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TECHNICAL IMPLEMENTATION NOTICE 08-62  
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
100 PM EDT WED AUG 6 2008

TO:       SUBSCRIBERS:
          -FAMILY OF SERVICES
          -NOAA WEATHER WIRE SERVICE
          -EMERGENCY MANAGERS WEATHER INFORMATION NETWORK
          OTHER NWS PARTNERS...USERS AND EMPLOYEES

FROM:     JASON TUELL
          CHIEF...SCIENCE PLANS BRANCH
          OFFICE OF SCIENCE AND TECHNOLOGY

SUBJECT:  ADDITION OF GREAT LAKES WAVE MODEL GRIDS TO NOAAPORT:     
          EFFECTIVE OCTOBER 21 2008
           
EFFECTIVE TUESDAY OCTOBER 21 2008...WITH THE 1200 COORDINATED 
UNIVERSAL TIME /UTC/ RUN... THE NATIONAL CENTERS FOR 
ENVIRONMENTAL PREDICTION /NCEP/ WILL ADD A NEW WAVE MODEL FOR THE 
GREAT LAKES TO NOAAPORT. THE GREAT LAKES WAVE MODEL WILL BE BASED 
IN PART ON THE NATIONAL DIGITAL FORECAST DATABASE /NDFD/ WINDS 
AND TEMPERATURES. THIS MODEL IS REFERRED TO AS THE GLWN  
/N INDICATES THE USE OF NDFD WINDS AND TEMPERATURES/. 

GLWN WILL USE THE THIRD GENERATION WIND WAVE MODEL WAVEWATCH III 
CURRENTLY USED TO DRIVE THE MULTI GRID GLOBAL WAVE FORECAST 
MODEL. THE GLWN WILL CONSIST OF A SINGLE GRID FOR THE GREAT LAKES 
AT A RESOLUTION OF 3 MINUTES IN LONGITUDE AND 2.1 MINUTES IN 
LATITUDE.

THE GLWN WILL USE THREE HOURLY FORECASTED TEMPERATURES...WIND 
SPEEDS AND DIRECTIONS OUT TO 144 HOURS PRODUCED BY THE WEATHER 
FORECAST OFFICES /WFO/ IN THE GREAT LAKES.

A PARTITIONING ALGORITHM IS USED TO PROPERLY PARTITION THE ENERGY 
SPECTRA. FIELD OUTPUT WILL BE PROVIDED IN GRIB2 FORMAT ON A 
HOURLY TEMPORAL RESOLUTION OUT TO 144 HOURS AND WILL INCLUDE THE 
FOLLOWING FIELDS:

    1.	WIND SPEED AND DIRECTION
    2.	WIND VELOCITY /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 WIND WAVE COMPONENT...A PRIMARY SWELL 
        COMPONENT AND A SECONDARY SWELL COMPONENT. MORE 
        PARTITIONED FIELD COMPONENTS CAN BE ADDED TO THE OUTPUT 
        PARAMETERS.

GLWN WILL RUN AT 02...08...14...20 UTC EXCEPT DURING DAYLIGHT 
SAVING TIME 01...07...13...19 UTC. NOAAPORT DELIVERY TIMING WILL 
BE APPROXIMATELY 30 MINUTES AFTER THE MODEL RUN TIME.

DATA VOLUME FOR EACH MODEL RUN WILL BE APPROXIMATELY 44 MEGABYTES 
/MB/ OR APPROXIMATELY 176 MB PER DAY.

THE WMO HEADINGS FOR THESE PRODUCTS WILL IN THE FOLLOWING FORM:

    T1:  DATA FORMAT OF GRIB2 /E/
    T2:  PARAMETER CODE /ONE OF ABCJKLMNOPQRY/
    A1:  GRID CODE /I/
    A2:  FORECAST TIME /ONE OF ABCDEFGHIJKLMNOPQRST/
    II:  LAYER OR LEVEL /88/
  CCCC:  KWBJ

A COMPLETE DESCRIPTION AND LIST OF WMO HEADINGS IS ONLINE AT:

  HTTP://WWW.WEATHER.GOV/OS/NOTIFICATION/RESOURCES/GLWN.PDF
 
FOR QUESTIONS RELATED TO THE MODEL...PLEASE CONTACT: 

  HENDRIK TOLMAN
  NCEP/EMC...CHIEF MARINE MODELING BRANCH
  CAMP SPRINGS MARYLAND
  PHONE: 301 763 8000 X7253
  EMAIL: HENDRIK.TOLMAN@NOAA.GOV
OR
  JOHN F. KUHN
  NWS OFFICE OF SCIENCE AND TECHNOLOGY
  SILVER SPRING MARYLAND
  PHONE: 301 713 3557 X184  
  EMAIL: JOHN.F.KUHN@NOAA.GOV
         
FOR QUESTIONS ABOUT NOAAPORT ACTIVATION...PLEASE CONTACT:

  DAVE NIVER
  NWS OFFICE OF SCIENCE AND TECHNOLOGY
  SILVER SPRING MARYLAND
  PHONE: 301 713 0211 X180  
  EMAIL: DAVE.NIVER@NOAA.GOV

NWS TECHNICAL IMPLEMENTATION NOTICES ARE ONLINE AT: 

  HTTP://WWW.WEATHER.GOV/OS/NOTIF.HTM

$$
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