A weather station recorded the following data:

06:00 - temperature 28°C, dew‑point 22°C, pressure 1012 hPa.
18:00 - temperature 24°C, dew‑point 18°C, pressure 1008 hPa.

Using the Magnus formula $e = 6.112\,\exp\left(\frac{17.62\,T_d}{243.12+T_d}\right)$ for actual vapour pressure and the same formula with $T$ for saturation vapour pressure, calculate the change in relative humidity from morning to evening and state whether the air became more or less humid. (Give the change to the nearest whole percent.)

Question

A weather station recorded the following data:

06:00 - temperature 28°C, dew‑point 22°C, pressure 1012 hPa.
18:00 - temperature 24°C, dew‑point 18°C, pressure 1008 hPa.

Using the Magnus formula $e = 6.112\,\exp\left(\frac{17.62\,T_d}{243.12+T_d}\right)$ for actual vapour pressure and the same formula with $T$ for saturation vapour pressure, calculate the change in relative humidity from morning to evening and state whether the air became more or less humid. (Give the change to the nearest whole percent.)

Accepted Answer

Relative humidity decreased by about 1% (from ~70% to ~69%)

Waec Model Questions Vol1 2023 Geography Question 35

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