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If air temperature is much higher than dew point, what fire-weather indication may be inferred?

Answer and explanation

Correct answer: Air is dry and evaporative demand may be high

Correct answer: A. The difference between air temperature and dew point is called the dew-point depression or temperature-dew-point spread. A large spread means that the air is far from saturation and generally has relatively low humidity. In such conditions, dry vegetation and soil can lose moisture readily because the atmosphere has a strong capacity to accept more water vapour. This high evaporative demand can contribute to elevated fire danger when fuels are available and other weather factors, such as wind, also support fire spread. B is wrong because fully saturated air has a temperature very close to its dew point. C is wrong because a large spread does not guarantee rainfall. D is wrong because dew is most likely when the surface cools to a dew point close to the air temperature. Memory cue: large temperature–dew point spread means dry air; a small spread means moist air near saturation.

Related tags

Dew Point SpreadDry AirFire WeatherEvaporation DemandHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeography

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