 So, I wanted to give you a few examples on how to lift parcels triadiabatically on a skew T. Now, of course, the advantage of using a skew T is that if we were to do these types of manipulations just using the mathematics, it gets fairly messy. And so, when we have a skew T, we simply just use the lines on the skew T. That's what they're there for. So, this is a very powerful tool in moving parcels up and down in the atmosphere. So let's start with this point here. I chose this point on the sounding, but you don't have to. In fact, I can turn off the sounding and all the calculations that we're going to do are exactly the same, whether that line is there or not. So this parcel has a pressure of 700 millibars. It's temperature, here's the 0C isotherm, so it's a little bit to the right. So maybe let's say 3C. Let's lift that parcel up to 500 millibars triadiabatically. So, one of the reasons I chose this point is actually because it sits on a triadiabat. The lines that move up and to the left are triadiabats. They're slightly curved, but not as curved as maybe some of the other lines. On this skew T, they're dark red, but on different skew T's, they may be different colors. So to lift this parcel, I simply just follow this triadiabat up to 500 millibars. Let me turn that path on for you. So here we go. So this is what this parcel looks like if it were forced up to 500 millibars. And the temperature is about, oh, minus 24 C. We're a little bit this side of halfway between minus 20 and minus 30. So that's all there is to it. Let's look at another point. So at this point I've chosen because it does not sit on a triadiabat. And so what we have to do is construct our own. There are many, many triadiabats, an infinite number really, on this skew T. It's just that only certain ones are drawn, but they all exist. And so I have to construct my own triadiabat. And let's take this parcel up to 350 millibars. So let me turn that path on. So notice I've drawn a triadiabat for this parcel that's parallel to the one on either side. And I can use those as a guide and take it all the way up to 350 millibars and read off its temperature. So this is minus 40, so this is minus 50. So I'd say minus 53 or something like that. Now I don't just have to move the parcel up, I can also move the parcel down. Let's look at that one. Let's take this parcel and let's say there's mixing going on and this parcel is forced down to the surface by that mixing. What will its temperature be? Well, I need to construct a triadiabat from here down to the surface. That's what that looks like there. Down at the surface, if I force that parcel all the way down, it's going to have a temperature of about 25 C, right, between the 20 and the 30. So we can move parcels in both directions and picking them anywhere. You can pick a parcel out here and move it up and down. And so I think you'll find this is pretty straightforward. You have to practice it a little bit. So go and grab a skew tee and find some parcels and move them up and down and see if it doesn't become a little bit clear. It takes a little bit of a practice to construct your own parallel to the lines that are drawn. All right, I hope this helps.