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The ECMWF
forecast products can be used at different levels of complexity,
from categorical, single-value forecasts to probabilistic,
multi-value forecasts. They can be used as guidance to forecasters
but also to provide direct input to elaborate decision-making
systems. The choice largely depends on the traditions, demands and
constraints of the particular meteorological service. The
emphasis here will be on a combined use of the probabilistic EPS
and deterministic NWP. The
use of ECMWF products for categorical and probabilistic forecasting
will be discussed both when no EPS material is available and when
the full range of EPS material is available, with or without the
deterministic forecasts.
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