Phoenix, AZ – A rare March heat wave is building across the western United States today, with temperatures forecast to surge 20 to 30 degrees above normal through the weekend. Desert cities including Phoenix and Las Vegas could approach or exceed 100 degrees, an unusually early milestone for the region.
According to the NOAA Weather Prediction Center, the heat wave is expected to intensify Friday through Sunday as a strong upper-level ridge remains locked over the Southwest and parts of California. High temperatures across Arizona, Nevada, and Southern California may reach the 90s, with some desert locations potentially hitting the century mark.
Forecasters say this pattern could break multiple daily temperature records and possibly challenge all-time March records in several cities.
The unusual warmth may also affect travel conditions across major highways in the region, including Interstate 10, Interstate 15, and Interstate 40, where prolonged heat can increase vehicle strain and raise the risk of roadside breakdowns during peak afternoon temperatures.
Health officials warn the early-season heat may pose increased risks for vulnerable populations, including older adults, outdoor workers, and people without reliable cooling.
According to NOAA, heat-related illnesses become more likely during sudden early-season temperature spikes because many people have not yet acclimated to extreme heat conditions.
Meanwhile, snowmelt from the rapid warming could increase cold-water dangers in rivers and streams across parts of the West. Despite the hot air temperatures, waterways remain dangerously cold and can trigger cold-shock or hypothermia if someone falls in.
The heat wave is expected to persist across the Southwest and parts of the Great Plains into the start of next week before conditions gradually moderate.
This article was produced by a journalist and may include AI-assisted input. All content is reviewed for accuracy and fairness.
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