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Precipitation over mountainous coasts and islands

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In reality the showers take time to grow while also being driven downwind.  The snow that falls from them also drifts downwind as it falls.  However, neither "drift" mechanism is represented in the IFS and the net effect is that the snow in reality is spread across a much larger distance downwind than in the raw model output .  

Fig9.6.2-1:   The diagram shows an area of NW Scandinavia with snow accumulation indicated by colours (large accumulations blues, small amounts, green).  Topographically the area is complex, but the key feature are strong upslopes near the exposed NW coast of Norway, with a line of mountains reaching about 2000m but interspersed with lower lying gaps.  

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