NOUS41 KWBC 121325



Technical Implementation Notice 16-22

National Weather Service Headquarters Washington DC

125 PM EDT Tue Jul 12 2016


To:      Subscribers:

         -NOAA Weather Wire Service

         -Emergency Managers Weather Information Network


         Other NWS Partners and NWS Employees


From:    Tim McClung

         Portfolio Manager

         Office of Science and Technology Integration


Subject: The Nearshore Wave Prediction System (NWPS) data will

         be provided over the Satellite Broadcast Network (SBN)

         and NOAAPORT on or about October 25, 2016, for Western,

         Pacific and Alaska Region WFOs.


Effective on or about Tuesday, October 25, 2016, NWPS data will

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

day, on-demand, depending on the coastal Weather Forecast Office

(WFO). On or about October 25, 2016, data for 13 additional

coastal WFO domains (Western, Pacific and Alaska Regions) will

be available. This addition will append the data from the 

23 Eastern and Southern Region WFOs implemented in February

2016, bringing the total to 36 coastal WFO domains. 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 are:


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

O - 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 coastal WFO. The average

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

day, for each of the remaining 13 coastal WFO domains.


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



Each WFO may produce up to 5 grids. Not all WFOs are producing

all 5 grids for their County Warning Area (CWA).


CG0 grid messages are approximately 8 MB per WFO. The total

volume (13 coastal WFOs) is 104 MB per cycle, 2 times per day.


CG1 grid messages are approximately 29 MB per WFO. The total

volume is 377 MB per cycle, 2 times per day.


CG2 grid messages are approximately 7 MB per WFO. The total

volume is 91 MB per cycle, 2 times per day.


CG3 grid messages are approximately 7 MB per WFO. The total

volume is 91 MB per cycle, 2 times per day.


CG4 grid messages are approximately 7 MB per WFO. The total

volume is 91 MB per cycle, 2 times per day.


CG5 grid messages are 7 MB per WFO. The total volume is 91 MB

per cycle, 2 times per day.


The total volume (13 coastal WFOs) for all resolution files is

approximately 845 MB 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, Q=96, 99, 102


ii = 88 (specifies surface)


CCCC corresponds to K, appended by the 3-letter AWIPS code

for the generating the 13 coastal WFO domains:



SEW - Seattle, Washington

PQR - Portland, Oregon

MFR - Medford, Oregon

EKA - Eureka, California

MTR - Monterey, California

LOX - Los Angeles, California

SGX - San Diego, California

HFO - Honolulu, Hawaii

GUM - Tiyan, Guam

AJK - Juneau, Alaska

AER - Anchorage, Alaska

ALU - Anchorage (Aleutian Islands), Alaska

AFG - Fairbanks, Alaska





In addition to NOAAPORT, data will be available through the NCEP

ftp/http services:


On Implementation day there will be directory changes for the



  /pub/data/nccf/nonoperational/com/nwps/para/  -->



Parallel data will be available at the following location from

September 8, 2016:




The file format is the following:


For each of the 2-character regional codes (sr, er, wr, pr, ar)

the GRIB2 files are listed under date (YYYYMMDD), 3-character

WFO code (listed above, in lower case), run cycle (CC) and model

domain (CG = CG1, CG2, CG3, CG4, CG5; or CG0). The run cycle

always corresponds to the analysis time of the run (HH). All

output variables pertaining to the run domain are stored in a

single GRIB2 file. Note that since the runs are on demand, not

all CC cycles will be produced during a given YYYYMMDD.







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 STI Modeling Lead

NOAA/NWS/Office of Science and Technology Integration

Silver Spring, MD 20910


For questions regarding the model, please contact:


Hendrik L. Tolman

NCEP/Director, Environmental Modeling Center

College Park, MD 20746



For questions regarding data flow aspects, please contact:


Carissa Klemmer

NCEP/NCO Dataflow Team

College Park, MD 20746



National Technical Implementation Notices are online at: