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Also the derivation of forecast 2m temperatures at at each grid point depends in part on the modelling of the structure of the lowest layers below 10m (L137). This  This can be influenced by the stability or instability over the differing surfaces.  In Fig9.9.4 below: 

• At point (E) there is likely to be near surface overturning due to surface heating and heat flux.
• At point (D) there is likely to be near surface stability over cool waters

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