Squall

A squall or gust ( to Dutch bui and probably onomatopoeic origin) is a powerful air movement (wind shock ) of short duration. It is often associated with a wind shift and often occurs in conjunction with rain, sleet, hail, snow squalls or thunderstorms as ( downburst ).

Meteorological it is called a squall when the measured 10 -minute average wind speed within a few seconds (maximum 20, minimum of 3 seconds persistently ) is exceeded by at least 5.0 m / s (10 kn). The DWD additional distinction between squalls, which apply at wind speeds of 62 km / h ( 8 Bft ) and hurricane-force winds that from a speed of 103 km / h (11 Bft) occur.

If the gusts within a linearly arranged area, so called this region gust front. Some gusts regularly occurring have their own name, for example, the Boorga in Alaska. Gusts with vertical flow direction is referred to as Fallbö. A special weather phenomenon at sea cause large waves, and can be fatal because of the sudden storm for sailing ships that White Squall is ( engl. white squall ).

Gusts are examined, among other things with gusts clerk who receives only the current wind speed in contrast to the anemometer, but not the direction of the wind.