I have been tracking oceanic temperatures against rainfall levels on the Central Coast of California for ten years. I can tell you for a fact that although El Nino events may correlate with increased rainfall in California when averaged over many years, there is zero predictive value when it comes to any particular year. The correlation numbers I have calculated are very low.
Oh, the government just says stuff. There’s no real expectation that any of it is backed up by facts.
When you live in the west (as I know you do), rain is like money, it doesn’t exist until it’s in your pocket.