What is the difference between a trough and a ridge on weather maps?

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Multiple Choice

What is the difference between a trough and a ridge on weather maps?

On weather maps, troughs and ridges describe the height and pressure pattern in the atmosphere. A trough is an elongated region of relatively lower heights (and typically lower pressure), while a ridge is an elongated region of higher heights (and typically higher pressure). This is why, on upper-air charts like the 500 mb map, troughs show up as dips in the height contours and ridges as bumps. This contrast explains why the trough is linked with lower heights and the ridge with higher heights. It’s not about a surface front or dry line, nor about wind speeds alone—the defining feature is the relative height (and pressure) anomaly along the elongated pattern.

On weather maps, troughs and ridges describe the height and pressure pattern in the atmosphere. A trough is an elongated region of relatively lower heights (and typically lower pressure), while a ridge is an elongated region of higher heights (and typically higher pressure). This is why, on upper-air charts like the 500 mb map, troughs show up as dips in the height contours and ridges as bumps.

This contrast explains why the trough is linked with lower heights and the ridge with higher heights. It’s not about a surface front or dry line, nor about wind speeds alone—the defining feature is the relative height (and pressure) anomaly along the elongated pattern.

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