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The objective of this example is to demonstrate how to iterate efficiently over some dates (eg '2014-10-01' and '2014-11-01') a request for 'perturbed forecast', 'pressure' and 'sfc' level, for TIGGE, ECMWF Center,.
It can be used as a starting point, however you need to keep in mind that you have to adapt it to your needseg to set the keyword values according to your requirements ('param', 'levtype', 'step' etc).
In this way you can extend this request to download the whole a longer period of TIGGE.

Keep in mind that the most efficient way is to organise your requests per dates and times

ie select a set of dates and times and add, the 'steps', 'origins', 'levels' and 'parameters' that you need.

It is not efficient to organise your requests per parameter, per origin or or per step. (eg to submit a different request per parameter for a set list of datedates)

Code Block

language	py

#!/usr/bin/env python
from ecmwfapi import ECMWFDataServer
server = ECMWFDataServer()
   
def retrieve_tigge_data():
    dates = ['2014-10-01', '2014-11-01']
    times = ['00', '12']
    for date in dates:
         for time in times:
             target = 'ecmwf_sfc_%s_%s.grb' % (date, time)
             tigge_pf_sfc_request(date, time, target)
             target = 'ecmwf_pl_%s_%s.grb' % (date, time)
             tigge_pf_pl_request(date, time, target)

def tigge_pf_pl_request(date, time, target):
    '''
       A TIGGE request for perturbed forecast, pressure level, ECMWF Center.
       Please note that a subset of the available data is requested below.
       The cost of this request is xxx fields and xxx GB
       Change the keywords below to adapt it to your needs. (ie to add more parameters, or numbers etc)
    '''
    server.retrieve({
        'class': 'ti',
        'dataset': 'tigge',
        'date': date,
        'expver': 'prod',
        'grid': '0.5/0.5',
        'levelist': '200/250/300/500/',
        'levtype': 'pl',
        'number': '1/TO/10',
        'origin': 'ecmf',
        'param': '130/131/132/133',
        'step': '0/TO/96/BY/12',
        'target': target,
        'time': time,
        'type': 'pf',
    })

def tigge_pf_sfc_request(date, time, target):
    '''
       A TIGGE request for perturbed forecast, sfc, ECMWF Center.
       Please note that a subset of the available data is requested below.
       The cost of this request is xxx fields and xxx GB
       Change the keywords below to adapt it to your needs. (ie to add more parameters, or numbers etc)
    '''
    server.retrieve({
         'class': 'ti',
         'dataset': 'tigge',
         'date': date,
         'expver': 'prod',
         'grid': '0.5/0.5',
         'levtype': 'sfc',
         'number': '1/TO/10',
         'origin': 'ecmf',
         'param': '146/147/151/165/166/167/168/176/177',
         'step': '0/TO/96/BY/12',
         'target': target,
         'time': time,
         'type': 'pf',
       })

if __name__ == '__main__':
    retrieve_tigge_data()

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