As promised here is the before noon update:We will be seeing a few snow showers around this evening this is ahead of the bulk of the precipitation that is down in the central plains.
A high is still in control of the region and will moving off the eastern coast within the next few hours. The low that we are concerned with is over Western OK and far Northern portion of the state of Texas.
As the low begins to strengthen today there is a threat of severe weather for the LA, Eastern OK and Texas. Check the National Predication center for updates.
As the low begins to move up across the southern United State and begin to pull a little north the precipitation in the Pittsburgh will begin. This should begin towards daybreak tomorrow morning. I think we will see around the Pittsburgh, 2-4 before lunch time tomorrow. Their is quite a bit of uncertain however with this system because if the track moves one way or the other it could be very heavy snow for Pittsburgh or heavy snow changing over to Snow, Sleet and Freezing rain then changing but over to snow. This is what I believe will happen south of the Pittsburgh area. 
I think this map to your left is a little misleading. The heaviest snow I believe will shift eastward from where Accu-weather has put it. The wintry mix will happen but south of the city we might get an hour or mix and then change right back into snow.
I think that Downtown will see Pittsburgh the 6 -8", South of Downtown 4-8" and North and East of the city 8 -12". The laurels will probably receive a foot out of this storm. These have a chance to go either down or up in accumulation depending on the track of the Low. I will update before 3 pm.
The fronts maps: http://www.intellicast.com/IcastPage/LoadPage.aspx
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