NOUS41 KWBC 151624
PNSWSH

TECHNICAL IMPLEMENTATION NOTICE 08-11
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
1130 AM EST FRI FEB 15 2008

TO:	  FAMILY OF SERVICES /FOS/ SUBSCRIBERS...NOAA WEATHER 
	  WIRE SERVICE /NWWS/ SUBSCRIBERS...EMERGENCY MANAGERS 
	  WEATHER INFORMATION NETWORK /EMWIN/ SUBSCRIBERS... 
	  NOAAPORT SUBSCRIBERS...OTHER NATIONAL WEATHER SERVICE 
	  /NWS/ PARTNERS AND OTHER USERS...NWS EMPLOYEES

FROM:	  PAUL HIRSCHBERG
	  CHIEF...SCIENCE PLANS BRANCH
	  OFFICE OF SCIENCE AND TECHNOLOGY /OST/

SUBJECT:  GREAT LAKES WAVE MODEL IMPLEMENTED...EFFECTIVE MARCH 25 
	  2008 

EFFECTIVE TUESDAY MARCH 25 2008...AT 1200 COORDINATED UNIVERSAL 
TIME /UTC/...THE NATIONAL CENTERS FOR ENVIRONMENTAL PREDICTION 
/NCEP/ WILL IMPLEMENT THE GREAT LAKES WAVE MODEL /GLWM/ INTO 
OPERATIONS.

PARALLEL DATA IS AVAILABLE ON THE NCEP FTP SERVER. THIS DATA CAN 
BE USED TO EVALUATE THE MODEL DURING PARALLEL OPERATIONS. PLEASE 
SEND FEEDBACK TO JOHN.WARD@NOAA.GOV.

THE DATA IS AVAILABLE AT /USE LOWER CASE LETTERS/:

     FTP://FTP.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/WAVE/PARA/
     WAVE.YYYYMMDD/GLW.GRL.TCCZ.GRIB2

WHERE CC /LOCATED BETWEEN THE T AND Z/ IS 00 OR 06 OR 12 OR 18.

THE GLWM MODEL WILL USE THE THIRD GENERATION WIND WAVE MODEL 
WAVEWATCH III THAT IS CURRENTLY USED TO DRIVE THE MULTI – GRID 
GLOBAL WAVE FORECAST MODEL. GLWM WILL CONSIST OF A SINGLE GRID 
FOR THE GREAT LAKES AT A RESOLUTION OF 3 MINUTES IN LONGITUDE AND 
2.1 MINUTES IN LATITUDE. GLWM WILL CONSIST OF 4 CYCLES PER DAY 
WHICH ARE 00Z...06Z...12Z AND 18Z. EACH CYCLE WILL BE RUN USING 
THE NAM HOURLY WINDS OUT TO 84 HOURS. A PARTITIONING ALGORITHM IS 
USED TO PROPERLY PARTITION THE ENERGY SPECTRA. FIELD OUTPUT WILL 
BE PROVIDED IN GRIB2 FORMAT ON AN HOURLY TEMPORAL RESOLUTION AND 
WILL INCLUDE THE FOLLOWING FIELDS: 
       
     1. WIND SPEED AND DIRECTION
     2. WIND VELOCITIES /U AND V/
     3. SIGNIFICANT WAVE HEIGHT
     4. MEAN WAVE DIRECTION
     5. PEAK PERIOD
     6. PEAK PERIOD...WAVE DIRECTION AND SIGNIFICANT WAVE      
     HEIGHT OF PARTITIONED SPECTRA. SPECTRA ARE CURRENTLY  
     PARTITIONED INTO A WAND WAVE COMPONENT, A PRIMARY SWELL      
     COMPONENT AND A SECONDARY SWELL COMPONENT. MORE   
     PARTITIONED FIELD COMPONENTS CAN BE ADDED TO THE OUTPUT  
     PARAMETERS.
 
IF YOU HAVE ANY QUESTIONS...PLEASE CONTACT: 

     HENDRIK L. TOLMAN
     CHIEF...MARINE MODELING BRANCH
     NCEP/EMC
     PHONE: 301-763-8000 X7253
     EMAIL: HENDRIK.TOLMAN@NOAA.GOV

THIS NOTICE AND OTHER TECHNICAL IMPLEMENTATION NOTICES ARE 
AVAILABLE ONLINE AT /USE LOWER CASE LETTERS/: 

     HTTP://WWW.NWS.NOAA.GOV/OM/NOTIF.HTM

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