In the first part of this series, we talked about isobars, so this time we’re going to talk about isotherms. Remembering the blank Skew-T diagram from wikipedia with it’s jumble of lines and values, the straight horizontal lines represent our isobars and are how we measure pressure and height. The next axis we are going to talk about are the isotherms. These are straight lines starting in the south west corner of the Skew-T and heading to the north east. Not a whole lot of magic in the isotherms, it’s just the temperature C. When we talk about temperature on a Skew-T, it’s always in C. Next, saturation lines.