NOUS41 KWBC 252052

PNSWSH

 

Technical Implementation Notice 15-02

National Weather Service Headquarters Washington DC

355 PM EST Wed Jan 28 2015

 

To:      Subscribers:

         -Family of Services

         -NOAA Weather Wire Service

         -Emergency Managers Weather Information Network

         -NOAAPORT

         Other NWS Partners and NWS Employees

 

From:    Tim McClung

         Chief, NWS Science Plans Branch

         Office of Science and Technology

 

Subject: Updated NDFD-forced late run (GLWN) of the Great Lakes

         Wave Model system (GLW) model grid data will be provided

         over the Satellite Broadcast Network (SBN) and NOAAPORT

         effective April 28, 2015

 

Effective on or around Tuesday, April 28, 2015, updated GLWN

model grid data will be added to the SBN and NOAAPORT. The wave

model grids are being upgraded from a regular rectilinear 4 km

mesh to a 2.5 km Lambert Conformal grid. The hourly grids will be

disseminated in GRIB2 format.

 

The GRIB2 files contain 16 wave model parameters:

WIND Wind Speed

WDIR Wind Direction

U GRD U-wind component

V GRD V-wind component

HTSGW Total significant wave height

PERPW Period of Spectral Peak of the Ocean Waves

DIRPW Direction of Spectral Peak of the Ocean Waves

WVHGT Height of significant Wind Waves

WVPER Mean Period of Wind Waves

WVDIR Mean Direction of Wind Waves

SWELL Height of significant Swell Waves, Order Seq. Of Data 1

SWELL Height of significant Swell Waves, Order Seq. Of Data 2

SWDIR Mean Direction of Swell Waves, Order Seq. Of Data 1

SWDIR Mean Direction of Swell Waves, Order Seq. Of Data 2

SWPER Mean Period of Swell Waves, Order Seq. Of Data 1

SWPER Mean Period of Swell Waves, Order Seq. Of Data 2

 

The GLW model runs at 03z, 09z, 15z and 21z.

 

The average total data volume will be approximately 480 MB per

day, with 120 MB per four cycles.

 

The WMO Headers for these products are:

EQKA88 KWBJ

ERKA88 KWBJ

EAKA88 KWBJ

EBKA88 KWBJ

ECKA88 KWBJ

EJKA88 KWBJ

EKKA88 KWBJ

ELKA88 KWBJ

EMKA88 KWBJ

ENKA88 KWBJ

EOKA88 KWBJ

EOKA88 KWBJ

EPKA88 KWBJ

EPKA88 KWBJ

EYKA88 KWBJ

EYKA88 KWBJ

 

WMO Header template will follow:  T1 T2 A1 A2 ii cccc

  T1 = E

  T2 specifies parameter as follows:

      Q - Wind Speed

      R - Wind Direction

      A - U-Wind component

      B - V-Wind component

      C - Total Significant wave height

      J - Period of Spectral Peak of the Ocean Waves

      K - Direction of Spectral Peak of the Ocean Waves

      L - Height of significant Wind Waves

      M - Mean Period of Wind Waves

      N - Mean Direction of Wind Waves

      O - Height of significant Swell Waves

      P - Mean Direction of Swell Waves

      Y - Mean Period of Swell Waves

  A1 = K (Lambert Conformal - Great Lake Wave Model 2.5 km grid)

  A2 specifies the forecast hour as follows: A=00; B=01,02,03;

C=04,05,06; D=07,08,09; E=10,11,12; F=13,14,15; G=16,17,18;

H=19,20,21,22,23; I=24,25,26,27,28,29; J=30,31,32,33,34,35;

K=36,37,38,39,40,41; L=42,43,44,45,46,47;

M=48,49,50,51,52,53,54,55,56,57,58,59;

N=60,61,62,63,64,65,66,67,68,69,70,71;  O=72,73,74,75,76,77,78,79

,80,81,82,83; P=84,85,86,87,88,89,90,91,92,93,94,95;

Q=96,97,98,99,100,101,102,103,104,105,106,107,108,109,110,111,112

,113,114,115,116,117,118,119;

R=120,121,122,123,124,125,126,127,128,129,130,131;

S=132,133,134,145,136,137,138,139,140,141,142,143;

T=144,145*,146*,147*

      *indicates new forecast hours

  ii = 88  (Land/Water properties at the surface of earth or

Ocean)

  cccc is KWBJ

 

 

Sample GLWN products will be available at:

 

ftp.ncep.noaa.gov/pub/data1/nccf/com/glw

 

Details about the NCEP Wave Models are found online at:

 

http://polar.ncep.noaa.gov/waves/index2.shtml

 

For additional information regarding GRIB2 files, visit:

 

http://www.nco.ncep.noaa.gov/pmb/docs/grib2/

 

For questions pertaining to GLWN data, please contact:

 

Nicole P. Kurkowski

NWS OST Marine Program Manager

NOAA/NWS/OST/PPD Science Plans Branch

Silver Spring, MD 20910

nicole.kurkowski@noaa.gov

 

National TINs are online at:

 

http://www.weather.gov/os/notif.htm

 

$$