Dangerous Heat Grips Northwest Arizona, Southeast California, and Southern Nevada
An Extreme Heat Warning remains in effect for portions of northwest Arizona, southeast California, and southern Nevada, including the Greater Mojave Desert Region, as dangerously high temperatures continue across the Southwest. The National Weather Service warns that life-threatening heat is expected through the evening, with widespread temperatures between 108°F and 114°F, temperatures exceeding 115°F along the Colorado River Valley, and 115°F to 120°F in the lower elevations of Death Valley. Overnight temperatures are also expected to remain dangerously warm, ranging from 80°F to 95°F, providing little relief from the prolonged heat.
Extreme heat is one of the deadliest weather hazards in the United States. Prolonged exposure can quickly lead to heat exhaustion or life-threatening heat stroke, especially when temperatures remain elevated overnight.
Areas Under the Extreme Heat Warning
The warning includes portions of:
- Northwest Arizona
- Southeast California
- Southern Nevada
- Greater Mojave Desert Region
- Colorado River Valley
- Death Valley National Park
Residents and visitors throughout these desert communities should expect hazardous conditions during both the daytime and overnight hours.
What to Expect
Forecast conditions include:
- Afternoon temperatures between 108°F and 114°F
- Isolated areas exceeding 115°F near the Colorado River
- Up to 120°F in Death Valley
- Overnight lows remaining between 80°F and 95°F
- Major to locally extreme heat risk with little nighttime cooling
Heat Safety Tips
During an Extreme Heat Warning:
- Stay indoors in air-conditioned buildings whenever possible.
- Drink plenty of water, even if you do not feel thirsty.
- Avoid strenuous outdoor activities during the hottest part of the day.
- Wear lightweight, light-colored clothing.
- Check on elderly neighbors, young children, and those with chronic medical conditions.
- Never leave children, adults, or pets inside a parked vehicle, even for a few minutes.
- If you must work outdoors, take frequent breaks in shaded or air-conditioned areas.
Seek immediate medical attention if someone develops confusion, loses consciousness, has hot, dry skin, or experiences symptoms of heat stroke.
Fire Weather Concerns
The combination of extreme heat, very dry air, and occasional gusty winds may also increase wildfire danger across portions of the Mojave Desert. Residents should avoid activities that could accidentally ignite vegetation and follow all local fire restrictions.
Stay Weather Aware
This dangerous heat event is expected to continue until the warning expires. Continue monitoring forecasts and official weather alerts, as temperatures may remain hazardous across the Southwest even after the current warning ends.
Stay informed with Radar Watch HQ for the latest severe weather alerts, heat warnings, wildfire conditions, and emergency preparedness updates across the United States.
Radar Watch HQ Top 5 Essentials for Extreme Heat
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When an Extreme Heat Watch or Heat Advisory is in effect, having the right gear can help you stay safer and more comfortable.
A compact, battery-powered fan provides cooling while traveling, working outdoors, waiting at events, or during power outages.
2. Insulated Water Bottle or Tumbler
A high-quality insulated bottle or cup keeps water cold for hours, making it easier to stay hydrated throughout the day.
A handheld misting fan or spray bottle delivers instant cooling by combining fine water mist with airflow.
Portable air conditioners, evaporative coolers (where appropriate), or high-performance tower fans can help reduce indoor temperatures during dangerous heat.
5. Electrolyte Hydration Packets or Drinks
Electrolyte supplements help replace minerals lost through heavy sweating and support hydration during prolonged heat exposure.
