Input forecast (METRo)

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This article describe the atmospheric forecast input file of METRo.

Description Edit

This file contains the atmospheric forecast needed to METRo to perform a roadcast.

Version and revision date Edit

  • Version: 1.2
  • Revision date: March 17th 2008

Default location Edit

No default location. Atmospheric forecast file must be specified on command line.

Contents Edit

This file contains the name of the station (region or location) for which this forecast has been emitted, the forecast emission date and time, the time zone of this station and the needed weather elements.

The forecast must be at every 60 minutes following the first forecast time. Forecast must have at least 2 forecast time.

Mandatory fields Edit

Header Edit

Field description Element name
Version number version
Date of creation production-date

Forecast Edit

Field description Element name Unit
Date and time of forecasted elements forecast-time ISO 8601
Air temperature (1.5 m) at Celsius
Dew point (1.5 m) td Celsius
Rain precipitation quantity since the beginning of the forecast ra mm
Snow precipitation quantity since the beginning of the forecast sn cm
Wind speed (10 m) ws km/h
Surface pressure (at the station height) ap mb
Octal cloud coverage (0-8) cc octal

Optional fields Edit

Solar/Infra-red flux Edit

Field description Element name Unit
Solar flux sf W/m²
Infra-red ir W/m²

The solar and infra-red flux can be used by adding the options --use-solarflux-forecast and --use-infrared-forecast, respectively, in the command line.

Both fields are the incident fluxes (coming from the sky down to Earth), not the net flux. Other details about fluxes should be found in METRo article. For data illustration, you can run METRo using values of cc and then observe sf and ir parameters in the roadcast output file.

If both --use-solarflux-forecast and --use-infrared-forecast are used, the cc field is not mandatory.

The flux in the heat balance of METRo are used directly instead of being derivate from the octal cloud cover. In the case that both infrared and solar flux are given in the forecast file, the cloud cover is not used but must be in the forecast file anyway.

This option is available from METRo version 3.2.0 and later.

Anthropogenic flux Edit

Field description Element name Unit
Anthropogenic flux fa W/m²

The anthropogenic flux can be used by adding the options --use-anthropogenic-flux in the command line. This field is optional and if it is not specified, the default value 10 W/m² will be used.

Influence of the vehicles, near buildings, cities, etc. can be included through this parameter.

This option is available from METRo version 3.2.7 and later.

Data source Edit

World Edit

The output of the canadian Global Environmental Model (GEM) can be used as input for atmospheric forecast. This data covers the Earth and are freely available in the GRIB format from the website of Environment Canada.

Canada Edit

Environment Canada is providing an hourly atmospheric forecast for all the Canada for free in an XML format called Canadian Meteorological Markup Language (CMML). Data can be downloaded at the following URL:

Example Edit

<?xml version="1.0"?> 

METRo I/O files
Station | Observation | Forecast | Roadcast | Configuration
METRo I/O specification
Schema | | Flowchart | Format | Date | Observation QA/QC | Road condition | Station type | Time zone | Layer type | Latitude and longitude
METRo I/O examples
Station | Observation | Forecast | Roadcast | Graphical display

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This page is part of the documentation of the METRo software. Back to the table of content.

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