Hey. I was wondering if you guys could help me with something. I'm doing an assignment on air masses & instability etc etc. One of the things it asks me is about envirionmental lapse rates detected by a rising radiosonde. It seems fairly straightforward mostly, however it asks me to work out the average lapse rate. Here is a sketch of the graph I'm working with: When working out the average rate, should I take it from the whole of the troposphere, including the green section that is under the influence of frontal weather systems, or should i just use the blue section where the temperature loss is reasonably uniform with height? thanks in advance. Matt.