Meteorology · Pressure Systems — Ridge and Trough
On a synoptic chart, a 'ridge' is:
- AAn elongated area of low pressure with bad weather
- BAn elongated extension of high pressure, generally associated with fair, settled weather✓ Correct
- CA closed low-pressure center
- DA boundary between two air masses
Explanation
A ridge is an elongated region of relatively high pressure (the opposite of a trough, which is elongated low pressure). Ridges bring subsiding air and fair weather; troughs often contain fronts and unsettled, showery conditions.
Authority: WMO; Bowditch (Pub. No. 9), pressure systems
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