You might want to begin by visiting exploring the relationship between temperature and dew point near the surface and the altitude at which those puffy summertime cumulus clouds form.

Then you should explore growing a cloud by adjusting the vertical profile of temperature and dew point temperature. Just position the cursor over one of the data points and then drag the cursor (press and hold the button while moving) to increase or decrease the value. For starters, make the lower part of the atmosphere warmer and wetter (increase the temperatures and dew point values). Can you make a cloud grow?