wxman57 wrote:A few points:
1. Wilma went from a 65 mph TS to a 165 mph Cat 5 within 24 hours.
2. Rita went from a 65 mph TS to a 165 mph Cat 5 within 36 hours.
3. Saffir-Simpson deals only with peak winds, not surge. There is no such thing as a "Cat 3 surge". Katrina and Rita proved that. It's the radius and extent of maximum winds that determines the surge, not the peak in any one quadrant of a hurricane. Katrina's "Cat 3 surge" was larger than Camille's "Cat 5 surge". Rita was basically a borderline 2-3 at landfall and produced a 15-20 foot surge.
4. Our ability to predict hurricane intensity has not improved significantly in the past several decades. The explosions of Wilma and Rita were not well-predicted.
5. You'll have to make your decision to evacuate 2-3 days before landfall, long before you really know how strong a hurricane might get when it hits. That's easily long enough for that moderate TS to become a Cat 3-4 hurricane before moving ashore.
Bottom line is that if you're in any surge zone you'd better be prepared to evacuate for ANY tropical cyclone, no matter how strong it is 4-5 days out. You won't be able to wait to see what the landfall intensity will be before having to make your decision to leave. Forecast intensities could be 1, 2, or 3 categories off 3-4 days away from landfall. So those of you that say you'll leave for a Cat 3 or stronger need to consider that you'll need to evacuate when that strong TS or Cat 1 is heading at you 2-3 days away, as it could easily be that Cat 3 at landfall - even though it's predicted to "only" be a Cat 1 or Cat 2.
Somebody ought to put the above post in a nice frame and sticky it at the top of board for the rest of the season. It is, without a doubt, one of the best responses to this issue I've yet to see on S2K.
Every point is "spot on". Great post, wxman!!