Meteorological history Tropical Storm Luke (1991)



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


an area of disturbed weather later become tropical storm luke first noted joint typhoon warning center (jtwc) on september 13. disturbance upgraded tropical depression japan meteorological agency (jma) following morning. disturbance tracked west-northwestward, passing near saipan improved upper-level anticyclonic outflow , falling surface pressures led issuance of tropical cyclone formation alert @ 11:30 utc on september 14. @ 18:00 utc, jtwc designated system tropical depression 20w, based on synoptic data indicated disturbance developed closed surface circulation. @ time of upgrade, depression s structure resembled of monsoon depression, ring of 55 km/h (35 mph) winds surrounding large area of light , variable winds, indicating broad , ill-defined circulation. on september 15, jtwc upgraded depression tropical storm luke, jma following suit 6 hours later.


the cyclone continued intensity on next 48 hours tracked west-northwestward. on september 17, satellite imagery indicated circulation had become less defined , overall system had lost organization. despite this, jtwc increased intensity of storm 95 km/h (60 mph), peak intensity. meanwhile, jma upgraded luke severe tropical storm. @ 18:00 utc, jma estimated luke reached peak intensity of 105 km/h (65 mph). luke turned north-northwestward, make turn east midtropospheric trough caused subtropical ridge, had been holding system westward track, receded eastward. meanwhile, vertical wind shear caused westerlies increased, causing luke transition extratropical cyclone. jtwc issued final warning @ noon on september 19, jma declaring luke extratropical evening. last noted late on september 21.





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