The Great “Hot Drought” Humbug: Why Lake Powell Is Really Drying Up

YouTube videos and media headlines love to blame the low water levels at Lake Powell on a single, dramatic narrative: a “hot drought” driven by climate change where rising temperatures are vaporizing the Colorado River.

It’s a convenient story, but it ignores basic thermodynamics, observed watershed hydrology, and century-old math.

Here is the real science behind why the “hot drought” narrative falls apart—and what is actually draining the Southwest’s reservoirs.

1. The Headwater Lie: Below Freezing is Still Below Freezing

The headline claiming a 1.5°F to 2.5°F temperature spike relies on a statistical trick: averaging temperatures across the entire basin, from scorching Arizona deserts up to Colorado’s highest peaks.

• Where the water starts: Over 85% of the river’s flow comes from high-altitude snowpack above 9,000 feet in Colorado, Utah, and Wyoming.
• The basic physics: If an alpine snowpack sits in −10°C air in January and the air rises to −8°C, the snowpack does not melt. Sublimation at these temperatures is negligible compared to liquid spring runoff.
• The takeaway: Snow sublimates primarily due to direct sunlight and wind, not minor bumps in sub-freezing air temperatures. Attributing massive flow loss to “warm air” in the dead of winter violates thermodynamic reality.