27 Plus Katrina...
Katrina was the 28th hurricane to strike New Orleans since the National Weather Service began tracking storms in 1860. The National Hurricane Center's historical storm track viewer illustrates the path of these 28 storms showing that while some took pretty straightforward paths to the mouth of the Mississippi others wandered wide and circled around before making landfall.
I only post this to keep folks on their feet. Just because Ernesto is "weakening" and veering toward the west coast of Florida doesn't mean it won't threaten the already wrecked Gulf Coast. Meteorology is imperfect, and storm forcasting is highly imperfect. A storm could easily change direction and strengthen regardless of what forcasters say.
And even if it does veer this way and spare New Orleans it'll be heading toward the Florida Keys. It's not widely known, but the Florida Keys were decimated by last year's hurricanes, as were areas outside of the Gulf Coast.