I write with resources for the storm. Right now, I do not believe any Arlington residents are without power. To learn more go to the Dominion Outage Map: Outage Map The more likely time when power may go out is during the ice parts of the storm, which are mostly ahead of us, so let's keep that in mind.
The most important thing you can do right now is stay off the roads. Do not use them if you do not have to.
We are currently in Phase 2 and will likely be there for at least the next 24 hours and perhaps a few days beyond that. though please check back at the updates link to confirm.