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The sky appears blue to the human eye as the short waves of blue light are scattered more than the other colours in the spectrum, making the blue light more visible.
An extremely rare phenomenon where a cloud produces a billowing wave pattern. They occur when there is a strong vertical shear between two air streams causing winds to blow faster at the upper level than at the lower levels.
These lens-shaped orographic wave clouds form when the air is stable and winds blow across hills and mountains from the same or similar direction at different heights through the troposphere.
When snow or icy roads are forecast you should adjust your driving to suit the conditions and take extra care.
Please note that when changing units, only forecasts and maps will be affected.