Overview
- Widespread heat advisories and extreme heat warnings cover large parts of the West, Plains and Midwest with air temperatures near 100°F and heat‑index values forecast around 105–108°F in many areas.
- Health and infrastructure have been strained by the heat, and emergency officials reported 35 people treated and 10 hospitalized for heat‑related illness at a Colorado Springs festival.
- Monsoonal moisture moving into the Southwest is expected to spark mountain and desert thunderstorms through Monday and Tuesday that could produce heavy rain, frequent lightning and localized flash flooding.
- The Storm Prediction Center has placed portions of the Midwest and southeast Michigan in Marginal to Slight risk categories for damaging winds, large hail and isolated tornadoes as convective clusters move eastward.
- Smoke from active Northwest wildfires continues to degrade air quality downwind, and forecast models still show a mid‑to‑late‑week pattern change that should bring more showers and modest cooling but leave timing and local storm impacts uncertain.