LISBON (Reuters) -Cyclone Gabrielle hit Portugal's mid-Atlantic Azores Islands on Friday with less intense winds and rains than expected, but still toppled trees and collapsed roofs, authorities said.

The storm, the first hurricane to strike the Portuguese islands in more than a decade, seemed not to cause significant damage.

As the Azores prepares for effects from Hurricane Gabrielle, the Atlantic Ocean wasted no time in creating another named storm: Humberto, which also may become a hurricane this weekend.

Portugal's Azores archipelago cancelled all tourist and recreational activities for 24 hours and shuttered schools and public services on Thursday, urging people to stay indoors ahead of the arrival of cyclone Gabrielle.

A hurricane warning was in effect for the volcanic archipelago which could experience dangerous conditions from Gabrielle as early as Thursday.

A fast-moving Hurricane Gabrielle is expected to bring heavy rain, high winds and a storm surge to the Azores islands. The National Hurricane Center in Miami says a hurricane warning is in effect

A Hurricane Warning has been issued for the Azores as Hurricane Gabrielle continues to barrel across the Atlantic.

While Hurricane Humberto continues to strengthen out in the Atlantic Ocean, it's not the storm that poses the most danger to U.S. shores. Hurricane forecasts have some caveats that might not appear on a graphic,