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It depends on where she is. If she's near an area close to the Coast, she should get to a higher and sturdier structure inland. If she's in an area that has flooded in any of the Houston floods in the last decade, she should get inland.
Hurricanes are all different, and unpredictable. Some have massive storm surges, some have a lot of tornadoes, some have strong winds. I mean, all of them have all three of those, but in different proportions. Some weaken quickly, others don't.
The storm surge will hit anything on the coastline (and the bay) like a tsunami. That will effect anywhere from fifty yards to several miles inland, depending on elevation and obstacles. Only strong steel and concrete buildings, for the most part, will survive this. Katrina killed a lot of people by just washing their houses away. You're in your house, and a minute later you're in the Gulf with thirty foot waves slamming debris into you.
Bayous inland will rise with the storm surge, and flood everything to whatever height the surge rises. I had a friend in Waveland, MS, whose house sat on 12 foot pylons. Her house flooded past the ceiling, drowning the cat she left inside (this meant the water was over 25 feet).
If she lives off of the coast and above the bayous by 25 or more feet, her biggest problem would be wind. That's not as bad on houses as water. It can blow over massive trees, though, and they can chop a house in two, or splinter it, depending on how wide the tree is. But that's hit or miss. Not every house will be damaged. Unless it hits as a Cat 4 or 5, and then the wind can just directly destroy the house.
The other danger is flooding. Some hurricanes have a lot of rain, and since the storm surge backs up the rivers, areas that flood during rain will flood even worse during a hurricane. Houston flooded badly a few years ago because of a tropical storm, so if she was there then and knows where the water went, she'll have some idea of whether the water can reach her. Some. The house I survived hurricane Camille in was washed away by Katrina, which was not, on paper, as strong as Camille. The storm surge for Katrina was a fluke.
Basically, she should get out. It's a good time to visit family in Buffalo. If she's to the west or northwest of the city, and high enough up, and in an older home (these development homes aren't worth crap, even the expensive ones, as Andrew survivors can attest to), she might be okay. If the winds aren't Cat 5.
If she stays anyway, stock up on gas, canned food, water, and ice, enough for a week. Don't rely on a generator to run her freezer unless she has a lot of gas. Plan to be smelly and uncomfortable and to pee against trees, because the toilets won't flush. And make sure she knows where the nearest shelter is, in case she's wrong. One of my friends in Pascagoula had the water rise into her house in a matter of minutes. When it reached their ankles they ran out of the house to a neighbor's, who lived in a solid house on pylons. By the time they got to that house, the water was chest high. They were lucky there were no live powerlines under the water, that the current didn't drag anyone away, and that it was dayligt, so they could even see. And Pacagoula caught the outer edge of the storm.
That's my advice. Leave. If not, be prepared and have a shelter to go to--on foot--in case the house collapses or floods during the storm.
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