Folks in Texas within 100 miles of the point of landing, now projected to be Matagorda, may want to keep an eye on stream gages.

http://waterdata.usgs.gov/tx/nwis/rt

Just click on the dots and watch the river flow.

For example, I clicked on a dot in the tidal zone near the land fall and got this graph.

http://waterdata.usgs.gov/nwis/uv?08162506

You can see the tide go in and out. By playing with the data & graph you can lengthen or shorten the graphed time period. When the edge of the storm is nearing land is when to start watching the tide gage (unless it gets wrecked by the storm! Always a possibility). That will give you an idea about storm surge.

Also, expect torrential rains. Local areas are likely too see rates of greater than an inch per hour. That part of Texas, being flatter than a politician's joke, will see nearly instantaneous flooding from heavy and prolonged rain.

Combine that with the "water dam" formed by the storm surge, which backs-up a bayou like a ladies toilet at a rock concert, will cause rapid local flooding before the storm surge gets ashore.

Finally, the inland track looks like it may pass over the Edward's Plateau. That's good news for the aquifer but sucks for home owners along the Guadalupe River and its tributaries. All of those scenic little steep canyons will be the death of cattle, sheep deer and adventurous boaters.

http://waterdata.usgs.gov/nwis/uv?08167500