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Global Ensemble Wave Prediction System (GEWPS) data in GRIB2 format

This page describes the experimental Global Ensemble Wave Prediction System data available in GRIB2 format.

Data location

MSC testing data repository DD-Alpha data can be automatically retrieved with the Advanced Message Queuing Protocol (AMQP) as soon as they become available. An overview and examples to access and use the Meteorological Service of Canada's open data is also available.

The data is available via the HTTP protocol. It is possible to access it with a standard browser. In this case, we obtain a list of links giving access to a GRIB2 file.

The experimental data can be accessed at the following URL :

where :

  • HH : Model run start, in UTC [00 or 12]

A history of 24 hours is maintained in this directory.

Available Domain

Global latitude-longitude grid.

Parameter Value
ni 1440
nj 721
resolution 0.25°
coordinate of first grid point 90° S 0° E

File name nomenclature

NOTE: ALL HOURS ARE IN UTC.

File names have the form:

{YYYYMMDD}T{HH}Z_MSC_GEWPS_VAR_LVL_{grille}{resolution}_PT{hhh}H.grib2

Where:

  • YYYYMMDD: Year, month and day of the beginning of the forecast
  • T : Time delimiter according to ISO8601 norms
  • HH: UTC run time [00, 12]
  • Z : Time zone (UTC hour)
  • MSC : Constant string indicating the Meteorological Service of Canada, source of data
  • GEWPS : Constant string indicating that data is from the Global Ensemble Wave Prediction System
  • VAR : Variables included in the file
  • LVL : Vertical level [SFC for the surface]
  • grille : Horizontal grid type [LatLon]
  • resolution : Indicating resolution in degreee in latitude and longitude directions [0.25x0.25]
  • PT{hhh}H: Forecast hours based on ISO8601 norms. P, T and H are constant character designating Period, Time and Hour. "hhh" is the forecast hour [000, 003, 006, ..., 384]
  • grib2: constant string indicating the GRIB2 format is used

Example of file name:

20210225T12Z_MSC_GEWPS_HTSGW_SFC_LatLon0.25x0.25_PT015H.grib2

Variable List

This table provides, for each GRIB2 parameter number: a short description, an alphabetical abbreviation, the levels available for the parameter, and measurement units.

GRIB2 discipline/category/parameter number Parameter description Abbreviation Level Units
10/0/3 Significant height of combined wind waves and swell HTSGW SFC m
10/0/34 Peak wave period PWPER SFC s
10/0/28 Mean zero-crossing wave period MZWPER SFC s
10/0/46 Peak wave direction PWAVEDIR SFC degrees true
10/0/4 Direction of wind waves WVDIR SFC degrees true
10/0/5 Significant height of wind waves WVHGT SFC m
10/0/35 Peak period of wind waves PPERWW SFC s
10/0/53 Mean wave direction of first swell partition MWDFSWEL SFC degrees true
10/0/47 Significant wave height of first swell partition SWHFSWEL SFC m
10/0/65 Peak wave period of first swell partition PWPFSWEL SFC s
10/0/54 Mean wave direction of second swell partition MWDSSWEL SFC degrees true
10/0/48 Significant wave height of second swell partition SWHSSWEL SFC m
10/0/66 Peak wave period of second swell partition PWPSSWEL SFC s

Support

If you have any questions about this data, please contact us at : ec.dps-client.ec@canada.ca

Announcements from the dd_info mailing list

Announcements related to this dataset are available in the dd_info list.