A region can have a high specific humidity and low relative humidity because large amounts of water vapor in the air and very high air temperatures will cause the specific humidity to be high, but the relative humidity to be low.

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Quizplus · Accepted Answer

Specific humidity is a measure of the actual amount of water vapor in the air, regardless of temperature, while relative humidity is a measure of the current amount of water vapor in the air relative to the maximum amount of water vapor the air can hold at that temperature. High temperatures increase the air's capacity to hold water vapor, so even if there is a lot of water vapor, the relative humidity can be low if the air's capacity to hold water vapor is not fully utilized.

A Region Can Have a High Specific Humidity and Low