This is a prequel to the previous post on Extracting point forecasts from TIGGE-LAM grib archives.
How do you get access to the TIGGE-LAM data, and once you do have access, how do you know which data to download?
The following is a short guide:
- Register as a user with ECMWF. Visit https://www.ecmwf.int/, click on login, then on ‘Register’.
- Your registration may take a day or two to be approved.
- Login, then visit the TIGGE-LAM data portal
- Read the important notice on the MARS server’s efficiency before attempting to download data: https://screenshots.firefox.com/1T73Hh78xsuAYpNw/apps.ecmwf.int
- Assuming you just want a point forecast and not a whole ensemble, select ‘prod‘ (production) as the version, select ‘control forecast‘
- Select the time period (months and years) you are interested in.
- Select the model from the TIGGE-LAM family whose output you wish to download. We used HIRLAM from the Danish Meteorological Institute because of its relatively high update frequency (every six hours).
- Select the parameters of interest, e.g. 10 m u and v components of wind speed.
- Submit the request
- It may take several hours or even days for the request to be processed.
- Check your job’s progress on http://apps.ecmwf.int/webmars/joblist/
The ECMWF data portal also offers you a choice of output format. In the previous post on TIGGE-LAM I described how to deal with the default rotated lat/lon grid. However, other output format options are offered which may be more useful for your particular application.