Suppose the wind is blowing from the west and a parcel of surface air with tempe

Question

Suppose the wind is blowing from the west and a parcel of surface air with temperature of 10 degree C and a dew point of 2 degree C begins to rise upward along the western (windward) ward side of the mountain. a. What is the relative humidity of the air parcel at 0 m (pressure 1013mb) before rising? b. As the air parcel rises, at approximately what altitude does condensation begin and a cloud start to form? c. What is the air temperature and dew point of the rising air at the base of the cloud? d. What is the air temperature and dew point of the rising air inside the cloud at an elevation of 3000 m? (Use saturated adiabatic lapse rate of 6 degree C per 1000 m) e. At an altitude of 3000 m, how does the air temperature inside the cloud compare with the air outside the cloud, as measured by the radiosonde? What type of atmospheric stability (stable or unstable) does this suggest?

Explanation / Answer

Answer: a

The relative humidity is more at surface than high elevation.

Answer: b

Condensation means phase change from gas to liquid. And it would be about at 1000m.

Answer: c

The temperature and dew point would be about 2o C.

Answer: d

The temperature is about -14o C.

Answer: e

The temperature inside the cloud is quite less than outside the cloud due to unstability between outer environment from inner environment of cloud.

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