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retrieve,
class=ti,
date=2024-02-01/to/2024-02-03,
expver=prod,
grid=0.5/0.5,
levtype=sfc,
origin=ecmf,
param=121/122,
step=6/to/24/by/6,
time=00:00:00,
type=cf,
target="output"

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

server.retrieve({
    "dataset": "tigge",
    "date": "2024-02-01/to/2024-02-03",
    "expver": "prod",
    "grid": "0.5/0.5",
    "levtype": "sfc",
    "origin": "ecmf",
    "param": "121/122",
    "step": "6/to/24/by/6",
    "time": "00:00:00",
    "type": "cf",
    "target": "output"
})

#!/usr/bin/env python
import cdsapi
client = cdsapi.Client()
            
dataset = "tigge-forecasts"

request = {
    "class": "ti",
    "date": "2024-02-01/2024-02-03",
    "expver": "prod",
    "grid": "0.5/0.5",
    "levtype": "sfc",
    "origin": "ecmf",
    "param": "121/122",
    "step": "6/to/24/by/6",
    "time": "00:00:00",
    "type": "cf"
}


target = "output"
client.retrieve(dataset, request, target)

#!/usr/bin/env python
import cdsapi
client = cdsapi.Client()

dataset = "tigge-forecasts"

request = {
    "year": ["2024"],
    "month": ["02"],
    "day": ["01", "02", "03"],
    "grid": "0.5/0.5",
    "level_type": "single_level",
    "origin": "ecmf",
    "variable": ["maximum_2m_temperature_last_6_hours",
       "minimum_2m_temperature_last_6_hours"],
    "leadtime_hour": "6/to/36024/by/6",
    "time": "00:00:00",
    "forecast_type": "control_forecast",
    "data_format": "grib"
}

target = "output"
client.retrieve(dataset, request, target)

Direct access to MARS database needed

(not publicly available)

--> cat $HOME/.cdsapirc
url: https://ecds.ecmwf.int/api
key: <personal token>

client = cdsapi.Client(url="https://ecds.ecmwf.int/api", 
key="<personal token>")