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Triple Threat of Storms Unleashes Severe Flash Flood Risk Across the Southern US

Forecasters said repeated heavy rain could drop up to 18 inches in isolated areas and put more than 15 million people at risk.

  • On Thursday, the National Weather Service warned of a weeklong "triple flood threat" endangering more than 15 million people across the Southwest toward the Great Lakes.
  • Forecasters attribute the widespread danger to moisture from Hurricane Polo and post-tropical system Odalys colliding with a Rocky Mountains storm, creating repeated downpours over ground already saturated by the North American Monsoon.
  • AccuWeather Meteorologist Brandon Buckingham reported rainfall rates reaching 3 inches per hour, while Governor Greg Abbott warned that stalling fronts could dump up to 20 inches of rain in Central Texas.
  • The Weather Prediction Center issued "a moderate risk" for "excessive rainfall" through the Texas Panhandle, as officials in Arizona and New Mexico urge drivers to avoid flooded roadways.
  • Meteorologists expect the flood risk to shift eastward later this week into the southern Plains and northern Mississippi Valley, with heavy rain potentially reaching Arkansas, Illinois, Indiana, Michigan, and Wisconsin by Friday.
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'Triple Flood Threat': Three-pronged flooding event puts millions of Americans at risk

A so-called "triple flood threat" is bringing life-threatening rainfall to millions of people this week as moisture and a western weather system converge.

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WBMA broke the news on Tuesday, September 29, 2026.
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