@brianmapes pointed out this paper: http://romps.org/pubs/pubs-2016-lcl.html that has an analytic LCL. The code on the author's webpage has some syntax/import issues. It would be interesting to compare this to our LCL implementation in terms of results and speed and possibly implement it in MetPy.