The cold California current runs southward from the Gulf of Alaska, and the warm Gulf Stream runs northward from the Gulf of Mexico. I do not know if the currents that affect Hawaii have names, but it is in the center of the northern Pacific Ocean, so the currents are probably fairly weak. The California current in Alaska itself comes from the warm Japan Current that comes north from Indonesia, but by the time it reaches Alaska it has become cold. There is one more current that runs through the Arctic Ocean that circles the pole and thus hits northern Alaska; this current is coming from the White Sea north of Siberia.