MIAMI — Tropical Storm Humberto formed in the Atlantic Ocean on Wednesday at the same time Hurricane Gabrielle was racing across the ocean toward the Azores islands, forecasters said.

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 Center said.

The 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 5 inches (13 centimeters) of rain across the central and western Azores.

In the Northern Atlantic, Gabrielle was about 855 miles (1,375 kilometers) west of the Azores late Wednesday. It had maximum sustained winds of

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