 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.