If it went west, wouldn't landfall be later in the week rather than Monday?
But two days out is usually the best you can predict these storms, and sometime less than that. Occasionally, the ridges and troughs are so entrenched that what will happen is a slam dunk.
Like with Jose earlier this week. Never a chance of him doing anything different than he did.
But Katrina is different because she's nowhere near dying out over land. She's going to become a hurricane again after weakening to a tropical storm.
And the trough may or may not make it down to the coast in three days to move her north.
It probably will, but a delay of 12 hours will mean a landfall of dozens of miles further west.
As far as the second landfall, we're just speculating now. Our thoughts and prayers are with the people of south Florida who are dealing with her now. The rest of us can probably seriously begin worrying on Sunday because so much can happen between now and then to affect the forecast.