A 35-foot surge (for this purpose, that's assuming a 5-foot-higher-than-normal tide) would pack a considerably greater punch than a 30-foot wall of water would .... buildings that might withstand the 30-foot surge could fall under the force of an even greater surge. And the higher the surge, the farther inland it would reach.
True that the surge is the major problem but a high tide will compound the danger and damage.
And thank you for your service to our country .... :-)