Washington: Hurricane Nate has made landfall near the mouth of the Mississippi river in Louisiana, the US National Hurricane Center (NHC) said.

The storm, with maximum sustained winds of 137 kmph, is moving north, and a second landfall is expected on the Mississippi coast later, BBC reported on Sunday.

Louisiana, Mississippi, Alabama and parts of Florida have issued hurricane warnings and evacuation orders.

Nate killed at least 13 people in Nicaragua, eight in Costa Rica, three in Honduras and one in El Salvador.

The tropical storm has since strengthened and is now a category one hurricane on the Saffir-Simpson scale.

Although not as strong as last month's Maria and Irma, Nate is expected to bring strong winds and storm surges.

US President Donald Trump had earlier issued an emergency declaration for Louisiana, allowing the state to seek federal help with preparation and possible relief efforts.

Nate caused heavy rains, landslides and floods which blocked roads, destroyed bridges and damaged houses as it tore through central America.

The tail of the storm is still causing problems in the region, where thousands have been forced to sleep in shelters and some 400,000 people in Costa Rica were reported to be without running water.