The National Hurricane Center says Hurricane Laura is expected to cause a massive storm surge, extreme winds and flash floods when it hits the US.
Laura was upgraded to a Category 4 storm as it approached the coasts of Texas and Louisiana on Wednesday.
The Hurricane Center warned residents to rush to complete preparations.
Half a million people have been told to leave.
Laura and another storm, Marco, earlier hit the Caribbean, killing 24 people.
Marco struck Louisiana, bringing strong winds and heavy rain on Monday.
Initially it was feared that both storms would hit Louisiana as hurricanes within 48 hours of each other - an unprecedented event - but Marco was downgraded to a tropical storm.
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