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## === retrieve EFAS Seasonal Forecast ===
 
## === subset Switzerland region ===
 
import cdsapi
 
 
if __name__ == '__main__':
    c = cdsapi.Client()
 
    YEARS  = ['%d'%(y) for y in range(2020,2022)]
 
 
    MONTHS = ['%02d'%(m) for m in range(1,13)]
 
    LEADTIMES = ['%d'%(l) for l in range(24,5160,24)]
     
    for year in YEARS:
 
        for month in MONTHS:
             
            c.retrieve(
                'efas-seasonal',
                {  
                'variable': 'river_discharge_in_the_last_24_hours',
                'format': 'grib',
                'model_levels': 'surface_level',
                'year': year,
                'month': '12' if year == '2020' else month,
                'leadtime_hour': LEADTIMES,
                'area': [ 47.59, 5.58, 45.07, 10.56 ]
 
                },
                f'efas_seasonal_{year}_{month}.grib')