Rubuta ci gaba don wannan sakin layi - A kusa da 1200 UTC a ranar 7 ga Nuwamba, Haiyan ya kai mafi girman ƙarfinsa tare da iska mai tsawo na minti goma da kuma matsin lamba na 895 mbar (hPa; ). Wannan ya sa ya zama na biyu mafi tsananin guguwa mai zafi a Arewa maso Yammacin Tekun Pacific a cikin rikodin, bisa ga saurin iska kawai, tare da Bess a 1982 da Megi a 2010, bayan Tip.
a shekarar 1979. Sa'o'i shida bayan haka, JTWC ta kiyasta Haiyan ta sami iska mai ci gaba da minti daya da kuma gusts har zuwa. Wannan hukuma ta danganta Haiyan da Guguwar Meranti a cikin 2016 a matsayin guguwar guguwa ta biyar mafi ƙarfi a cikin rikodin dangane da saurin iska, wanda Guguwar Ida (325 km / h) a cikin 1958, Guguwar Violet (335 km / h) a cikin 1961, Guguwar Nancy (345 km / h) a cikin 1961 da Guguwar Patricia (345 km / h) a cikin 2015. Koyaya, saboda gaskiyar cewa rikodin iska a cikin guguwa sun yi kuskure sosai a cikin shekarun 1950 da 1960, ana iya cewa Haiyan ya yi hanyarsa a matsayin na biyu mafi ƙarfi guguwa mai zafi a cikin rikodin, na biyu kawai ga Hurricane Patricia a cikin 2015. (Yana da muhimmanci a lura, duk da haka, cewa iska ta Patricia ta kai tsaye ta hanyar jirgin sama na jirgin sama, abubuwan da ba a samu ba don Haiyan, don haka rikodin ba shi da tabbas kuma kwatanta ƙarfin guguwa biyu yana da matsala.) Guguwar ta nuna wasu halaye na cyclone na wurare masu zafi, kodayake ƙungiyar haɗuwa mai ƙarfi ta kasance a gefen yamma na tsarin.