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: Wed, Aug 19, 2026 at 8:16:57 am CDT

Dangerous heat will persist for all of eastern Oklahoma and western Arkansas on Wednesday, with heat index values in excess of 110 F expected across most of eastern Oklahoma and west central Arkansas this afternoon. Little nighttime relief is expected either. Heat stress will remain high during this period.
Isolated to scattered thunderstorms are expected to develop by late this afternoon or early this evening 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.
High heat stress conditions will persist 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.
Hot temperatures continue, with isolated to scattered thunderstorm potential tonight 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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