Katina's surge in Mississippi was 28-29 feet in places. The Texas coast and Galveston Bay in particular are even more prone to amplify surge than the Mississippi coast. Jeff Masters is forecasting up to 25 feet at the coast. Contrary to what you might think, the surge at the top of Galveston Bay will be even higher than the max surge at the coast. So if the surge at the coast is OVER 25 feet, it means it could be well over 30 feet at the top of the bay. ANYONE in a shaded area in the Houston/Galveston storm surge map should get out before they know for sure they have to. By the time you know for sure, as those idiots on the Bolivar Pensinsula did, it's too late and the authorities have to risk their lives to save you, just as all your compatriots in Lousiana did when they chose to stay put. So don't lecture us, dude. Your kind of Big Easy attitude put the lives of thousands of Coast Guarders and other authorities at risk.
Here's what Dr. Masters has to say:
According to the latest NWS forecast from the Galveston office, we can expect the following storm surges in Texas:
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Shoreline of Galveston Bay...15 to 25 feet
NOAA's experimental storm surge forecast is calling for a 10% chance that the storm tide from Ike will reach 27-30 feet on the south and east sides of Houston.
Those are worst-case scenarios, as Dr. Masters points out here:
We've put together today a page of storm surge risks for the Texas coast. These images show the maximum storm tide (storm surge plus an adjustment for hitting at high tide) expected from a mid-strength hurricane of each Saffir-Simpson Category hitting anywhere along the coast of Texas at high tide. These so-called "MOMs" (Maximum Of the Maximum Envelope Of Waters) are computed using NOAA's SLOSH storm surge model. A sample image is shown in Figure 1 for a Category 4 hurricane affecting the Galveston area. A storm of this magnitude is expected to bring a maximum 22 foot storm tide (storm surge plus a 2-foot adjustment in case it hits at high tide) to Galveston. A maximum 28-foot storm tide could affect the built-up areas along the east side of Houston. Note that some Category 4 hurricanes making a direct hit on Galveston will bring a significantly lower storm surge than the worst-case 22-foot scenario pictured here.
Your prediction of "well over 30 feet at the top of the bay" is unfounded, hysterical, and irresponsible fear-mongering.