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• inland, data is calculated using HTESSEL within the grid point box surrounding the location of interest.
• in coastal areas, data is calculated using HTESSEL and FLake according to the proportions of land and coastal sea cover within the grid point box surrounding the location of interest. 
• over the ocean, data is calculated using NEMO.

More details are given in the sections: Land-sea mask,  Modelling land surfaces, Modelling coastal waters, Modelling lake and coastal waters, Modelling ocean surfaces, Selection of grid points for meteograms, Selection of grid points for vertical profiles. 

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• • the impact of the grid point(s) relative to the land-sea mask, especially where surface winds might blow onshore.
  • the variation of the altitude of the land, especially when compared with the model representation of orography.   Forecast values at the grid point nearest to the location are adjusted for altitude using a standard lapse rate assumption.  The difference in temperature can be considerable.

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The chart is a section of the charts above and the data is for T+36 VT 12UTC 25 Aug 2025 DT 00UTC 24 Aug 2025.   The wind arrows are only shown to indicate the location of grid points at 9km resolution although some advection of boundary layer air is forecast moving from sea to land.  The land/sea distribution governs the proportion of energy flux from land or sea at each grid point (coloured as above).

(FUG Associated associated with Cy50r1)