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Heat Across the Center of the Nation; Severe Thunderstorms Across the Great Lakes and Ohio Valley

Heat expands across the Desert Southwest, Plains, Mississippi Valley and Midwest into Monday. Fire weather concerns continue for portions of the Intermountain West. Active monsoonal moisture fuels thunderstorms over the Southwest with possible flash flooding. Tropical cyclone Fausto in the Pacific, should weaken as it approaches Hawaii; Dangerous surf, swells and rip currents are expected. Read More >

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Last Map Update: Tue, Jul 21, 2026 at 10:12:26 am CDT

Dangerous heat conditions are forecast again Wednesday across much of the region. An Extreme Heat Warning and Heat Advisory are in effect from Noon to 9 PM for heat index values from 105 to 115 degrees across eastern Oklahoma and west-central Arkansas.
Dangerous heat continues across portions of the area through Friday, with heat index values of 105 to 115 degrees expected. Slightly cooler conditions will develop this weekend areawide.
During Extreme Heat: Find air conditioning. Avoid strenuous activities. Wear light clothing. Check on family members and neighbors. Drink plenty of water. Watch for heat cramps, exhaustion, and stroke. Never leave people or pets in a closed car.
Low to moderate shower and thunderstorm chances exist today through tonight, across parts of far eastern Oklahoma and northwest Arkansas. Severe weather is not expected, but gusty winds and moderate rain may accompany the strongest storms.
Widespread dangerous heat continues this week. Anticipate Heat Advisories and Extreme Heat Warnings almost daily. Expect increasing potential for showers and thunderstorms mid to late week.
KSRX Radar (Fort Smith, AR).
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