The HRES stream = scda  time 06z and 18z is available from the following:

  • Forecast

    Mars request example 
    retrieve,
class=od,
date=2018-10-30,<-- your date
expver=1,
levtype=sfc,
param=10U/10V, <-- your parameters
step=0/to/90/by/1,
stream=scda,
time=06/12,
type=fc,
target="output"

  • Analysis

    Mars request example 
    retrieve,
class=od,
date=2018-10-30,<-- your date
expver=1,
levtype=sfc,
param=10U/10V, <-- your parameters
step=0,
stream=scda,
time=06/12,
type=an,
target="output"

The ENS high frequency (stream= enfo time = 06/18) is available, as the other time 00z and 12z, from the following: