The Federal government or any agency of it would NOT warn of an impending disaster that couldn't be mitigated.And I'll tell you something else, the more I hear about this the more I think an impact is possible. To deflect .85 lunar distance even if the data were real would take very little force.
The bottom line is we won;t know until the day after, and by then Paris or Montreal or some other large city along with the surrounding several hundred miles could be a memory.

THE FEDERAL GOVERNMENT OR ANY BUREAUCRACY THEREOF WILL NEVER SERVE ANY USEFUL FUNCTION TO PRESERVE HUMAN LIFE, THEY ARE IN THE BUSINESS OF ELIMINATING IT.