El Niño is currently intensifying , shifting wildfire risks across the United States. While the Southwest may see decreased danger, the Northern Rockies face a higher probability of severe fires this coming spring and summer.
The 1.5°C Threshold and the 90% Probability of a 'Very Strong' Event
The National Interagency Fire Center (NIFC) reports that El Niño has developed and is gaining strength,with central Pacific sea surface temperatures nearing 1.5 degrees Celsius above the average. This specific temperature mark serves as the threshold for a strong El Niño event. Furthermore, the Climate Prediction Center (CPC) indicates there is a greater than 90 percent chance that this will evolve into a "very strong" event during the fall and winter of 2026-27.
This climate phenomenon essentially rearranges global weather odds by weakening the Pacific trade winds that normally blow east to west. as unusually warm surface water spreads eastward across the tropical Pacific, it alters the jet stream, which in turn dictates where moisture falls and where heat accumulates across the North American continent.
Why Montana and Idaho Face Heightened Spring Fire Danger
Research from the National Oceanic and Atmospheric Administration (NOAA) and the Cooperative Institute for Research in Environmental Sciences suggests that an autumn El Niño often leads to unusually high pressure over the northern tier of the U.S. this atmospheric shift increases the likelihood of large-scale wildfires in the Eastern and Northern Rockies during the following spring and summer.
According to the report, the regions most at risk include Montana, Idaho, North Dakota, South Dakota, and Wyoming. In these northern latitudes, El Niño tends to tilt the weather toward warmer and drier conditions, which strips moisture from vegetation and creates a volatile environment for ignition.
How a Southward Jet Stream Protects Arizona and New Mexico
Conversely, the Southwest Geographic Area—which includes Arizona, New Mexico, and portions of Oklahoma and Texas—is expected to see a lower likelihood of extensive burning. As reported by NOAA, the likelihood of extensive burns in this region is consistently halved following an autumn El Niño because the Pacific jet stream is pushed further south .
This shift brings increased precipitation and lower evaporative demand to the Southern U.S. When vegetation remains damp and temperatures stay cooler, the fuels required to sustain massive forest fires are less likely to reach the critical dryness needed for widespread devastation .
The Grassland Paradox: Why Wet Winters Fuel Fast-Burning Fires
While forest fire risks may drop in the South, wetter conditions can create a different kind of danger in grasslands. park Williams, a UCLA professor of geography and hydroclimatologist, noted that wet winter-spring conditions promote the growth of grasses, which serve as a "fine-textured fuel" that burns extremely hot and fast.
This means that while the Southwest may avoid the catastrophic forest fires that are typically the most expensive to combat, it may instead face more severe grass fires. The very rain that protects the forests effectively "plants" the fuel for rapid-fire spreads across the plains of the southern U.S.
The Missing Variables: Lightning and Local Wind Patterns
Despite the predictive power of the El Niño-Southern Oscillation, several critical variables remain unknown for the upcoming season. The NIFC notes that wildfire danger is not uniform across entire states but is regional, meaning local conditions can override the broader El Niño trend.
Specifically, the source does not account for the timing of lightning strikes or the behavior of individual local wind systems, both of which can trigger disasters regardless of the overall moisture levels. Because the report relies on large-scale atmospheric circulation, it cannot predict the specific "spark" events that often determine the severity of a fire season.
Comments 0