Assertion A The surface winds spiral inwards upon the centre of the cyclone Reason R Air ascends at ...........

Geography Atmosphere

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Assertion (A): The surface winds spiral inwards upon the centre of the cyclone.

Reason (R): Air ascends at the centre of the cyclone.

Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true but (R) is not the correct explanation of (A).

(A) is true but (R) is false.

(A) is false but (R) is true.

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Explanation:

Cyclone is a large scale air mass that rotates around a strong center of low atmospheric pressure. Cyclones are characterized by inward spiraling winds that rotate about a zone of low pressure. The largest low-pressure systems are polar vortices and extratropical cyclones of the largest scale (the synoptic scale). Warm-core cyclones such as tropical cyclones and subtropical cyclones also lie within the synoptic scale. Upper level cyclones can exist without the presence of a surface low, and can pinch off from the base of the tropical upper tropospheric trough during the summer months in the Northern Hemisphere. The surface winds spiral inwards upon the centre of the cyclone because air descends at the centre of the cyclone.