The good news, if you see Hurricanes as bad, is that Isaac did not turn into a hurricane over night and is having trouble getting its act together. This has caused estimates of the hurricane’s maximum strength at the time of land fall to be reduced. Isaac will be a serious storm when it plows into the southern US coast but it will not be an Ivan, Katrina or Andrew.
The bad news is that the predicted track has moved even farther west, so the forward right quadrant, the “Right Punch” of the hurricane, may very well hit New Orleans at a very bad angle and position.