Download and display weather data contained in GRIB1 files.

Weather data display:
    - atmospheric pressure at sea level
    - wind at 10m above ground
    - temperature at 2m above ground (degC)
    - relative humidity at 2m above ground
    - rainfall (mm/h)
    - cloud cover (%)
    - dew point (degC)
    - altitude of 0C isotherm
    - snow depth and risk