Meteorological history Typhoon Abby (1986)

map plotting track , intensity of storm, according saffir–simpson scale

during late august , september 1986, western pacific monsoon trough became displaced east. lower normal pressures favored building of convection on trough. evening of september 9, pronounced area of disturbed weather developed southwest of truk atoll. aided low wind shear, disturbance developed slowly, though hurricane hunters failed find well-defined center. disturbance drifted towards northwest, , on september 12, japan meteorological agency (jma) started monitoring system. based on ship reports, joint typhoon warning center (jtwc) classified system tropical depression @ 06:00 utc on september 13. both jma , jtwc upgraded depression tropical storm abby @ 00:00 utc on september 14.

on september 14, abby, while moving west-northwest, began develop central dense overcast , began intensify. on morning of september 15, jma upgraded system severe tropical storm. despite reports hurricane hunter aircraft indicating low-and upper-level circulations not aligned, both jtwc , jma estimated abby became typhoon on september 16.

at 06:00 utc on september 18, jma reported abby attained maximum intensity of 160 km/h (100 mph). 6 hours later, jtwc estimated abby reached peak intensity of 175 km/h (110 mph). moving northwest, storm weakened before making landfall in eastern portion of taiwan on september 19; jtwc estimated winds of 170 km/h (105 mph) @ time of landfall. due land interaction, storm rapidly weakened, low-level center re-curving towards northeast. @ 00:00 utc on september 20, jma estimated abby weakened below typhoon intensity. twelve hours later, jtwc stopped monitoring system while located 410 km (255 mi) southeast of shanghai. around time, jma reported abby transitioned extratropical cyclone, although jma continued track system through morning hours of september 24.

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