RAIN SNOW LINE NAILED DOWN?

Nailing down the rain-snow line in a storm which hugs the coast can be a fruitless endeavor. I will share, technically some of the charts that I use to do that on the Cape. (CLICK ON THE CHART LEFT) Note, this is a very unusual storm coming up, one that is this close with winds off the water usually bring on rain. It is so cold aloft though , that the vertical profile of the atmosphere is showing a mix on the outer cape for a couple of hours near Noon on Sunday and that is it, with a few hour change to rain possible on Nantucket. The chart left (click on it) also shows the very "good" rain-snow line indicator for New England, called the 1000-850 mb thickness line. I studied this back in college in a special report in the late 70s, and it has also since become a standard rain-snow indicator in mid winter. Note that it DOES creep up and pass Nantucket for a brief time on Sunday early afternoon, but then it retreats back out to sea for the rest of the storm, meaning any rain will be short lived, we are about to be blasted!