Rubuta ci gaba don wannan sakin layi - Yayin da yake tafiya a tsakiyar Tekun Caribbean, Janet ya kasance mafi girma fiye da lokacin da yake motsawa a kan Windward Islands, tare da iskar iska mai ƙarfi ta faɗaɗa daga tsakiyar ta Satumba 25. Kasancewa da guguwa mai lamba 4 yayin da yake motsawa ba bisa ƙa'ida ba zuwa yamma a cikin Caribbean, aikin jirgin sama na bincike a cikin daren Satumba 25<unk>26 ya nuna manyan guguwa tare da yawan tsawa da ido da aka bayyana, tabbacin cewa guguwar ta sake tsanantawa cikin sauri. Yayin da ta kusanci Yucatán Peninsula a ranar 26 ga Satumba, Janet ta fara hanzarta saurin gaba. Bayan da jirgin bincike "Snowcloud Five" ya ɓace yayin da yake shiga cikin idon guguwar, wani jirgin a farkon 27 ga Satumba ya ba da rahoton matsin lamba na, tare da iskar da ta wuce "ta babban adadin da ba za a iya lissafawa ba". An kiyasta cewa guguwar ta tsananta zuwa nau'in guguwa mai ƙarfi na 5 - mafi girman darajar akan sikelin guguwar Saffir-Simpson na zamani - a 1200 UTC a ranar 27 ga Satumba, yayin da yake yammacin Tekun Caribbean. Janet ta ci gaba da ƙaruwa bayan haka, a ƙarshe ta kai ga mafi girman ƙarfinta tare da iyakar iska mai ƙarfi na, tare da iskar iska mai ƙarfi da ta faɗaɗa zuwa aƙalla nesa da tsakiyar guguwar. Janet ta ci gaba da tsananin ƙarfi yayin da ta wuce Tsibirin Swan kafin ta sauka a kudancin kudancin Quintana Roo, Mexico, gabashin Chetumal, Mexico. A cikin wannan birni, barometer ya nuna mafi ƙarancin matsin lamba na barometric a cikin idon Janet. A lokacin, wannan shine matsin lamba na biyu mafi ƙanƙanta da aka taɓa yin rikodin a ƙasa a cikin guguwar Atlantic da ke sauka a ƙasa, a bayan guguwar Ranar Kwadago ta 1935, kodayake daga baya guguwar Dean ta wuce Janet
da Gilbert, wanda kuma ya sauka a kan Yucatan Peninsula a matsayin Category 5 hurricanes.