JMA ta tantance Mangkhut ya kai nau'in 5 daidai gwargwado a 12:00 UTC, ƙarfin da zai ci gaba da kusan kwanaki huɗu. JTWC ya yi nazarin Mangkhut ya kai nau'in 5 daidai gwargwado a 18:00 UTC, tare da iska mai ƙarfi na minti 10 mai gudana na 205 km / h (125 mph) da ƙananan matsin lamba na tsakiya na 905 mph (hmbar; 26.73 inHg). JTWC ya lura da ƙarin ƙarfi a ranar 12 ga Satumba, kuma ya kimanta Mangkhut ya kai kololuwar ƙarfin iska a ƙarfe 18:00 UTC, tare da iska mai ƙarfi na minti ɗaya mai gudana na 285 km / h (10 km / h) a cikin wannan lokacin.
905 da kuma