Hurricane Harvey has strengthened to a Category 4 storm, as Texas is bracing for impact later Friday evening.

The storm, which has maximum sustained winds of 130 mph with even stronger gusts, is expected to be the worst to hit the state in decades. The last Category 4 storm to hit the U.S. was Charley in 2004 in Florida, while the last Category 4 storm to hit Texas was Carla in 1961.

Residents staying in the area frantically stocked up on food, water and gas, while others heading out of the storm’s path boarded up windows and doors of their homes and businesses.

Airlines canceled flights, schools were shuttered while concerts and other planned events in Houston and coastal cities were postponed.

Even after the hurricane hits the coast, its effects will linger for days, with heavy rainfall through next week estimated to be as high as 40 inches in some areas.

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“This is going to be a storm we talk about, unfortunately, for at least the next seven days,” ABC News Chief Meteorologist Ginger Zee said Friday on “ GMA .”

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Here’s what we know about the storm so far.

What’s ahead

As of 8 p.m. local time Friday, the hurricane was 35 miles away from the coastal city of Corpus Christi, Texas, with sustained winds of about 130 mph and stronger gusts. On the coast, sustained winds were reported to be 79 mph, with over 100 mph gusts.

The National Weather Service warned Harvey could bring a potentially devastating storm surge, heavy rainfall and wind hazards to the Lone Star State’s coast. A tornado watch is in effect for areas of southeastern Texas and southwest Louisiana.

Life-threatening storm surge waters could reach 9 to 13 feet above ground level. Catastrophic flooding is expected across parts of the area. And rainfall will be heavy, with an estimated 15 to 25 inches of rain falling in many areas and as high as 40 inches in some from today through Wednesday, the National Weather Service said.

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Here’s a projected timeline for Hurricane Harvey thus far, according to forecasts from the National Weather Service:

Friday through Saturday: Harvey is expected to roar ashore the Texas coast late Friday evening. After that, the storm’s path remains uncertain but it is forecast to meander near or just inland of the middle of the Texas coast through the weekend.

Sunday through Monday: Some forecast models show Harvey expanding across the Gulf Coast as it makes its way over southern Texas.

Tuesday through Wednesday: The hurricane could, according to some models, move northeast and then re-emerge briefly over the Gulf of Mexico before making a second landfall in northeastern Texas or western Louisiana.

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Preparation and evacuations

Storm preparation began in earnest on Wednesday and intensified on Thursday. Shoppers lined up to fill their carts with food and water, while lines for gas stretched out of many stations. Some people also got to work boarding up their homes and businesses to protect against the expected 100-plus mile per hour winds. Even the Texas Department of Transportation in Victoria boarded up its windows on Thursday.

As of Friday, governors had declared states of emergencies for 30 counties in Texas and statewide for Louisiana.

Corpus Christi resident Alex Garcia bought bottled water, bread and other basic grocery items in the Houston suburb of Sugar Land because they were likely more available there than back home, where stores were “crazy,” he told The Associated Press.

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And as Houston resident Bill Pennington prepared his one-story home for another deluge in the flood-prone city, the father told The Associated Press he comforted his nervous 9-year-old son by saying, “We know how to handle it. We’ll handle it again.”

AP

The Coast Guard said Thursday it was sending shallow-depth vessels to Texas and Louisiana that are capable of responding in flooded urban areas. And with gale force winds predicted to arrive within 24 hours, the Coast Guard on Thursday also ordered a nearly total closure of ports in Houston, Texas City, Galveston, Freeport and Corpus Christi.

By Friday afternoon, the Coast Guard had already completed its first search-and-rescue mission, rescuing 12 people from a 160-foot vessel near Port Mansfield, Texas.

Texas officials announced mandatory evacuations for all seven counties on the coast: Calhoun County, San Patricio County, Refugio County, Brazoria County, Jackson County, Victoria County and Matagorda County. In four of those countries, officials ordered their entire county to evacuate and warned those who chose to stay behind that their rescue could not be guaranteed. Voluntary evacuations have been urged for residents in other areas.

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Mandatory evacuations have been issued for Rockport, Texas, where Mayor Pro Tem Patrick Rios told reporters Friday, “We’re suggesting if people are going to stay here, mark there arm with a sharpie pen with their name and social security number.”

“It’s not something we like to do but it’s the reality; people don’t listen,” Rios added.

While a mandatory evacuation order is not in place for Corpus Christi, Mayor Joe McComb did advise residents to voluntarily evacuate.

Federal Emergency Management Agency Administrator Brock Long urged people in the path of the storm to heed warnings and to take evacuation orders seriously.

“This may be the first major landfall hurricane we’ve had since 2005,” Long said in an interview on “Good Morning America” Friday. “So there’s going to be damage.”

As of Friday morning, FEMA had amassed more than 96,000 liters of water, 306,000 meals and 4,500 tarps at incident support bases in Seguin and Fort Worth, Texas, as well as in Camp Beauregard, Louisiana, should the states need them.

Storm preparations have extended to New Orleans, where FEMA said it’s working to make sure the Louisiana city’s pumps are functioning in anticipation of the seven to 10 inches of rainfall expected there. The National Guard is also readying 500,000 sandbags, FEMA said.

More than 72,000 people have lost power in Corpus Christi as a result of Hurricane Harvey so far.

The Associated Press

How officials are responding

Politicians and officials have taken a proactive approach to the storm.

Texas Gov. Greg Abbott said Thursday night that he had discussed storm preparation with President Donald Trump, as well as with the heads of FEMA and the Department of Homeland Security. On Friday, Abbott sent a letter to Trump requesting a presidential disaster declaration in anticipation of Hurricane Harvey.

“Granting this request will provide Texans the additional resources needed to protect themselves, their property and rebuild their lives if necessary after Hurricane Harvey,” Abbott said in a statement.

However, White House Homeland Security Adviser Tom Bossert told reporters at a press briefing Friday afternoon that it’s unlikely the president will make that declaration prior to the storm making landfall.

White House press secretary Sarah Sanders said at the press briefing Friday afternoon that Trump is planning to visit Texas “early next week.”

Many state and local officials have urged residents to pay attention to evacuation orders, as it will be too late to leave once the storm hits.

Trump announced on Twitter late Friday that he had approved Abbott’s request for a disaster declaration in Texas, formally making federal funds and resources available to assist state recovery efforts.

Texas’ hurricane history

The storm is already being compared to Hurricane Bret, which hit Texas on Aug. 22, 1999. That storm made landfall in Kenedy County, just south of Corpus Christi, according to the National Weather Service — a path that was similar to the one forecast for Hurricane Harvey.