Turning streets to rivers, Sally was the second hurricane to hit the US Gulf Coast in less than three weeks and the latest to blow during one of the busiest hurricane seasons ever.
At least 14 people have been killed after the hurricane flooded streets, submerging or destroying buildings, leaving more than 600,000 homes without power in Louisiana and neighbouring Texas.
The last time two tropical storms were in the Gulf together was in 1959
Pair of cyclones forecast to become hurricanes early headed for US Gulf Coast and will spin over Gulf's warm waters simultaneously, in rare weather event.
Isaias causes its first casualty in North Carolina as it ravages the Northeast and knocks out power to hundreds of thousands and threatens to trigger tornadoes.
Isaias is expected to remain a hurricane through Monday, then slow weaken on its climb up the Atlantic seaboard.
Violent downpours in October have displaced tens of thousands in Somalia, submerged whole towns in South Sudan and killed dozens in flash floods and landslides in Kenya, Ethiopia and Tanzania.
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