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Info

The objective of this example is to demonstrate how you can write a request efficiently by iterating properly over several hindcastYears, hindcastMonths and hindcastDays
It can be used as a starting point however you need to adapt it to your needseg to set the keyword values according to your requirements (eg hindcastYear).
In this way you can extend this request to download the whole S2S CMA reforecast. Don't forget to check CMA availability

Please note: use the variable "target" to write each hindcastDate on a separate file .

By taking under consideration your request's size (eg nr of fields and volume) you can merge several hindcastDates on the same "target"

Code Block

language	py

#!/usr/bin/env python
import calendar
from ecmwfapi import ECMWFDataServer
server = ECMWFDataServer()

hindcastYearStart = 1994
hindcastYearEnd = 2014
hindcastMonthStart = 1
hindcastMonthEnd = 12

def retrieve_cma_reforecast():
    for hindcastYear in list(range(hindcastYearStart, hindcastYearEnd + 1)):
        for hindcastMonth in list(range(hindcastMonthStart, hindcastMonthEnd + 1)):
            numberOfDays = calendar.monthrange(hindcastYear, hindcastMonth)[1]
            for hindcastDay in list(range(1, numberOfDays + 1)):
                hindcastDate = '%04d%02d%02d' % (
                    hindcastYear, hindcastMonth, hindcastDay)
                cma_reforecast_request(hindcastDate)

def cma_reforecast_request(hindcastDate):
    origin = "babj"
    modelVersionDate = "2014-05-01"
    target = "target_s2s_%s_%s.grb" % (origin, hindcastDate)
    server.retrieve({
        "class": "s2",
        "dataset": "s2s",
        "date": modelVersionDate,
        "expver": "prod",
        "hdate": hindcastDate,
        "levtype": "sfc",
        "origin": origin,
        "param": "165",
        "step": "0",
        "stream": "enfh",
        "target": target,
        "time": "00",
        "type": "cf",
    })

if __name__ == '__main__':
    retrieve_cma_reforecast()

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