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- most commonly as absolute values:
- instantaneous values,
- averages over a period,
- totals over a period,
- maxima or minima over a period.
- sometimes as:
- anomalies relative to re-forecast data
- an assessment of how extreme the anomalies might be (Extreme Forecast Index and Shift of Tails).
Medium range forecasts
Twice daily runs based on data times 00UTC and 12UTC are given in the ECMWF dissemination schedules:
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