Even though it was proclaimed the third warmest year ever documented, 2025 represented a comparatively calm period for environmental catastrophes in the US. Significant hurricanes did not reach the coast, while the overall acreage consumed by fire last year—an indicator of the severity of wildfire season—was less than the decade’s typical figure.
However, commencing this week, the West is undergoing what appears to be an unprecedented heat spell, and predictive simulations forecast that a powerful El Niño occurrence is anticipated to manifest later this year. These two distinct occurrences could create conditions for an extended period of volatile and severe atmospheric conditions extending into the subsequent year, exacerbating the impacts of a climate steadily warming due to anthropogenic actions.
Firstly, the heat factor. Starting this week and continuing into the following one, a colossal high-pressure system will usher in historically high temperatures to the American West. The National Weather Service forecasts that temperature benchmarks across multiple states are poised to be surpassed in numerous areas, extending eastward to include Missouri and Tennessee. The NWS has released advisories for extreme heat for parts of California, Arizona, and Nevada, and also alerts for fire hazards for parts of Wyoming, Nebraska, South Dakota, and Colorado.
“This will be the most potent high-pressure system we’ve witnessed in any non-summer month,” stated Daniel Swain, an environmental researcher at the University of California Agriculture and Natural Resources.
Another notable aspect about this heat wave, Swain says, is its anticipated duration. “This is not merely a brief period of intense warmth,” he clarifies. “We’ve already in some of these places been observing unprecedented daily maximums for seven days, and we anticipate their daily recurrence for an additional seven to ten days at a minimum.” The concluding days of March will intensify significantly, with temperatures in some places surpassing temperature highs for April and May. “Few meteorological configurations can generate an 85- or 90-degree temperature in San Francisco, Salt Lake City, and Denver within the same seven-day span.”
This unseasonably warm spell in late winter is compounding an already mild winter in the West—with significant repercussions for the upcoming summer. Thirty days prior, the quantity of accumulated snow across multiple states reached unprecedented minimums due to temperatures exceeding the norm. Based on figures furnished by the Department of Agriculture, snow accumulation levels were still remaining at less than half of the typical amount across many Western states. Snowpack is an essential natural storage for rivers in the West; a substantial portion, ranging from 60 to 70 percent, of the area’s water provision originates from thawing snow. Diminished snow cover bodes ill for presently strained waterways like the Colorado, which provides hydration for forty million individuals across seven jurisdictions.
The current intense heat, Swain says, is highly probable to exacerbate the situation. “April 1st is customarily the time when snow accumulation would, historically speaking, reach its maximum,” he remarks. Should temperatures moderate before summer arrives, these low snowpack levels are also a concerning indication for the approaching wildfire period. Arid snow conditions, such as those afflicting the West, are capable of parching the ground, causing tree mortality, and diminishing watercourse volume: perfect circumstances for a conflagration to spread. Meanwhile, the volume of water in the Colorado River might decrease further. Jurisdictions dependent on this river are already encountering a governmental dilemma as they endeavor to re-evaluate water entitlements; a period of aridity would merely heighten the stakes.
Next, consider El Niño. The previous week, the National Weather Service declared that there was a greater than 60 percent probability of an El Niño phenomenon manifesting in August or September. Diverse meteorological simulations indicate that this El Niño might prove exceptionally powerful. While certainty will probably elude us until the summer months, “the upward trend of [all the models] warrants attention,” says Zeke Hausfather, an investigative scientist affiliated with Berkeley Earth.
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