My theory:
When POTUS tweets the "Tweet", i.e. the Storm is upon us, everyone else will assume its the Hurricane, which it will be.
What I also think will happen is that the Hammer will drop and the NG along with Seals/Marines etc. will carry out the big name mass arrests.
People on the East Coast and South arent going to take to the streets to protest anyway because of the storm.
It will be quick and swift.