOLLOWING TABLE:
NWS_LID GAGE_ID CORRECT_REACH_ID
ATOK1 07166500 20955128
IOLK1 07183000 20897397
GCBG1 02191227 6278163
KLMC1 11530500 4440630
APPENDIX 2, NEW NWM COASTAL TOTAL WATER LEVEL OUTPUT. NOTE: THE
TABLES IN THE LINK BELOW SHOW THE COLUMNS LABELED "DATA TYPE",
"PARAMETER", "LONG NAME", AND "UNITS".
- COASTAL PSURGE SHORT-RANGE PUERTO RICO FILES: LIST OF
COASTAL OUTPUT VARIABLES LISTED HERE:
HTTPS://WWW.NCO.NCEP.NOAA.GOV/PMB/PRODUCTS/NWM/
NWS NATIONAL SERVICE CHANGE NOTICES ARE ONLINE AT:
HTTPS://WWW.WEATHER.GOV/NOTIFICATION/
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