A convergence of above-normal temperatures, persistent drought, and unusually warm ocean waters is raising early wildfire risk across parts of the western and southern United States, weeks before peak fire season typically begins. Federal forecasts for April through June 2026 favor hotter and drier conditions over much of the continental U.S. Separately, NOAA satellite products show elevated sea surface temperature anomalies; researchers have linked warmer oceans to shifts in weather patterns that can influence where moisture goes and how dry inland air becomes. CAL FIRE incident listings show early-season fires in California, and the Southern Area spring risk assessment reports extremely low 100-hour fuel moisture in parts of the Southern Plains.
Federal Forecasts Flag a Hotter, Drier Spring
The seasonal outlook published by the NOAA Climate Prediction Center for April through June 2026 favors above-normal temperatures over much of the contiguous United States, with the highest probabilities concentrated in the Intermountain West, Rockies, and Southwest. The same discussion projects below-normal precipitation for much of the West, a combination that strips moisture from soils and vegetation heading into the warmest months.
Those forecasts align with conditions already on the ground. As of early March 2026, 54.88% of the Lower 48 states were classified as being in drought, according to NOAA Drought.gov, which integrates U.S. Drought Monitor data. The National Interagency Fire Center’s March 2026 outlook noted that February had a warm and dry start in the Northwest, though a more active weather pattern during the latter half of the month partially offset the deficit. That brief reprieve, however, did little to reverse the broader drying trend visible in fuel moisture data across the Southern Plains.
Fuel Moisture Drops to Dangerous Levels
Fire behavior analysts track 100-hour fuel moisture as a key indicator of how readily dead wood and brush will ignite. The Southern Area Wildfire Risk Assessment for Spring 2026, issued by the National Interagency Fire Center’s Southern Area Coordination Center, reported that 100-hour fuel moisture is extremely low in Texas, Oklahoma, and northwest Arkansas. When readings drop this far, even small ignition sources, whether lightning, equipment sparks, or discarded cigarettes, can trigger fast-moving fires.
The concern is not limited to the South. In California, areas above 7,000 feet in the Sierra and Mono County have already experienced early-season timber fires, according to CAL FIRE’s 2026 incident archive. High-elevation fires this early in the year are unusual and can coincide with earlier snowmelt and exposed fuels, potentially widening the window for ignition ahead of the traditional summer fire season. Reporting from the New York Times noted that wildfires in California have shifted from seasonal hazards to year-round catastrophes, with peak fire season potentially arriving earlier this year.
Warm Oceans Amplify Atmospheric Dryness
The third element in the headline’s equation, warm ocean temperatures, connects to wildfire risk in a less obvious but measurable way. NOAA’s Coral Reef Watch program tracks daily global sea surface temperature anomalies at 5-kilometer resolution using satellite observations. Those anomalies represent the departure from normal SST for each day of the year. When ocean temperatures remain persistently elevated, they meet the scientific threshold for marine heatwaves, defined by Hobday et al. (2016) as sea surface temperatures at or above the 90th percentile for at least five consecutive days, a standard NOAA uses in its marine heatwave calculations based on the NOAA OISST Climate Data Record.
Why do warm seas matter for fires burning hundreds of miles inland? The Woods Hole Oceanographic Institution explains that weather patterns are changing due to warmer ocean temperatures because the ocean is central to the movement of water around the globe. Warmer Pacific waters can redirect atmospheric moisture flows, leaving inland regions drier than they would otherwise be. That mechanism helps explain why drought and heat can intensify simultaneously even when global precipitation totals remain relatively stable.
The Physics Linking Heat to Fire-Ready Air
Most coverage of wildfire risk focuses on temperature and precipitation, but a growing body of research points to a third variable: vapor pressure deficit, or VPD. VPD measures the gap between how much moisture the air can hold and how much it actually contains. As temperatures rise, that gap widens sharply because warmer air has a much higher moisture capacity. The result is air that aggressively pulls water out of soil and vegetation, drying fuels even when rain has fallen recently.
Peer-reviewed research published in Nature Communications documented a drastic increase in the magnitude of very rare summer-mean vapor pressure deficit extremes. The study connected warming-driven atmospheric dryness to high-impact conditions relevant to wildfire, quantifying how climate change has made these extremes far more severe. That finding challenges the common assumption that fire risk is primarily a function of precipitation. Even in years with near-average rainfall, rising temperatures can push VPD into dangerous territory, creating fire-ready conditions that forecasters and land managers may not fully anticipate from precipitation data alone.
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*This article was researched with the help of AI, with human editors creating the final content.
