Western U.S. Faces Record Low Snowpack, Threatening Water Supply and Wildfire Risk

Lidar-equipped aircraft from Airborne Snow Observatories surveyed the Sierra Nevada this spring and found California’s snowpack at just 18 % of its long-term average on 1 April. Water storage fell to a seasonal record low, prompting managers to describe an “early spigot shut-off.”

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A record-warm winter followed by an intense March heatwave, both intensified by heat-trapping pollutants, accelerated melt. Historically, western water systems counted on snow to persist until mid-summer; the current climate pattern is overturning that assumption.

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Tom Painter, CEO of Airborne Snow Observatories, leads the Lidar program; Tom Albright, Nevada’s deputy state climatologist, monitors runoff. The U.S. Drought Monitor, Climate Central, and state water agencies rely on their data for allocation decisions.

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• Over 60 % of the lower 48 states are in drought, per the U.S. Drought Monitor.

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• California’s snowpack is 18 % of average.

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• Lidar emits ~800,000 pulses per second, measuring depth within 3 cm.

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• Nevada’s spring runoff is arriving two months early.

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The early loss of snow reduces the “frozen reservoir” that supplies drinking water to millions and irrigates farms. Low snowpack jeopardizes Colorado River reservoirs and extends the fire season, raising the risk of large wildfires across the West.

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The U.S. Drought Monitor calls this the most extensive spring drought since 2000, urging agencies to prepare for reduced supplies. Climate Central notes the water-storage deficit is far below historic peaks. State water managers call the Lidar data a “survival guide” for planning.

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A minority of observers argue the current drought may be an outlier given past variability, but climatologists stress that such extremes are becoming more frequent, framing the event as a preview of future water stress.

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Near Reno, Nevada, Albright observed a rapidly flowing stream, confirming that snow-melt runoff is arriving two months ahead of schedule, matching the Lidar and satellite data.

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• “This is a distinct dry year,” — Tom Painter, CEO, Airborne Snow Observatories

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• “In March the spigot shut off and it shut off across the entire western US,” — Tom Painter, CEO, Airborne Snow Observatories

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• “We wish we could tell it to stay put a little longer,” — Tom Albright, Deputy State Climatologist, Nevada

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• “What happens when we don’t have the snowpack is we lose what water there was early and then we’re left with this really long dry season,” — Tom Albright, Deputy State Climatologist, Nevada

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Officials expect heightened wildfire danger this summer and plan to revise water allocations for cities and farms. Ongoing snowpack and runoff monitoring will guide emergency response and longer-term adaptation strategies.

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