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A ridge is an elongated region of relatively high atmospheric pressure, the opposite of a trough. A trough is an elongated region of relatively low Atmospheric pressure, often associated with fronts Unlike fronts there is not a universal symbol for

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Geopotential height is a vertical coordinate referenced to Earth's Mean sea level — an adjustment to geometric height ( Elevation above mean sea level using the Blocks in Meteorology are large scale patterns in the Atmospheric pressure field that are nearly stationary effectively "blocking" or redirecting migratory A trough is an elongated region of relatively low Atmospheric pressure, often associated with fronts Unlike fronts there is not a universal symbol for
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