The trade winds usually refer to the winds closer to the equator.  The large-scale winds that affect California (leaving aside microclimates, like land-air breezes) are just simply "the westerlies."  El Nino tends to shift the westerlies/jet stream southward.  La Nina does the opposite.  Obviously we didn't see much of a southward shift this past winter, which is why northern CA/Pacific NW got doused and southern CA remained dry.   ENSO tends have its most significant impacts during the Northern Hemisphere winter/early spring, so any potential impact now is probably rather small and what you are seeing may have no known cause.