This is my first post, so be gentle :-)
I've been lurking for a while, trying to get my head round the processes that have conspired to affect our weather so dramatically this winter. I must admit I've found the Models forum very...er...challenging, seems to have been a lot of "wishcasting" as well as a fair amount of trolling, but some of the posts are absolutely fantastic for someone like me trying to understand the atmosphere - Gibby and Tamara in particular.
I used to do a lot of winter mountaineering and would always watch the 850 temps to see where the freezing level (and thus snow) might be. I also learned a little about heights, in particular that 528 /510 DM heights would be *likely* to produce snow down towards sea level - don't know if that was right? If it is, looking at GFS into next weekend, it looks like we will be under 510 or even 492 DM air - like the current GFS run out to 144 hours. Does that not mean snow?