It seems like the only way we can get snow this year is from departing cold air and warm air overrunning it, and this system looks to do the same.

We’ve got two waves of precipitation coming with the first during the overnight hours tonight. Light precipitation will begin this evening which should be snow for the entire region, and continue overnight. Warm air will try to push in from the south, but I think all areas north of the ICC will have some form of frozen precipitation overnight. Hopefully, it’s just snow because anything else makes untreated surfaces very slippery. Accumulations will be a coating around DC, to up to 3 inches along the MD/PA line, but generally 1 – 2″ across central MD. Tomorrow’s AM commute will likely be impacted.

Precipitation may briefly end before sunrise Monday, but another surge of moisture will begin during the morning hours. There is hope that surface temperatures will rise to above freezing during the lull in precipitation, but models are differing on whether that happens. My guess is that the cold air holds on longer across central MD and tomorrow still brings more wintry precip, but I’ll update that later tonight or first thing in the morning.

For areas north of I 70, the next 24 hours could end being a sizable snow maker, especially with tomorrow’s steadier precipitation. I’m hopeful that the cold air across central MD holds and tomorrow brings some good snows to the majority of us too, but no way to know that now.