 Let's see how to find the equivalent potential temperature called theta e on the skew t. The equivalent potential temperature is the potential temperature that an air parcel would have if all this water vapor would convert to liquid water, thus warming the air, and then the liquid water was removed. To find theta e, we find the LCL. Go up to the moist adiabat until it's parallel with the dry adiabats. And then go down the dry adiabat that matches the moist adiabat until we reach the pressure of 1,000 millibar. In this case, theta e is about 330 Kelvin or 57 degrees C. Note that the lines aren't marked with such high temperatures. But we can determine which temperature this line represents by looking at the 360 Kelvin dry adiabat and then counting one, two, three lines over where the lines are in intervals of 10K.