Tropical Storm Humberto has formed in the Atlantic Ocean at the same time Hurricane Gabrielle is racing across the ocean toward the Azores islands, US forecasters say.

A hurricane warning was in effect for the volcanic archipelago which could experience dangerous conditions from Gabrielle as early as Thursday, the Miami-based National Hurricane Centre said.

The Category 2 storm is forecast to weaken but could cause significant coastal flooding in the island chain as well as large, destructive waves, forecasters said.

From Thursday into Friday, Gabrielle may bring up to 13 centimetres of rain across the central and western Azores.

In the Northern Atlantic, Gabrielle was centred about 1,625 kilometres west of the Azores on Wednesday afternoon. It had maximum sustained winds of 160 km/h a

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