Here’s LWX discussion on why raising their snow totals.
I performed a cursory analysis of current conditions this morning and I found that temps are running a few degrees cooler than forecast with dewpoints in the single digits. Up stream observations in NC and southern VA suggests that snow is over performing. I have adjusted my snow ratios this morning to account for the well below freezing layer ahead of the precipitation which should allow for higher snow rates. Initial onset of precipitation is on track this morning and snow should fluffy to start before switching over to wet snow as the layer starts to warm and transitions over to a wintry mix for most areas along and east of I-81. I will continue to monitor current conditions to see if I need to up snow totals. It wouldn`t surprise me if we get higher snow totals further eastward than expected due to extremely cool air mass ahead of this system.