We investigate the potential for using the downward propagation of anomalies from the stratosphere to the troposphere in extended-range statistical forecasts. Considering the near-surface zonal mean zonal wind at 60°N and the near-surface temperature in northern Europe as predictands, we find that the inclusion of stratospheric information improves the daily forecast on lead times larger than 5 days. The best forecasts are obtained for predictors in the lower stratosphere. Similar predictions cannot be ob…
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