Think its as good a time as any to start this one rolling. A rather dramatic feature will move south through wednesday. Most of the precipatation at this stage looks like rain, however it will be an especially marginal situation. Evaporational cooling will really come into play here, and I think there will be some spots that see quite a bit of 'suprise snow', although at this stage I think its more speculation, where they would be.
A few tools that will be invaluable in coming days:
The high res NASA GEOS model, useful for short range forecasting out to 120: http://www.meteociel.fr/modeles/geose_cartes.php
The NAE model, invaluable for precice forecasting for a short period:
http://www.weatheronline.co.uk/cgi-bin/expertcharts?LANG=en&MENU=0000000000&CONT=euro&MODELL=nae&MODELLTYP=1&VAR=modtemps&HH=66&BASE=-&WMO=u3005&ZOOM=0
The GFS skew T: Generalised version of the 850s/dew points e.c.t only limited by the accuracy of the GFS itself.
http://www.weatheronline.co.uk/cgi-bin/expertcharts?LANG=en&MENU=0000000000&CONT=euro&MODELL=modtemps&MODELLTYP=4&VAR=pslv&HH=48&BASE=-&WMO=u3005&ZOOM=0
Finally partial thicknesses, for a happy balance between 850s and skew charts:
http://www.weatheronline.co.uk/cgi-bin/expertcharts?LANG=en&MENU=0000000000&CONT=euro&MODELL=gfs&MODELLTYP=1&BASE=-&VAR=th85&HH=48&ARCHIV=0&ZOOM=0&PERIOD=&WMO=u3005
Originally Posted by: Quantum