Hurricane Harvey Keeps Gaining Strength (Learn More, Multi-Video)

By Nicole Chaves and Eliott C. McLaughlin, CNN

As Hurricane Harvey gains strength, residents along the Texas coast aren’t taking any chances; they’re filling sandbags, stocking up on water and boarding up windows.

Corpus Christi, where Harvey will likely make landfall, has cleared Friday’s dockets in city court and is providing self-serve sandbags to residents.

Port Aransas on Mustang Island is under mandatory evacuation orders.

Houston, meanwhile, has canceled the first day of school on Monday.

(Major hurricane forecasted to hit Texas. Courtesy of Fox News and YouTube)

Harvey is rapidly strengthening and is forecast to become a Category 3 hurricane with winds of at least 111 mph by the time it hits the middle Texas coast late Friday or early Saturday, the hurricane center said Thursday.

After hitting Corpus Christi, the storm is expected to stall over the state, forecasters say.

Hurricane-force winds are a concern as the storm builds strength in the Gulf of Mexico, and a potential deluge and subsequent flooding may be a big danger as well, according to meteorologists.

Track Harvey

“Harvey is likely to bring multiple hazards, including heavy rainfall, storm surge and possible hurricane conditions to portions of the Texas coast beginning on Friday,” the National Weather Service said.

(Increasing concern that Harvey will become a major hurricane (Category 3 or higher) before making landfall Friday night. Courtesy of The Weather Network and YouTube)

Slow storm means more rain

At 2 p.m. ET, Harvey was a Category 1 hurricane with 85 mph winds.

It was about 335 miles southeast of Corpus Christi, and was moving north-northwest at 10 mph.

It’s expected to bring 12 to 20 inches of rain to the Texas coast, with isolated instances where rainfall totals could reach 30 inches, the weather service said.

This graphic is created by the NWS/NCEP Weather Prediction Center (WPC) and shows rainfall potential for the United States when a tropical cyclone threatens land. The graphic is displayed as a Quantitative Precipitation Forecast (QPF), which shows rainfall totals for a specified time period, based on forecaster discretion. For more rainfall information, visit the Specialized WPC Precipitation Forecasts. (Courtesy of NOAA)

Rainfall amounts increase exponentially when a storm moves at a slower speed, as Harvey has been doing.

Earlier this week, the National Hurricane Center warned, “The system is likely to slow down once it reaches the coast, increasing the threat of a prolonged period of heavy rain and flooding across portions of Texas, southwest Louisiana, and northeastern Mexico into early next week.”

Compounding potential problems is the tidal cycle.

If peak storm surge arrives during high tide, parts of the coast could see 2 to 8 feet of flooding, with the potential of 6 to 12 feet between Padre Island National Seashore and Sargent, Texas.

While it has been nine years since Texas last saw a hurricane, the state is no stranger to devastating flooding from tropical systems.

In 2001, Tropical Storm Allison was a multibillion-dollar disaster for the state, specifically Houston.

Allison became nearly stationary for days, dropping more than 30 inches of rain across portions of the city.

(Weather History: Tropical Storm Allison 2001. Allison is the only tropical system to have it’s name retired without ever becoming a hurricane. Courtesy of The Weather Network, HappyMario64 and YouTube)

A hurricane watch is in effect from north of Port Mansfield to the mouth of the Rio Grande, with a storm surge watch stretching north to High Island, on Galveston Bay.

Harvey could be the first hurricane to hit Texas since 2008 when Hurricane Ike smashed the coast near Galveston.

The storm killed 21 people in Texas, Louisiana and Arkansas, and caused widespread destruction.

‘It scares the hell out of people’

As Harvey churned toward Texas, Gov. Greg Abbott declared a state of disaster Wednesday in 30 counties along the Gulf of Mexico.

The governor’s action allows agencies to “quickly deploy resources for the emergency response.”

“Texans believe in taking action and always being prepared in the event of an emergency,” Abbott said.

“That is why I am taking every precaution prior to … Harvey making landfall.”

(Learn More, courtesy of KRIS 6 News and YouTube)

Students and staff at the Texas A&M campus at Corpus Christi are under a mandatory evacuation order.

The campus will be closed starting Thursday, according to the university’s website.

People around Corpus Christi started stocking up Wednesday on food, bottled water and other essentials.

“We know that if anything as far as flooding happens, that’s the one thing everyone runs to, we have to have water,” Mariah Barter told CNN affiliate KZTV.

“It’s a big deal. It scares the hell out of people. It’s better to be prepared.”

Others in South Texas readied sandbags, fueled up power generators and bought plywood to board up their windows, CNN affiliate KRIS reported.

CNN’s Taylor Ward and Judson Jones contributed to this report.

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