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Tropical Storm Omeka
Tropical Storm Omeka was the latest forming Eastern Pacific tropical storm since reliable records began in the 1960s. The storm was part of the 2010 Pacific typhoon and hurricane season. On December 18, 2010, the Central Pacific Hurricane Center (CPHC) began monitoring a subtropical cyclone near the International Dateline for possible tropical cyclogenesis. Over the following two days, the system tracked southwestward, entering the Western Pacific basin. It then began to transition into a tropical cyclone. Shortly before crossing the dateline on December 20, the CPHC assessed the system to have become a tropical storm. The storm was assigned the name Omeka several hours later as it moved into the CPHC's area of responsibility – which is from 140°W to the International Dateline. Upon doing so, Omeka attained its peak intensity with winds of 60 mph (100 km/h). Later on December 20, wind shear in the region increased, causing the system to weaken. By December 21, the center of Omeka was devoid of convection and dissipated on the next day. Omeka brushed Lisianski Island with no damage.
==Meteorological history==
The origins of Omeka were from an extratropical cyclone in the western Pacific Ocean. The storm tracked southeastward near the International Dateline, and by December 18 it transitioned into a kona storm and soon into a subtropical cyclone. A large, sprawling system, little development was initially expected to take place as the storm moved towards the southwest. As the low moved over warmer waters, the cyclone was able to maintain an area of deep convection near its center. According to the CPHC, the system was nearly fully tropical early on December 19 as it moved west of the dateline.〔 However, the Joint Typhoon Warning Center (JTWC) considered the low to be fully subtropical as a cold-core was present over the center of circulation. At this time, the storm had an eye-like feature, attained its peak strength with winds of 60 miles per hour (100 km/h) and a barometric pressure of .〔 Later on December 19, the Japan Meteorological Agency (JMA) classified the system as a tropical depression as the low turned towards the southeast. Early on December 20, the JMA issued their final advisory on the depression as it moved east of the dateline and reentered the CPHC's area of responsibility.〔
Already classifying it as a tropical storm, the Central Pacific Hurricane Center (CPHC) issued their first advisory on the system at 0900 UTC on December 20, at which time it was situated roughly 505 miles (815 km) south of Midway Island. Upon issuing this advisory, they designated the system as Tropical Storm Omeka, the first named storm of the Central Pacific season.〔 The storm generally tracked towards the northeast, in response to a mid-level low to the west, throughout the remainder of its existence. Traversing an area of decreased sea surface temperatures and increasing wind shear, Omeka quickly weakened to a minimal tropical storm later on December 20, with winds of 40 miles per hour (65 km/h).〔 Intermittent bursts of convection allowed the system to maintain gale-force winds through December 21; however, persistent shear finally took its toll later that morning. Between 0700 and 0800 UTC, Omeka brushed Lisianski Island.〔 Around 0900 UTC, the CPHC issued their final advisory on Omeka, as it transitioned into an extratropical cyclone roughly east-southeast of Midway Island, near Lisianski Island. The extratropical cyclone dissipated on December 23.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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