HAAR

This is one of the most frustrating kinds of weather to affect Britain, though fortunately, only very limited areas are likely to experience it. The most likely places to suffer from it are the east coastal fringes of Scotland & N.E. England.

It is most likely to occur during settled conditions in summer, when the airflow is from an easterly quarter, causing warm air to flow across a much colder North Sea. The haar may stick to a narrow coastal strip & it may be possible to walk into sunshine & blue skies. At other times, it may penetrate further inland, particularly into Firths & forecasters have a very difficult job giving precise information. The haar is invariably shallow & large ships at sea may have their masts sticking out of it.The most frustrating occasions are when haar occurs during a heatwave, with 95% of the country having wall to wall sunshine & temperatures up to 25 to 35,while some places on the east coast struggle to 12 or 13.