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El Niño Adds to Flood Risk in Southwest, but Does Not Explain Every Storm

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Flooding and evacuations across parts of the Southwest have renewed questions about how much this year’s developing El Niño is shaping storms. Climate scientists say the ocean pattern can increase moisture and shift storm tracks, but it is not the only cause.

Recent storms brought heavy rain to northern Arizona and central New Mexico. Officials ordered evacuations in some communities as flash flooding threatened homes, roads and waterways after a prolonged dry period.

A meteorologist estimated that more than 20 trillion gallons of rain fell over the Four Corners region and Nevada across roughly two weeks. Broad totals describe the scale but do not predict local damage by themselves.

El Niño changes ocean temperatures in the tropical Pacific and can influence winds and moisture across North America. Its effects vary by region and season, and individual storms still depend on local weather conditions.

Scientists caution against saying El Niño alone caused the flooding. Warmer background temperatures can increase atmospheric moisture, while terrain, soil conditions and storm placement affect how rain becomes runoff.

Forecasters expect the El Niño pattern to strengthen toward a peak around December. Its influence can continue for months, but the exact effects depend on how it develops and interacts with other weather systems.

Communities facing flash-flood risk should follow local emergency alerts and National Weather Service warnings. Floodwater can rise quickly, carry debris and conceal damaged roads, making it dangerous to drive or walk through.

The flooding shows why attribution requires care: climate patterns change probabilities and conditions, while no single factor explains the whole event. Scientists will compare observations with long-term records as the season progresses.

Sources

AP: https://baynews9.com/fl/tampa/ap-top-news/2026/11/02/is-el-nio-making-storms-and-flash-floods-in-the-southwest-worse
National Weather Service: https://www.weather.gov/
NOAA Climate Prediction Center: https://www.cpc.ncep.noaa.gov/products/analysis_monitoring/enso_advisory/

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