First off lets talk about the Chicago part of this event.  One thing in common Philadelphia has with Chicago is the lack of snow this winter.  The last blizzard fizzled out for Chicago only producing around 3" (similar luck to us in Philly).  But right now I have a good feeling the Chicago snow drought will take a big hit with a nice snow event to close out February.  

Elevated CAPE/convectively unstable layer extending into most of the dendritic growth zone is a very favorable set up for heavy snowfall rates.  In the beginning of the storm the heavy snow will rush in as the convection feeds into the snow band, but shortly after in the evening this convectively unstable layer will be released and allow for another enhancement.  

The snow is in no rush to shut off as the fetch off Lake Michigan/deformation zone continue into Wednesday

Where: Chicago

When: Noon-1pm CST Start

           1pm-10:30PM Heaviest

           10:30PM-6PM Wednesday Light to moderate snow

Totals: 5-9"