“Don’t count it out yet,” Klaus Wolter, a research scientist at CU Boulder and the National Oceanic Atmospheric Association’s Earth System Research Laboratory, told me recently. It was a warm April day in Boulder, Colorado, where the lab is located, and Wolter, an El Niño expert wearing a short-sleeve floral print shirt, seemed excited for the change of season. We were on our way to the “War Room”—an otherwise innocuous conference room save for the large screen on the wall featuring various spinning, crimson-splashed El Niño weather models.