- (B) Differences in air pressure help cause winds and affect air masses. They
are also factors in the formation of storms such as thunderstorms, tornadoes,
and hurricanes. Differences in air pressure are shown on a weather map with
lines called isobars. The weather map illustrates isobars marking areas of
high and low pressure. High-pressure areas generally have dry, good
weather, and areas of low pressure have precipitation. On this weather map,
the only area of low pressure is centered in the Midwest.
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