That's where we joke about the PF currier and ives band, it's like 600mb many times. All those times where we said that you would get decent snows...it was from the area above 700. Sometimes looking at 500mb VVs will help you interpolate between 700 and 500 to get an idea. You can also look at the temps at those levels to get an idea of roughly where the -12 to -18c layer is.