page_title: Tropical Storm Winona (1990)
section_title: Meteorological history
hierarchical_section_title: Tropical Storm Winona (1990) / Meteorological history
caption_attribution_description: English: Track map of Typhoon Winona of the 1990 Pacific typhoon season. The points show the location of the storm at 6-hour intervals. The colour represents the storm's maximum sustained wind speeds as classified in the Saffir-Simpson Hurricane Scale (see below), and the shape of the data points represent the nature of the storm, according to the legend below. Saffir–Simpson hurricane wind scale Tropical depression≤38 mph≤62 km/h Category 3111–129 mph178–208 km/h Tropical storm39–73 mph63–118 km/h Category 4130–156 mph209–251 km/h Category 174–95 mph119–153 km/h Category 5≥157 mph≥252 km/h Category 296–110 mph154–177 km/h Unknown Storm typeTropical cycloneSubtropical cycloneExtratropical cyclone / Remnant low / Tropical disturbance
context_page_description: Tropical Storm Winona struck Japan during August 1990. An area of disturbed weather developed within the monsoon trough, located over the East China Sea, on August 4. Despite the presence of strong wind shear, a tropical depression developed later that day. The depression initially tracked northeast, bypassing the southern tip of Kyushu. Thereafter, the depression turned southeast, and on August 6, was believed to have obtained tropical storm intensity. In response to a building subtropical ridge to its southeast, Winona veered north while gradually intensifying. On August 9, Winona peaked in intensity, and while near peak intensity, made landfall in Shizuoka Prefecture early the following morning. Winona transitioned into an extratropical cyclone on August 11, and was last observed on August 14.
  The tropical storm lashed the Japanese archipelago with heavy rains, strong winds, and waves up to 7.9 m high. More than 60 scheduled domestic air flights between Tokyo and western Japan were delayed or cancelled. Inter-island ferry service was suspended due to the storm. A total of 110 trains were cancelled or delayed, which led to 250,000 stranded passengers.
context_section_description: Tropical Storm Winona originated from a monsoon trough that was displaced 550 km (340 mi) north of its climatological position. An area of enhanced convection developed within the monsoon trough in the East China Sea around 00:00 UTC on August 4. Six hours later, the Joint Typhoon Warning Center (JTWC) started tracking the system as a weak low-pressure area developed. At 18:00 UTC, the Japan Meteorological Agency (JMA) classified the system as a tropical depression. Initially, strong wind shear left the center to the north of persistent convection. Following a Dvorak classification of T1.0/50 km/h (30 mph), the JTWC issued a Tropical Cyclone Formation Alert (TCFA) at 11:00 UTC on August 5. Twenty four hours later, the JTWC started issuing warnings on the system, designating the system as a tropical depression, after the system's convection structure improved and thunderstorm activity increased in coverage. The depression initially moved northeast, skirting past the southern tip of Kyushu, only to turn southeast under the influence of the monsoonal flow. On the evening of August 6, the JMA upgraded the depression into a tropical storm.
  Winona was in between two subtropical ridges – one in the Luzon Strait and one south of Tropical Storm Vernon. Early on August 7, the JTWC upgraded the system into a tropical storm, naming it Winona. Wind shear began to relax; consequently, the storm's low-level center moved under the deep convection. By 00:00 UTC on August 8, Winona abruptly turned north in response to a building ridge to its southeast. Strengthening was aided by the development of dual upper-level outflow channels. Early on August 8, the JMA reported that Winona strengthened into a severe tropical storm. By this time, Winona was expected by both agencies to move over northeastern Japan, but Winona tracked further south than predicted, maintaining a northward course in the direction of Japan. At noon on August 9, the JMA estimated that Winona peaked in intensity with winds of 115 km/h (70 mph) and a barometric pressure of 975 mbar (28.8 inHg). Meanwhile, the JTWC upgraded Winona into a typhoon; simultaneously, the agency estimated that the typhoon reached peak intensity, with winds of 120 km/h (75 mph) over 330 km (205 mi) east-southeast of Tokyo. Early on August 10, Winona made landfall close to Hamamatsu near peak intensity. After landfall, it began to accelerate northeastward and by 12:00 UTC, Winona was embedded in the mid-latitude westerlies and started a transition into an extratropical cyclone. Eighteen hours later, at 06:00 UTC on August 11, the JMA declared Winona an extratropical cyclone; the JTWC followed suit several hours later. On August 14, the JMA ceased tracking the system.
caption: Map plotting the track and the intensity of the storm, according to the Saffir–Simpson scale
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