The extreme heat poses significant health risks, particularly in areas like Kansas and Missouri, where heat indices may reach 107°F (41.7°C). Communities in Arizona, California, and Nevada are also under heat warnings. Wildfires in the Northwest threaten to expand due to dry vegetation and gusty winds, while poor air quality could affect residents in multiple states. Severe thunderstorms in the Midwest and East Coast may disrupt commutes and lead to flash flooding, with areas like Southern Ohio and Eastern Kentucky at risk of receiving up to 12 inches of rain. Hail and heavy downpours are also possible in the Dakotas and Midwest.