National Weather Service United States Department of Commerce

Severe Thunderstorms in the Midwest and Arizona; Heat Continues in the Southeast and Southwest

Thunderstorms, some severe, may lead to scattered instances of flash flooding across the Midwest and Ohio Valley and southern Arizona. The threat will shift to the Mid-Atlantic coast on Thursday. Dangerous heat persists in the South and Southeast while building into the Southwest. Overnight lows will be so warm that little-to-no relief from the scorching daytime highs will be available. Read More >

Click a location below for detailed forecast.

Last Map Update: Thu, Aug 20, 2026 at 3:24:45 am MST

An Extreme Heat Warning has been issued for areas of the Grand Canyon below 4000 feet through 8 PM MST Thursday. Expect temperatures as high as 111 degrees near Phantom Ranch.
Monsoon moisture continues to move into the area. Expect precipitation chances to increase over the next couple days. Some of the storms could produce heavy rain that may lead to flash flooding so use caution if you have any outdoor plans.

 

Text Product Selector (Selected product opens in current window)