Right now, the leaning-edge of a Kelvin Wave shifting through the eastern equatorial Pacific during the past few weeks has weakened just before reaching the northwest coast of South America. A new Kelvin Wave has strengthened and shifted just east of the Dateline. A westerly wind burst associated with the new Kelvin Wave is present just west of the Dateline.

A transition into moderate-to-strong negative phase Pacific North America (-PNA) index develops later this week and lasts through the remainder of February and may continue in March. The -PNA shifts the focus of U.S. weather hazards from cold to stormy.