Shortly after Harvey was upgraded to a Category 1 hurricane, Edwards warned that its path remains uncertain and that the storm still poses a risk for Louisiana - now most directly in Southwest Louisiana but potentially all parts of the state over the coming weeks due to heavy rains and already rain-saturated ground.
Harvey is forecast to come ashore as a Category 3 hurricane, the US National Hurricane Centre said, the third most powerful on the Saffir-Simpson scale, which would make it the first major hurricane to hit the mainland United States since Hurricane Wilma struck Florida in 2005.
The Gulf Coast of Texas is right in Harvey's path. Residents and business owners are boarding up in preparation for the hurricane.
Corpus Christi has many low-lying areas and a barrier island.
Hurricane Harvey is expected to hit a refinery-rich stretch of the Gulf Coast and USA drivers could soon see the impact at the gas pump. Abbott on Thursday activated 700 members of the Texas Army Guard, Texas Air National Guard and the Texas State Guard in as a precautionary measure.
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At 1 p.m. EDT Wednesday, Harvey was located 470 miles (755 kms) southeast of Port Mansfield, Texas. "The storm surge has potential to do damage along the coast line and maybe even in Flour Bluff", Vogelsang said. The eye of Harvey is expected to reach the Texas coast in the wee morning hours of Saturday.
Harvey "may be nothing short of a flooding disaster", for Texas, according to AccuWeather meteorologist Alex Sosnowski, who said that some communities could be underwater for days. Some 700,000 people live where a hurricane warning is in effect, roughly half of them in the Corpus Christi area.
Forecasters said the storm could also generate swells with potentially life-threatening surf and rip current conditions in the Texas, Louisiana and northeast Mexico coasts by Friday. The storm killed 21 people in Texas, Louisiana and Arkansas, and caused widespread destruction.
Trump's recently appointed Chief of Staff John Kelly previously served as Homeland Security Secretary.
Energy companies are evacuating personnel from off-shore production platforms, the US Bureau of Safety and Environmental Enforcement announced.