Low snow water content tied to higher wildfire burn severity, analysis finds

The Rocky Mountain West faces unprecedented challenges this winter as record-breaking high temperatures and historically low snowfall raise concerns about water availability this spring. However, groundbreaking research from Western Colorado University reveals an additional threat: these conditions may lead to significantly more severe wildfires this summer.

Published in the journal Environmental Research Letters, the comprehensive study conducted by researchers from Western's Clark School of Environment and Sustainability demonstrates that declining snowpack creates a dual impact on wildfire patterns—extending fire seasons while dramatically increasing burn severity.

The research team analyzed 36 years of snowpack and wildfire data across western United States forests, uncovering two interconnected yet distinct relationships. Their findings show that early snowmelt correlates strongly with earlier fire seasons and expanded total burned area. More critically, low snow water content—representing the actual water volume stored in winter snowpack—directly links to heightened fire severity, resulting in increased tree mortality, substantial ecosystem disruption, and elevated risk of permanent forest loss.

"Snowpack functions as a natural seasonal water reservoir for forest ecosystems," explains Dr. Jared Balik, the study's lead author and Western research scientist. "When this reservoir becomes depleted, soil moisture decreases prematurely, vegetation desiccates, and forests become increasingly susceptible to devastating fires."

While existing research has established connections between rising temperatures, earlier snowmelt, and extended fire seasons, this innovative study reveals how reduced snow storage directly influences the destructive intensity of forest fires.

The analysis consistently demonstrated that years characterized by low snowpack corresponded with higher burn severity across all studied watersheds from 1985 to 2021. This year's conditions are particularly concerning, as virtually every river basin in the West currently experiences below-normal snowpack levels. The implications are especially significant for southwestern watersheds, including the Rio Grande and Colorado River basin, where long-term snowpack decline has been most pronounced.

The research also examines the influence of global climate oscillations such as El Niño and La Niña phenomena. These patterns can either enhance or diminish regional winter snowpack accumulation, subsequently affecting the severity of following fire seasons depending on geographic location.

However, the overarching trend indicates a clear trajectory toward warmer winters and reduced snowpack, ultimately producing earlier melt periods and more frequent high-severity forest fires.

High-severity fires generate substantial cascading ecological consequences, the paper notes, including post-fire flooding, debris flows, and increased probability of forest-to-grassland or shrubland conversion under increasingly warm and arid conditions.

The research team, including Dr. Balik, Western professor Dr. Jonathan Coop, and Dr. Sean Parks of Ariel Re, suggests that snowpack conditions could function as an early warning system for fire severity risk. This predictive capability would enable land managers to modify forest thinning operations, prescribed fire programs, and emergency preparedness strategies based on winter snowpack assessments.

"As snowpack experiences continued long-term decline, we must anticipate not merely increased fire frequency, but substantially more severe fire behavior," states Dr. Coop. "Understanding these relationships enables proactive planning for years with conditions like we're experiencing now, while emphasizing the critical need for forest management interventions such as prescribed burning that can mitigate wildfire impacts."

Despite concerning projections for the upcoming wildfire season, researchers maintain cautious optimism. "We're still in March, and substantial spring precipitation could significantly alter current conditions," notes Dr. Balik.

Publication details

Jared A Balik et al, Snowpack decline kindles more severe fire in the western United States, Environmental Research Letters (2026). DOI: 10.1088/1748-9326/ae4e4a