Meteorology 101 tells us when the temperature and dew point are equal, the relative humidity is 100% and clouds will form. The farther apart the temp and dew point, the lower the relative humidity. On the Skew-T chart, notice the temperature and dew point are very close together in the lower 5000 feet of the atmosphere.

In the Skew-T, we see a saturated low layer where the green and red lines are almost touching one another (temperature and dew point). This is the low cloud we’re looking for! Then there is a sharp rise in temperature above this and a drop in moisture. This is called an inversion and is where we will find the cloud top.