On weather maps, which feature is an elongated area of relatively lower pressure (or lower heights in the upper air)?

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Multiple Choice

On weather maps, which feature is an elongated area of relatively lower pressure (or lower heights in the upper air)?

A trough on weather maps is an elongated area of relatively lower pressure (or lower geopotential heights in the upper air). It shows up as a long, dip-like feature in the height fields and is often associated with unsettled weather because cooler air aloft and vertical motion tend to develop along its axis. Surface lows frequently sit under or near the trough, reinforcing the low-pressure pattern. Ridges are the opposite: elongated areas of higher heights (high pressure in the surface sense). An isobar is simply a line of equal pressure, not a weather feature itself. A front is a boundary between air masses, not specifically an elongated low-height region, though fronts can extend along trough lines and be linked to the same weather patterns.

A trough on weather maps is an elongated area of relatively lower pressure (or lower geopotential heights in the upper air). It shows up as a long, dip-like feature in the height fields and is often associated with unsettled weather because cooler air aloft and vertical motion tend to develop along its axis. Surface lows frequently sit under or near the trough, reinforcing the low-pressure pattern.

Ridges are the opposite: elongated areas of higher heights (high pressure in the surface sense). An isobar is simply a line of equal pressure, not a weather feature itself. A front is a boundary between air masses, not specifically an elongated low-height region, though fronts can extend along trough lines and be linked to the same weather patterns.

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