Thanks, Snowman. I missed your reply the other day. I didn't want to sound to crazy with the numbers, but I believe it was actually more than eight degrees in a few minutes. I was working right at the east foot of South Mountain in Dillsburg. I'm familiar with mixing, compressional warming, and forcing but what I experienced at the foot of south mountain was exceptionally extreme from what i've experienced outdoors in my lifetime and i've experienced a lot. I wonder how many times i've experienced compressional warming compared to other surface warming dynamics ? Based on what I experienced the other day, I would have to say not much. It definitely feels different.I'll recognize it next time, if that's what it was.