Kammala wannan jumla: Guguwar Bavi, da aka sani a Philippines a matsayin Guguwar Betty, ta rinjayi iska mai cin gashin kanta a kan Tekun Pacific kuma ta kasance wani ɓangare na alhakin daya daga cikin manyan juyin juya halin iska mai cin gashin kanta da aka taɓa gani. An fara lura da tsarin a matsayin rikicewar yanayin zafi a ranar 8 ga Maris, 2015, yayin da yake kudu maso gabashin Kwajalein Atoll a tsibirin Marshall. A cikin kwanaki biyu masu zuwa tsarin ya koma arewa maso yamma ta tsibirin Marshall, kafin a rarraba shi a matsayin matsin lamba na wurare masu zafi a ranar 10 ga Maris. Daga nan sai tsarin ya koma arewa maso yamma kuma ya ci gaba da bunkasa, kafin a sanya shi a matsayin guguwa ta uku na yankin.
2015 Pacific typhoon kakar kuma mai suna Bavi da Japan Meteorological Agency (JMA) a lokacin Maris 11. Bayan ci gaba da motsi zuwa arewa maso yamma, tsarin ya kai matsayin guguwar wurare masu zafi a ranar 14 ga Maris, kafin ya fara raunana yayin da ya kusanci tsibirin Mariana. Daga baya tsarin ya wuce Guam a rana mai zuwa, kafin ya ci gaba da yamma- arewa maso yammacin motsi kamar yadda ya raunana a hankali a cikin 'yan kwanaki masu zuwa. Tsarin ya shiga yankin Philippine na alhakin, inda PAGASA ta kira shi Betty a ranar 17 ga Maris yayin da tsarin ya raunana zuwa matsin lamba. Daga baya an lura da tsarin a ranar 21 ga Maris, yayin da ya watse a kan Philippines.