Supercharged El Niño drives record rainfall across the Southwest

Pacific Ocean waters are running hotter than normal, adding moisture to the atmosphere that is fueling severe storms in the American Southwest. Meteorologists identify this extreme iteration of the El Niño warming cycle as the primary driver behind recent flash floods and heavy precipitation in the region.

The current event is described by experts as particularly intense. Jeff Masters, a meteorologist with Yale Climate Connections, stated that while previous super El Niños have occurred, the current situation is a super duper El Niño. This natural cycle typically happens every few years, but scientists note that the latest version is just beginning and will likely persist for several more months.

The physical impact of the warming is already visible. More than 20 trillion gallons of water have fallen on the Four Corners states and Nevada in the past two weeks, according to calculations by Ryan Maue, a former chief scientist at the National Oceanic and Atmospheric Administration. This volume of water has overwhelmed local infrastructure, particularly in desert areas where the ground absorbs water slowly.

Recent weather events have forced action from local authorities. Flash floods on Sunday required evacuations in northern New Mexico and central Arizona. A ski town in Colorado prepared for its main river to reach catastrophic levels. These events follow a wet storm earlier in the week that subjected southwestern states to days of flooding.

Climate scientists explain that the El Niño is creating ideal conditions for heavy rain. It adds moisture to the air and shifts global wind patterns, directing strong air currents toward the Southwest. Daniel Swain, a climate scientist at the University of California Agriculture and Natural Resources, noted that while precipitation is common in the Southwest at this time of year, the current intensity has not been seen before.

Human-caused climate change is compounding the natural cycle. Oceans are warmer now than they were 100 years ago, which makes El Niño events more intense. Randy Cerveny, a meteorologist at Arizona State University, said that the baseline warmth of the ocean makes these specific weather situations more extreme. The phenomenon is also affecting weather globally, with record-breaking flooding reported in Peru and Ecuador and unusual dryness in parts of southeast Asia.

The El Niño is expected to peak in December. At that time, it will more strongly influence jet streams, potentially producing more extreme storms across the western U.S. Park Williams, a researcher at UC San Diego's Scripps Institution of Oceanography, stated in an email that the dice are certainly loaded for more heavy storms this winter and spring. The onslaught could continue for months after the peak.

Experts recommend that residents watch forecasts and heed evacuation warnings. Cerveny noted that the Pacific Ocean is not yet at its peak heating, so more of these particular events are expected. While El Niño can fill reservoirs and bring needed moisture to dry areas, the associated storms and floods pose dangers to people and property.