Dirty High Or Ridge:

High pressure usually brings clear weather. A high pressure is termed "dirty" if it has a canopy of clouds associated with it. These clouds can form due to orography, a saturated PBL (with low level fog and/or stratus building under a middle level inversion), or lifting mechanisms within the region of high pressure (WAA, moisture advection).

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Information and definitions of the terms been taken from various reliable government publications and we have done our best to verify their accuracy. If you feel any of the definitions are incorrect or needs to be updated please contact us and we will look into it.

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