Mr. Abbott stated the cities of Houston and Corpus Christi had already acquired as an awful lot as 20in (50cm) of rain.
He stated another 40in of rain could be due before the hurricane subsides midweek.
Rescue efforts are being hampered by sturdy winds and heaps are with out electricity. A single loss of life has to date been confirmed in the city of Rockport.
Houston, the fourth largest metropolis inside the US, could see 2in-3in (5cm-7.5cm) of a rain an hour on Saturday night time, Mayor Sylvester Turner said.
About 4,500 inmates from prisons south of Houston are being evacuated to other prisons in east Texas because the Brazos River nearby is growing significantly, officers say.
Harvey batters Texas
Damage to a -story rental building after Hurricane Harvey hit Rockport,
Rockport has now not been destroyed by means of the storm however it is in awful form
Texas Governor Greg Abbott
Texas Governor Greg Abbott has warned that flooding in the kingdom isn’t always going to disappear overnight
Harvey started as a main category four typhoon – the first to make landfall in the US in 12 years – before it becomes downgraded to a tropical hurricane afterward Saturday.
Mr. Abbott warned of the “potential for terribly dramatic flooding” from the hurricane while expanding an announcement of emergency in the kingdom from 30 countries to 50.
He has mobilized 1,800 army personnel to assist with rescue and restore operations.
Forecasts say that as much as 40in (1m) of rain may want to fall in a few areas of the center and top Texas coast, the hurricane center (NHC) warned. Such precipitation could trigger flooding in low-lying areas and close to water outlets and rivers.
The National Weather Service cautioned that the typhoon became so excessive that many areas could be uninhabitable for months.
Media captions BBC’s James Cook is in Rockport, which bore the brunt of the typhoon
The BBC’s James Cook in Rockport
In the wreckage of Rockport, locals are the first responders.
Residents had been going door-to-door checking to look if their neighbors are dead or alive.
The little city has no longer been destroyed but it’s far in awful shape, especially within the poorer quarters in which trailer houses were smashed open through the wind.
Debris is trailing from the tops of bushes and on the porch of 1 modest belongings, a rain-sodden American flag lies on the ground: a touch of pink, white and blue amid the inexperienced leaves of fallen timber.
Most human beings seem to have were given out simply in time with many leaving best at the final minute as the overall power of the typhoon became clear.
The typhoon has now typically moved inland, officials say, with several locations already pronounced to have received properly over 10in of rain.
But coastal areas will also be flooded by typhoon surges all through the excessive tide, the NHC said.
Damage to a store after Hurricane Harvey hit Rockport
Some Rockport citizens lost both their houses and their furnishings and belongings
Damage to the First Baptist Church of Rockport after Hurricane
Many buildings inside the path of the storm – along with this church – had been badly damaged
Meteorologist Wendy Wong informed the Houston Chronicle that at least seven tornadoes which stemmed from the typhoon had struck the Houston place between Friday night and Saturday afternoon flooding in california today
The tornadoes destroyed homes and houses and are probably to keep in the course of Sunday and Monday.
Earlier, Harvey made a double landfall: north-east of the metropolis of Corpus Christi to start with the past due on Friday neighborhood time, then simply north of Rockport some hours later.
When the storm struck close to Corpus Christi it had winds of as much as 130mph (215km/h), but through 18:00 GMT its sustained winds had dropped to 70mph – therefore turning into a tropical storm.
It became moving at an incredibly low pace – 2mph.
The port of Corpus Christi – which closed on Thursday in education for the hurricane – handiest obtained “minor damage”. Its navigation channel is because of reopening after a survey is finished by using engineers.
Texas City also expects to open its port within 48 hours.
Map displaying the course of the storm
Utility businesses say almost 300,000 clients had been without energy.
President Donald Trump has freed up federal useful resource for the worst-affected regions and Governor Abbott praised the administration for “stepping up”.
In a teleconference with cupboard participants Mr. Trump “emphasized his expectancies that all departments and organizations live fully engaged and located to support his number one precedence of saving lives”, the White House stated.
At least 18 people were rescued from vessels in misery through Coast Guard helicopters. ABC News has tweeted a video of 4 human beings being rescued off the coast of Port Aransas.
Rockport, usually home to about 10,000 human beings, seems to have been the hardest hit city.
Celina Martinez returns to locate their own family domestic badly damaged after Hurricane Harvey hit Rockport
Families are grow returning to their flooding houses in Harvey
Tornadoes have destroyed homes and houses and are possible to preserve for the duration of Sunday and Monday
Travis Pettis, a reporter with the Caller Times newspaper in Corpus Christi, advised the BBC that robust winds whilst the hurricane arrived made the rain experience like “needles”.
Trees came down inside the town and power substances were cut, but lots of residents had heeded warnings and boarded up their houses earlier than fleeing.
Media caption tornadoes precipitated a lot of damage as the hurricane made landfall
Port Aransas, a city on Mustang Island, near Corpus Christi, is also suggested to have huge damage. Local media reviews say a search and rescue operation is under way at a trailer park.
Animated manual: Hurricanes
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Harvey is the first predominant hurricane of the Atlantic storm season. It is forecast to meander throughout south-east Texas till Wednesday.
Mr. Trump is probably to visit Texas early subsequent week, the White House stated.
The typhoon is the strongest to hit the US considering the fact that Charley in August 2004 and the most effective to hit Texas due to the fact that Hurricane Carla in 1961, which killed 34 human beings, according to the Houston Chronicle.