 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, and attained its peak strength with winds of 60 miles per hour (100 km / h) and a barometric pressure of 997 millibars (29.4 inHg). 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.
