Hur­ri­cane Hum­ber­to formed in the At­lantic Ocean but is not cur­rent­ly threat­en­ing land as the for­mer Hur­ri­cane Gabrielle passed Fri­day across the Azores, fore­cast­ers said.

Hum­ber­to is about 465 miles (750 kilo­me­tres) north­east of the north­ern Lee­ward Is­lands and is mov­ing slow­ly to­ward the north­west. It is ex­pect­ed to strength­en sub­stan­tial­ly over the week­end to be­come a ma­jor hur­ri­cane, the Mi­a­mi-based U.S. Na­tion­al Hur­ri­cane Cen­tre said.

Mean­while, Gabrielle is churn­ing as a post-trop­i­cal cy­clone near the Azores, where a hur­ri­cane watch was in force for the en­tire Por­tuguese arch­i­pel­ago. Fri­day morn­ing the storm was about 145 miles (230 kilo­me­tres) east-north­east of Fa­ial Is­land in the cen­tral Azores.