Firefighters and residents across the Great Basin and Southwest are bracing for extreme wildfire conditions as high winds, low humidity and hot temperatures persist through the weekend. The National Weather Service in Salt Lake City issued a rare “particularly dangerous situation” red flag warning — the first in that office’s history — for parts of Utah, citing the volatile mix of weather and dry fuels.
Those conditions are complicating efforts to contain the Cottonwood Fire, the largest active blaze in the U.S., which is burning in a remote area of southern Utah. Incident managers say crews have been pulled back from some lines because gusty winds — around 40–45 mph — and single-digit relative humidities, combined with fuel moistures of roughly 2–8%, make frontline work unsafe. Helicopters and other aircraft were also grounded when winds made aerial suppression too risky.
The fire has consumed an area larger than Salt Lake City and remains uncontained. The National Weather Service expects critical fire weather to continue into Sunday, though cooler temperatures and higher humidities could offer some relief next week.
Longer-term conditions are worsening the threat. Much of Utah, Nevada, Colorado and other Intermountain states are in widespread drought after an unusually dry winter. Snow levels were at record lows in parts of the Rockies, and Utah’s snowpack peaked weeks earlier than normal and was the lowest on record, reducing spring and early-summer runoff that normally dampens fuels.
Faced with the drought and multiple large blazes stretching resources, Utah Gov. Spencer Cox issued an emergency order temporarily restricting fireworks around the Fourth of July.
Experts note human activities cause the vast majority of U.S. wildfires and that warming climates are making fires larger and more severe. A recent study in Proceedings of the National Academy of Sciences found high-severity forest fires now burn roughly ten times more acreage annually than in 1985. Researchers warn that a century of aggressive suppression has left many forests overgrown, and rising temperatures and shifting precipitation patterns are turning historically manageable fires into destructive, high-severity events with major ecological and economic consequences.
