Overview
- Large areas of the United States are under Heat Advisories and Excessive Heat Warnings with heat‑index values often topping 100°F, producing dangerous conditions for outdoor workers, older adults and children.
- Forecasters report the upper‑level ridge that produced the heat is moving west, which will allow fronts and midlevel lows to trigger scattered showers and thunderstorms this weekend in the Gulf Coast, Midwest and Northeast.
- Where instability and Gulf moisture overlap, storms could produce damaging winds, heavy downpours and isolated hail, raising localized severe and flash‑flood risk in parts of the Plains and Mississippi Valley.
- The West and northern High Plains, including much of Montana and interior California, are forecast to get hotter and drier with record‑threatening highs and Fire Weather Watches in place because low humidity and gusty winds will elevate wildfire danger.
- The pattern change should bring modest cooling and lower humidity for some regions next week, the Atlantic basin is expected to remain quiet, and residents should follow local NWS alerts and take heat‑safety steps during the transition.