National Weather Service United States Department of Commerce

Thunderstorms and Heavy Rain in the Mid-South; Heat Continues in the Southeast and Southwest

Severe thunderstorms and heavy rain are expected across portions of the mid-Mississippi Valley into the Ohio Valley and portions of Arizona. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that, when combined with oppressive dew points, little-to-no relief from the scorching daytime highs will be available. Read More >

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Last Map Update: Tue, Aug 18, 2026 at 11:22:54 pm CDT

Dangerous heat will spread back into all of eastern Oklahoma and western Arkansas for Tuesday and Wednesday, with heat index values in excess of 110 expected across most of eastern Oklahoma and west central Arkansas both days. Little nighttime relief is expected either. Heat stress will remain high during this period.
High heat stress conditions will persist through at least the middle of the week and will continue to impact outdoor activities. Some minor heat relief is forecast on Thursday and Friday. Dangerous heat returns this weekend into next week.
Isolated to scattered thunderstorms are expected to develop by late afternoon or early evening Wednesday across far northeast Oklahoma and far northwest Arkansas. Locally strong to severe downburst winds and large hail up to half-dollar size will be the main threats with storms that develop.
Hot temperatures continue through midweek, with isolated to scattered thunderstorm potential late Wednesday afternoon into Thursday morning. Slightly cooler for some on Thursday and into Friday, but back to the hot weather by this upcoming weekend.
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