The severe weather poses significant risks, including damaging winds, large hail, and potential tornadoes in the central U.S. Flood watches are in effect for parts of eastern Kansas, western Missouri, northeast Oklahoma, and northwest Arkansas. On the East Coast, cities like Raleigh, Washington, D.C., Philadelphia, and New York City could experience hazardous storms with lightning and strong winds. In the West, the extreme heat could lead to life-threatening conditions, particularly in Portland and California's Central Valley, where temperatures may exceed 100°F (38°C). Vulnerable populations, such as the elderly and those without air conditioning, are at heightened risk.