Rubuta ci gaba don wannan sakin layi - A yammacin ranar 5 ga Oktoba, Nora ya sami iskar da ta wuce, wanda ya sanya shi a matsayin rukuni na 5 daidai da babban guguwa a kan sikelin guguwar Saffir-Simpson. Wani aikin bincike a cikin guguwa a wannan lokacin ya bayyana ido mai ido, wanda aka auna a. Da farko, jirgin sama bai iya shiga cikin zuciyar ido ba saboda tsananin tashin hankali; duk da haka, sun yi nasara bayan ƙoƙari na biyu. Sa'ad da suka shiga cikin idon, sun gano wani wuri da babu gajimare kuma "kamar filin wasa ne ko kuma kwano". Stratocumulus girgije da aka suppressed zuwa wani unusually low tsawo na. Core na Nora ya kasance mai zafi sosai, tare da yanayin zafi ya kai kusan rikodin a matakin 700 mb. A 0020 UTC a ranar 6 ga Oktoba, wani dropsonde da ƙungiyar bincike suka saki ya yi rikodin matsin lamba na 877 mb (hPa; 25.91 inHg) kawai a cikin ido na guguwa. A wannan lokacin, an kiyasta iyakar iskar da ta kai. Wannan ƙarfin ya sanya Nora a matsayin mafi yawan guguwa mai zafi a duniya, tare da Typhoon Ida a shekarar 1958. Koyaya, a cikin binciken bayan guguwar, an lura cewa tunda dropsonde bai yi rikodin matsin lamba a tsakiyar guguwar ba, mai yiwuwa Nora ya ɗan fi ƙarfin da aka nuna. Tun daga wannan lokacin, wasu guguwa uku sun zarce ƙarfin Nora: Guguwar Yuni a shekara ta 1975, Guguwar Tip
a shekarar 1979, da kuma guguwar Patricia a shekarar 2015.