Reviewing some of the data from this morning/early afternoon. Because of the thermal profiles of the atmosphere and the amount of energy available with the storm and especially because the main impetus for our snow will be the upper-level energy which is what we call "cold-core" - there's a chance that we could see some convection tomorrow night and the exciting phenomenon of thundersnow.
The guidance (especially the NAM) is also trending earlier with the rain to snow changeover: more like mid-afternoon than "after sunset".
And the National Weather Service has extended the Winter Storm Warning to cover the bulk of the DC Metro area.
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