An unusually extended Pacific jet stream could bring larger swings between cool and warm weather to California in the coming weeks.

Add Yahoo as a preferred source to see more of our stories on Google. Forecast jet stream winds for next week. The colors show wind speed, with green, yellow and orange indicating the strongest winds.

The omega block is a weather term that describes the shape of the jet stream in the northern hemisphere: a curved upside-down "U" with two outward facing lines, which appears to resemble the 24th ...

A shift in the jet stream is forecast to drive a rapid swing from warm to cool temperatures across western Europe toward the end of this week. Unseasonably warm weather is expected first, with the jet ...