Extreme heat, storms threaten millions ahead of summer's official start

Why it matters locally: Utah residents in affected areas should prepare for extreme heat and severe thunderstorms this weekend. The National Weather Service recommends staying hydrated, seeking air-conditioned shelter during peak heat hours, and monitoring alerts for storm and flood warnings.

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Tens of millions of Americans will contend with extreme heat, severe thunderstorms and flash flooding this weekend, several days before summer officially arrives. The convergence of these weather systems creates a dangerous situation across multiple regions. Record-breaking temperatures are already affecting parts of the country, with forecasters predicting conditions will worsen through the weekend. Meteorologists identified a combination of atmospheric factors driving the hazardous conditions. Extreme heat will persist in some areas while other regions face severe thunderstorms capable of producing flash flooding. The dual threat poses risks to public health and safety. Heat-related illnesses spike during extended periods of extreme temperatures, particularly for vulnerable populations including children, elderly people and those with chronic health conditions. Severe thunderstorms can produce damaging winds, large hail and tornadoes, while flash flooding threatens to inundate roads and low-lying areas with little warning. Weather officials urged residents in affected areas to prepare for the weekend. Recommendations included staying hydrated, seeking air-conditioned shelter during the hottest hours and monitoring weather alerts for storm and flood warnings. The early arrival of peak summer heat reflects broader climate patterns meteorologists have tracked in recent years. While the official start to the summer season occurs later this month, forecasters said such early heat waves have become increasingly common.