Strong El Niño May Bring Rain, Yet Lake Mead Gains Remain Uncertain
A powerful El Niño is forecast to deliver wetter winter weather to the Colorado River Basin, but experts doubt it will substantially refill Lake Mead or Lake Powell.
Forecasters anticipate a historic-strength El Niño during the upcoming winter, likely bringing above-average rain and snowfall to the Colorado River Basin. The National Weather Service's Climate Prediction Center notes the heightened chance of classic El Niño impacts, though it cautions that outcomes are not assured. Weather Channel expert Greg Postel says the storm track should produce cooler temperatures and more precipitation, offering temporary drought relief, yet the basin's parched soils may absorb most of the moisture, reducing runoff to reservoirs.
NOAA hydrologist Paul Miller adds that El Niño has no consistent correlation with winter snowpack in the basin, and that reservoir levels depend on broader management decisions. With Lakes Mead and Powell currently at roughly 26 % and 21 % capacity, respectively, any gains from this winter's weather are expected to be modest and unevenly distributed.
Why it matters
Understanding El Niño's limited effect on key water supplies helps policymakers plan for the region's ongoing drought.
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