Damaged houses and buildings following heavy storms in Louisiana. (Photo: VCG)

Texans have been warned to brace for tropical storm conditions late on Sunday through early Monday as Tropical Storm Beta lashes the coast with its outer bands.

Tropical Storm Beta, which is expected to make official landfall very late on Monday or early on Tuesday, is one of several storms creating a record-breaking Atlantic hurricane season.

Beta is already driving tropical storm conditions to parts of the southwestern Louisiana coast.

According to authorities in Texas, rainfall, flash flooding and isolated tornadoes may occur with little to no warning.

The National Hurricane Centre (NHC) urged people from Port Aransas, Texas, to the Rockefeller Wildlife Refuge in Louisiana to take extra caution as a storm surge warning was in effect from those areas.

"Persons located within these areas should take all necessary actions to protect life and property from rising water and the potential for other dangerous conditions," the NHC said.

Texas Governor Greg Abbott said: "We will continue to closely monitor the storm and work collaboratively with officials to ensure our fellow Texans are safe."

An NHC reconnaissance aircraft did not record any change in strength of the storm which, despite its slow pace, at 3 mph to the west-northwest, is still dangerous.

The storm is also battling a good amount of shear and dry air in the Gulf of Mexico which is keeping its intensity from increasing.

The Atlantic hurricane season officially runs from the beginning of June through the end of November.

This season has produced almost twice the average number of storms, with the average season producing 12 storms.