Which type forms outside the tropics?

Master the Navigation, Seamanship, and Shiphandling (NSS) – Officer of the Deck (OOD) Phase 2 Exam with engaging flashcards and multiple choice questions, complete with hints and explanations. Prepare comprehensively for your test!

Multiple Choice

Which type forms outside the tropics?

Explanation:
Extra-tropical storms form in the temperate zones outside the tropical belt. They develop in mid-latitudes where large horizontal temperature contrasts and the jet stream provide the energy, creating fronts and a typical asymmetric structure. This contrasts with tropical cyclones, which require warm sea-surface temperatures and low vertical wind shear to form inside the tropics and tend to be more symmetric and warm-core. Sub-tropical storms form near the edge of the tropics, between tropical and mid-latitude regions, so they aren’t as far outside the tropics as extra-tropical systems. An anticyclone is a high-pressure feature and not the cyclone type defined by formation region, so it doesn’t fit the description of forming outside the tropics in the same sense.

Extra-tropical storms form in the temperate zones outside the tropical belt. They develop in mid-latitudes where large horizontal temperature contrasts and the jet stream provide the energy, creating fronts and a typical asymmetric structure. This contrasts with tropical cyclones, which require warm sea-surface temperatures and low vertical wind shear to form inside the tropics and tend to be more symmetric and warm-core. Sub-tropical storms form near the edge of the tropics, between tropical and mid-latitude regions, so they aren’t as far outside the tropics as extra-tropical systems. An anticyclone is a high-pressure feature and not the cyclone type defined by formation region, so it doesn’t fit the description of forming outside the tropics in the same sense.

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