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Definition of Semi-permanent pressure systems

Semi-permanent pressure systems Definition from Science & Technology Dictionaries & Glossaries
WEATHER&METEOROLOGY
A relatively stable, stationary pressure-and-wind system where the pressure is predominately high or low with the changing season. They are not of a transitory nature, like migratory lows that develop from temperature and density differences. Examples include the Icelandic Low and the Bermuda High in the North Atlantic.