Flash Flood Risk Across Southwest and Plains
• A significant multiday flood event is unfolding across the Southwest, Southern Plains, and Midwest due to tropical moisture from Hurricane Polo and remnants of Odalys. NOAA's Weather Prediction Center has issued a Level 3 out of 4 flash flood risk for five consecutive days starting Monday, September 28,
• Flood Watches are in effect for nine states, including all of New Mexico, with rainfall totals expected to reach 6 to 8 inches or more in some areas. Heavy rain is already impacting southern California, Arizona, New Mexico, Utah, and Colorado, with localized amounts exceeding 2 inches. Vulnerable areas include burn scars, desert washes, and the Grand Canyon. The flood threat will expand eastward throughout the week, affecting up to 20 states.
Impact & Risks
The flash flooding poses a significant risk to communities across the Southwest and Plains, particularly in areas with burn scars, desert washes, and low-lying regions. Roads, including Highway 491 in New Mexico, have already been washed out. Rainfall rates could exceed 1 to 2 inches per hour, with localized totals surpassing 6 inches in the hardest-hit areas. Urban flooding, road closures, and potential evacuations are likely. The Grand Canyon and other national parks may face prolonged recovery efforts due to the heavy rainfall.
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