Meteorological history Tropical Storm Winona (1990)

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


tropical storm winona originated monsoon trough displaced 550 km (340 mi) north of climatological position. area of enhanced convection developed within monsoon trough in east china sea around 00:00 utc on august 4. 6 hours later, joint typhoon warning center (jtwc) started tracking system weak low-pressure area developed. @ 18:00 utc, japan meteorological agency (jma) classified system tropical depression. @ first, strong wind shear left center north of persistent convection. following dvorak classification of t1.0/50 km/h (30 mph), jtwc issued tropical cyclone formation alert (tcfa) @ 11:00 utc on august 5. twenty 4 hours later, jtwc started issuing warnings on system, designating system tropical depression, after system s convection structure improved , thunderstorm activity increased in coverage. depression moved northeast, skirting past southern tip of kyushu, turn southeast under influence of monsoonal flow. on evening of august 6, jma upgraded depression tropical storm.


winona in between 2 subtropical ridges – 1 in luzon strait , 1 south of tropical storm vernon. on august 7, jtwc upgraded system tropical storm, naming winona. wind shear began relax; consequently, storm s low-level center moved under deep convection. 00:00 utc on august 8, winona abruptly turned north in response building ridge southeast. strengthening aided development of dual upper-level outflow channels. on august 8, jma reported winona strengthened severe tropical storm. time, winona expected both agencies move on northeastern japan, winona tracked further south predicted, maintaining northward course in direction of japan. @ noon on august 9, jma estimated winona peaked in intensity winds of 115 km/h (70 mph) , barometric pressure of 975 mbar (28.8 inhg). meanwhile, jtwc upgraded winona typhoon, simultaneously, agency estimated typhoon in peak intensity, winds of 120 km/h (75 mph) on 330 km (205 mi) east-southeast of tokyo. on august 10, winona made landfall close hamamatsu near peak intensity. after landfall, began accelerate northeastward , 12:00 utc, winona embedded in mid-latitude westerlies , started transition extratropical cyclone. eighteen hours later, @ 06:00 utc on august 11, jma declared winona extratropical cyclone; jtwc followed suit several hours later. on august 14, winona ceased tracking system.





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