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Keyworddefinition
dataset See Available Datasets
Date & Time
time

Base time (00, 06, 12 and 18)

Observation time (HHMM or HH:MM: ie 09:30)

date

Specifies the Analysis date, the Forecast base date or Observations date. Formats

  • Absolute as YYYY-MM-DD, YYYYMMDD. The day of the year can also be used: YYYY-DDD
  • Relative as -n ; n is the number of days before today (i.e., -1 = yesterday )
  • Name of month (e.g. january for Climatology data)
  • Operational monthly means are retrieved by setting day (DD) to 00.
stepSpecifies the forecast time step from forecast base time. Valid values are hours (HH)
Fields
type

Determines the type of field to be retrieved:

This keyword makes the selection between observations, images or fields, and it determines some of the valid remaining keywords of the request.
  • Analysis (an)
  • Forecast (fc)
  • Perturbed Forecast (pf)
  • Control Forecast (cf)
levtype

Denotes type of level:

  • Model level (ml)
  • Pressure level (pl)
  • Surface (sfc)
  • Potential vorticity (pv)
  • Potential temperature (pt)
  • Depth (dp)
param

Meteorological parameter. (t, temprerature, 130, 30.128, ...)

grid

Output grid mesh

  • Latitude/longitude increments in degrees (2.5/2.5)
  • Number of latitude lines from Pole to Equator (160)
Storage
formatYou can add format = "netcdf" to retrieve the data in NetCDF format.
target
specifies a Unix file into which data is to be written after retrieval or manipulation. Path names should always be enclosed in double quotes:
target = "analysis.grb"