Western U.S. Heat Dome Brings Record Temperatures And Wildfire Danger
On Saturday, August 1, 2026, a heat dome over the Western United States drove record temperatures and heightened wildfire danger from Arizona through Montana.[1]
Forecast highs were pushed to about 116°F in Phoenix, 115°F in Las Vegas, 118°F in El Centro and 104°F in Great Falls.[1] Las Vegas officials warned overnight lows would stay in the upper 80s to low 90s, offering little nighttime relief and raising dangers for vulnerable residents.[1]
A persistent high-pressure heat dome parked over the region has trapped hot, dry air and limited cooling at night, intensifying heat stress and fire risk across the affected states.
Most of Montana is under red flag warnings and the U.S. Forest Service says wildfire risk is enhanced across most of Southern California through Sunday.[1]
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📌 Key Facts
- On Saturday, August 1, 2026, a heat dome from Arizona to Montana pushed forecast highs to 115°F in Las Vegas, 116°F in Phoenix, 118°F in El Centro and 104°F in Great Falls.
- Las Vegas overnight lows are expected to remain in the upper 80s to low 90s, prompting warnings about dangerous conditions due to lack of nighttime relief.
- Most of Montana is under red flag warnings and the U.S. Forest Service reports enhanced wildfire risk across most of Southern California through Sunday.
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