Typhoon Krovanh 2015 Pacific typhoon season
at same time when tropical storm vamco named, tropical disturbance monitored both jma , jtwc 806 km (500 mi) east of andersen air force base. jtwc issued tcfa on system later day. on september 14, jtwc upgraded system tropical depression, designating 20w. due increase of deep convection near center, both agencies upgraded 20w tropical storm krovanh next day. on september 16, krovanh showed signs of increasing organization. based on this, jma upgraded krovanh severe tropical storm. late on same day, microwave imagery showed tightly-curved bands wrapping well-defined microwave eye; subsequently, both agencies upgraded krovanh typhoon status. embedded in area of favorable environment wind shear diminishing, typhoon developed eye , became more symmetrical. jtwc estimates krovahn peaked intensity equal of category 3 typhoon. convective core started struggle due dry air on western periphery , krovanh moved in area of increasing vertical windshear, resulting in weakening trend. on september 19, both jma , jtwc downgraded krovanh severe tropical storm. on september 20, center of krovanh became exposed , jma later downgraded krovanh tropical storm. shortly thereafter, jtwc issued final warning. jma later issued final warning on krovanh on september 21, transitioned extratropical cyclone. extratropical remnants of krovanh lingered east of japan few days cyclonic loop before turning northeast.
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