article_snippet: Some meteorologists, however, have warned that The PDO.
article_snippet: The PDO reached record levels in December last year and January this year, and should The PDO stay strong, The PDO may combine with an El Niño to increase global temperatures.
article_snippet: An associated slow-moving indicator of Pacific Ocean temperatures, called the Pacific Decadal Oscillation (PDO), reached record levels in December and January. '
article_snippet: A persistently strong PDO is associated with cold winters in the eastern US and drought in California –
article_snippet: Should A persistently strong PDO stay strong, A persistently strong PDO will essentially join forces with the El Niño and increase the odds that 2015 will rank as the warmest year on record globally.'