Ka cika wannan magana: A ranar 4 ga Satumba, bayan da ta shiga yanayi mai kyau, Irma ta yi ƙarfi ta zama guguwa mai ƙarfi. Yayin da ya ci gaba da kusantar Tsibirin Leeward, Irma ya sami lokaci na biyu kuma mafi ƙarfi na saurin haɓaka, ya zama guguwa ta 5 ta 12:00 UTC a rana mai zuwa, tare da iskar 175 mph (280 km / h). Hurricane mai karfin gaske ya ci gaba da tsanantawa, tare da iskar da ke ci gaba da hauhawa a 180 mph (285 km / h) kusa da 18:00 UTC a ranar 5 ga Satumba. Irma ta sami halaye na zobba a wannan lokacin, tare da guguwar da ke nuna babban, CDO mai daidaituwa da kuma bayyanar tauraron dan adam mai ban sha'awa. Irma ya ci gaba da ƙaruwa yayin da yake kusantar tsibirin Leeward na arewa. Kusan sa'o'i takwas bayan haka, a kusa da 05:45 UTC a ranar 6 ga Satumba, Irma ya sauka a gabar tekun arewacin Barbuda a mafi girman ƙarfi, tare da matsin lamba mafi ƙanƙanci na guguwar da ya sauka a <unk> wannan shine mafi ƙanƙanta a cikin Atlantic tun
Dean a shekara ta 2007; guguwar kuma ta sauka a bakin teku tare da iskar da ta kai 180 mph (285 km / h). Irma ya ci gaba da kula da iyakar ƙarfinsa har zuwa 12:00 UTC a ranar 6 ga Satumba kuma ya yi ƙarin abubuwan da suka faru a wannan rana, a 11:15 UTC a Sint Maarten, kuma a 16:30 UTC a Virgin Gorda, a cikin British Virgin Islands, kodayake matsin lamba na tsakiyar guguwar ya tashi kadan kafin ta uku.