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 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, and attained its peak strength with winds of 60 miles per hour and a barometric pressure of. Later on December 19, the Japan Meteorological Agency 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 issued their first advisory on the system at 0900 UTC on December 20, at which time it was situated roughly 505 miles 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. 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. Omeka's extratropical remnant dissipated on December 23.
Impact and records
On December 21, the center of Omeka brushed Lisianski Island, with winds of 40 miles per hour. However, no tropical storm watches or warnings were issued since the CPHC anticipated weakening prior to the storm passing the island. On December 20, Omeka crossed the International Dateline into the northeast Pacific, becoming the first tropical cyclone to do so since Tropical Storm Wene in 2000, At the time, Omeka was judged to have existed in the northeast Pacific later than any other storm since the 1960s, when reliable records begin in the basin. However, according to the CPHC's database, there are two possible tropical cyclones in 1903 and 1904 which developed on December 23. In addition, even though it did not strengthen into a tropical storm, Tropical Depression Nine-C of the 2015 Pacific hurricane season formed later in the calendar year than Omeka, forming on December 31, 2015 and dissipating the next day. Omeka was the first December storm in the Central Pacific since Tropical Storm Paka in 1997. Throughout 2010, the entire Pacific Ocean experienced record-low tropical cyclone activity due to a strong La Niña. Since Omeka was the first storm in the Central Pacific during the year, it marked the latest start to a season since reliable records began, excluding seasons with no storms.
