What is the meteorological feature described as a low-pressure, mid-latitude weather system characterized by converging winds and ascending air that rotates counterclockwise in the Northern Hemisphere?

What is the meteorological feature described as a low-pressure, mid-latitude weather system characterized by converging winds and ascending air that rotates counterclockwise in the Northern Hemisphere?

• A. Front
• B. Hadley Cell
• C. Intertropical Convergence Zone
• D. Extratropical cyclone

Answer: (D)

Extratropical cyclones are low‑pressure systems that form in the mid‑latitudes and drive much of the storminess there. Surface winds converge toward the low, rise, and organize into a rotating circulation. In the Northern Hemisphere, the Coriolis effect makes this rotation counterclockwise around the low‑pressure center. These systems often feature warm and cold fronts spiraling away from the center as different air masses interact. The other options aren’t describing mid‑latitude lows: a front is just a boundary between air masses, not a standalone low‑pressure system; the Hadley cell is a large tropical circulation, not a mid‑latitudes cyclone; the Intertropical Convergence Zone sits near the equator where trades meet, not in mid‑latitudes.

Extratropical cyclones are low‑pressure systems that form in the mid‑latitudes and drive much of the storminess there. Surface winds converge toward the low, rise, and organize into a rotating circulation. In the Northern Hemisphere, the Coriolis effect makes this rotation counterclockwise around the low‑pressure center. These systems often feature warm and cold fronts spiraling away from the center as different air masses interact.

The other options aren’t describing mid‑latitude lows: a front is just a boundary between air masses, not a standalone low‑pressure system; the Hadley cell is a large tropical circulation, not a mid‑latitudes cyclone; the Intertropical Convergence Zone sits near the equator where trades meet, not in mid‑latitudes.