GRIB2 - CODE TABLE 4.6

TYPE OF ENSEMBLE FORECAST

In Section 4, Octet 35 - for product templates 1 and 11

Revised 09/18/2025
Red text depicts changes made since 09/18/2025



Code Figure Meaning
0
Unperturbed High-Resolution Control Forecast
1
Unperturbed Low-Resolution Control Forecast
2
Negatively Perturbed Forecast
3
Positively Perturbed Forecast
4 Multi-Model Forecast
5 Unperturbed Forecast
6 Perturbed Forecast
7 Initial Conditions Perturbations (see Note 1)
8 Model Physics Perturbations (see Note 2)
9 Initial Conditions and Model Physics Perturbations (see Note 3)
10-191
Reserved
192-254
Reserved for Local Use
192 Perturbed Ensemble Member
255 Missing


Notes:

(1)  Ensemble members are initialized from different initial conditions.

(2)  Model physics are perturbed (for example, with methods like SPPT, SPP and SKEB.

(3)  Combination of 7 and 8.


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