Mezue nkebi ahịrịokwu a: Alaska nwere ụlọ ọkụ kasị dị n'ebe ugwu na nke kasị dị n'ebe ọdịda anyanwụ United States, nweekwa ụfọdụ n'ime ndị kasị dịpụrụ adịpụ. A naghị ekwe ka ndị na-elekọta Cape Sarichef na Scotch Cap Lights na Unimak Island na Aleutians kpọbata ezinụlọ ha n'ọdụ ụgbọ ahụ, wee jee ozi afọ anọ tupu ha enweta ezumike afọ niile; Cape Sarichef anataghị ihe ọ bụla site na August 1912 ruo June 1913, ma mechie ọkụ abụọ ahụ n'oge oyi n'ihi ice ice. Scotch Cap bụkwa ebe ọdachi ụlọ ọkụ kacha njọ mere n'akụkọ ihe mere eme nke United States, mgbe ala ọma jijiji bibiri ya na
1946 Ala ọma jijiji nke Aleutian Islands, na-egbu ndị ọrụ nche mmiri ise niile nọ ebe ahụ.