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Every six hours a numerical
forecast model shows the changing weather, by quarters of an
hour for up to 3 or 7 days. It provides forecast maps for Europe
at various altitudes at 3, 6 or 9 hour intervals.
This very complex model with millions of pieces of information
requires very powerful computers ; supercomputers capable of
billions of operations a second.
The forecasting maps are
interpreted by the forecaster, who adapts and refines them until
they are as accurate as possible for his area of competence.
This interpretive work remains indispensable for achieving bulletins
of a high standard. In fact, the forecasts on the model are
often approximate, barely taking local phenomena into account
(storms, banks of fog, wind acceleration in valleys…).
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