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Note: HRES and Ensemble Control Forecast (ex-HRES) are scientifically, structurally and computationally identical.  With effect from Cy49r1, Ensemble Control Forecast (ex-HRES) output is equivalent to HRES output where shown in the diagrams.   At the time of the diagrams, HRES had resolution of 9km and ensemble members had a resolution of 18km.

Other causes of errors in temperature and dew point at 2m

...

Users should recognise the impact that low-level moisture has upon temperature forecasts; if humidity is too low then maximum temperatures can be forecast to be too high.


(FUG Associated with Cy49r1)