Mezue ahịrịokwu na-esonụ: N'ihe dị ka 1200 UTC na Nọvemba 7, Haiyan ruru oke ike ya na ifufe na-aga n'ihu na-aga n'ihu na nkeji iri nke 895 mbar (hPa; ). Nke a mere ka ọ bụrụ oke ifufe nke abụọ kachasị ike na Northwest Pacific Ocean na ndekọ, dabere na ọsọ nke ifufe naanị, yana Bess na 1982 na Megi na 2010, naanị mgbe
Ntụziaka na 1979. Mgbe awa isii gachara, JTWC kwuru na Haiyan nwere oke ifufe nke ruru otu nkeji. Nke a jikọtara Haiyan na Ajọ Ifufe Meranti n'afọ 2016 dịka oke ifufe nke ise kachasị ike na ndekọ na ọsọ nke ifufe, naanị Ajọ Ifufe Ida (325 km / h) na 1958, Ajọ Ifufe Violet (335 km / h) na 1961, Ajọ Ifufe Nancy (345 km / h) na 1961 na Ajọ Ifufe Patricia (345 km / h) na 2015. Otú ọ dị, n'ihi eziokwu ahụ bụ na ihe ndekọ ifufe na typhoons dị elu n'ụzọ na-ezighi ezi n'oge 1950s na 1960s, enwere ike ikwu na Haiyan mere ụzọ ya dị ka ajọ ifufe nke abụọ kachasị ike na ndekọ, nke abụọ na Hurricane Patricia na 2015. (Otú ọ dị, ọ dị mkpa iburu n'uche na ụgbọelu ndị na-achụ nta ifufe Patricia tụrụ ifufe Patricia ozugbo, ihe ndị a na-ahụ anya adịghị maka Haiyan, yabụ ndekọ ahụ edoghị anya na iji tụnyere ike nke oké ifufe abụọ ahụ bụ nsogbu.) Oké ifufe ahụ gosipụtara ụfọdụ njirimara nke oke ifufe na-ekpo ọkụ, ọ bụ ezie na eriri convective siri ike ka dị n'akụkụ ọdịda anyanwụ nke usoro ahụ.