Wednesday December 16th is worth watching for snow/ice threat.

After literally no real threats last winter, December 16th maybe worth watching for a winter event. 

Sunday night into Monday brings in MORE rain, adding to our record setting year of precipitation in Lynchburg. At this point the plot thickens..

What we know-

1. Cold air is building in from the North and west Tuesday into Wednesday.

2. Storm associated with a short wave develops in the mid south. 

What we don't know-

1. How much cold air will be in place. This matters greatly for obvious reasons. 

2. Storm track- Some data shows this as a "Miller B" where a low forms and moves to our west while a secondary low forms off the Atlantic cost somewhere.  With our proximity to the mountains, often this means we warm at the mid levels but not at the surface.  Snow usually changes to ice in these set ups, faster the further south and east you are located from Lynchburg. 

When will we know?

Wednesday is 5 days away so generally we know there should be a storm that day and enough cold air should be in place for for some winter precipitation.  General ideas of what to expect should be in place by Sunday. 

Highest risk for snowfall will be places along I-18 from the Mt Empire, through the NRV, Roanoke and heading towards Harrisonburg. A change or mix to ice and even rain very much in play here too. 

Next risk Level would be Smith Mountain lake towards Lynchburg with Snow and ice combination likely that could end as rain. 

Lastly, Southside including Martinsville, Danville and South Boston would have the lowest risk but snow/ice and rain are likely. Still may end up with a significant winter event. 

General rules I follow about these type events. 

1. We tend to warm at the mid levels faster than modeled- meaning if a mix or change may happen, I usually speed it up on my forecast.

2. Surface temps like to be colder than modeled in this set up. Cold air damming (Surface high to our north that forces cold air down the east side of the mountains) tends to be stronger than modeled. A change to ice doesn't mean warmer at the surface. I usually lean a few degrees colder at the surface. 

Will send updates as needed as more data becomes available. It seems like there could be a decent amount of moisture associated with this event-  from .75 to maybe 1.25 inches of liquid equivalent, meaning whatever falls (Snow, Sleet, Freezing rain and or rain) will be impactful to your work week starting late Tuesday and into Wednesday and Thursday.