The U.S. government is closed. This site will not be updated; however, NOAA websites and social media channels necessary to protect lives and property will be maintained. To learn more, visit This Tropical Weather Phenomenon Can Have a Big Influence on California Rain and Snow, But Key Connections Remain a Mystery
...Which is a way of saying: a lot of people ask what it takes to make it rain in California, and the answer relies on a bewildering variety of inputs, some of them very complex and very far away. One of the most intriguing, and least understood, is a weather phenomenon called the Madden-Julian Oscillation, or MJO. Chidong Zhang is featured.
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