NOUS41 KWBC 121354 AAA



Technical Implementation Notice 15-01 Amended

National Weather Service Headquarters Washington DC

955 AM EDT Thu Mar 12 2015


To:      Subscribers:

         -Family of Services

         -NOAA Weather Wire Service

         -Emergency Managers Weather Information Network


         Other NWS Partners and NWS Employees


From:    Tim McClung

         Chief, NWS Science Plans Branch

         Office of Science and Technology


Subject: Amended: The Nearshore Wave Prediction System (NWPS)

         data will be provided over the Satellite Broadcast

         Network (SBN) and NOAAPORT on or about September 1, 2015

         for WFOs MFL and BOX and to the remaining Eastern and

         Southern Region WFOs by September 30, 2015.


Amended data activation date to September 1, 2015, for WFOs MFL

and BOX and for the remaining ER and SR WFOs by September 30,



Effective on or about Tuesday, September 1, 2015, NWPS data will

be added to the SBN and NOAAPORT. The NWPS is run 2-4 times per

day or on demand, depending on the coastal Weather Forecast

Office (WFO). There are 37 coastal WFOs. Initially, the NWPS will

be available to WFOs MFL and BOX and then to the 22 coastal

Eastern and Southern Region WFOs over the month of September

2015. Over the next 1-2 years, data for the remaining coastal

WFOs will be available. The 3-hourly grids will be disseminated

in GRIB2 format. Grid resolutions will be dependent upon

individual coastal WFO.


The parameters associated with the messages at these resolutions



Q - Wind Speed

R - Wind Direction

Z - Current speed

Z - Current direction

Z - Water level

C - Wave Height

D - Water Depth

J - Peak Frequency/Period

K - Peak Direction

Z - Wave Length

Z - Wave height of swell waves

O - Partitioned swell wave height

Y - Partitioned swell peak period

P - Partitioned swell mean direction


Data volume will vary depending on the coastal WFO. The average

total data volume is approximately 65 MB per cycle, 2 times per

day, for each of the 22 coastal WFOs.


CG grids are described as follows:

CG0 grid - partition output on overall computational domain (low-

resolution), for a given WFO

CG1 grid - integral output on overall computational grid, for a

given WFO

CG2 grid - integral output on first nested grid, where applicable

CG3 grid - integral output on second nested grid, where


CG4 grid - integral output on third nested grid, where applicable

CG5 grid - integral output on fourth nested grid, where



The sizes of the CG0 grid messages are approximately 8 MB per

WFO. The total volume (22 coastal WFOs) is 176 MB per cycle,

2 times per day.


The sizes of the CG1 grid messages are approximately 29 MB per

WFO. The total volume is 638 MB per cycle, 2 times per day.


The sizes of the CG2 grid messages are approximately 24 MB per

WFO. The total volume is 528 MB per cycle, 2 times per day.


The sizes of the CG3 grid messages are approximately 3 MB per

WFO. The total volume is 66 MB per cycle, 2 times per day.


The sizes of the CG4 grid messages are approximately 1 MB per

WFO. The total volume is 22 per cycle, 2 times per day.


The sizes of the CG5 grid messages are 3 MB per WFO. The total

volume is 66 MB per cycle, 2 times per day.


The total volume (22 coastal WFOs) for all resolution files is

approximately 1.5 GB per cycle, 2 times per day.



The following summarizes the generic WMO Headers for the NWPS

data: T1T2A1A2iiCCCC, where

T1 = E

T2 specifies the parameters (stated above)

A1 = A for CG0 grid; B for CG1 grid; C for CG2 grid; D for CG3

grid; E for CG4 grid, and F for CG5 grid

A2 specifies forecast hours: A = 00, B=03, C=06, D=09, E=12,

F=15, G=18, H=21, I=24 and 27, J=30 and 33, K= 36 and 39, L = 42

and 45, M=48 and 51, X= 54 and 57, N=60 and 63, Y=66 and 69, O =

72, 75, 78 and 81, P=84, 87, 90 and 93, and Q=96

ii = 88 (specifies surface)

CCCC corresponds to K, appended by the three-letter AWIPS code

for the generating 22 coastal WFOs:


BRO - Brownsville, Texas

CRP - Corpus Christi, Texas

HGX - Houston/Galveston, Texas

LCH - Lake Charles, Louisiana

LIX - New Orleans/Baton Rouge, Louisiana

MOB - Mobile/Pensacola, Alabama/Florida

TAE - Tallahassee, Florida

TBW - Tampa Bay, Florida

MFL - Miami-South Florida, Florida

KEY - Key West, Florida

MLB - Melbourne, Florida

JAX - Jacksonville, Florida

SJU - San Juan, Puerto Rico

CAR - Caribou, Maine

GYX - Gray/Maine, Maine

BOX - Boston, Massachusetts

NYC - New York, New York

PHI - Mt. Holly, New Jersey

LWX - Baltimore/Washington, Maryland/Virginia

AKQ - Wakefield, Virginia

MHX - Morehead City, North Carolina

ILM - Wilmington, North Carolina

CHS - Charleston, South Carolina


The NWPS website is located at:


For additional information regarding GRIB2 files, visit:


For questions pertaining to NWPS data, please contact:


Nicole P. Kurkowski

NWS OST Marine Program Manager

NOAA/NWS/OST/PPD Science Plans Branch

Silver Spring, MD 20910


National Technical Implementation Notices are online at: