At 2 pm the air temperature is 30 °C and the wet‑bulb temperature is 22 °C. Using the approximation $e = 6.112\exp\bigl(\frac{17.62T}{243.12+T}\bigr)$ (hPa) for saturation vapour pressure, compute the relative humidity (RH = 100 · e_{wb}/e_{t}). State the RH to the nearest percent and indicate whether thunderstorms are likely if RH  70 % is required.

Question

At 2 pm the air temperature is 30 °C and the wet‑bulb temperature is 22 °C. Using the approximation $e = 6.112\exp\bigl(\frac{17.62T}{243.12+T}\bigr)$ (hPa) for saturation vapour pressure, compute the relative humidity (RH = 100 · e_{wb}/e_{t}). State the RH to the nearest percent and indicate whether thunderstorms are likely if RH > 70 % is required.

Accepted Answer

Relative humidity ≈ 62%; thunderstorms unlikely

Waec Model Questions Vol1 2017 Geography Question 19

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