Overview
- National Weather Service offices have issued widespread Heat Advisories, Extreme Heat Watches and an Extreme Heat Warning for parts of Arizona and California as the heat dome holds, with Phoenix forecasts calling for afternoon highs from 108°F to 119°F.
- Cities across the Southwest and Texas are logging repeated triple‑digit highs and heat‑index readings commonly above 108°F, and local offices warn overnight lows will remain well above normal, reducing nighttime cooling.
- Scattered afternoon and evening storms tied to monsoonal moisture will produce localized heavy rain, lightning and a few strong to severe storms in places such as Colorado and parts of the Gulf Coast, but those storms are unlikely to deliver widespread relief to hot regions.
- Officials and media reports say the prolonged heat increases the chance of heat‑related illness, strains demand for cooling and power, and raises the risk of wildfire starts where lightning strikes dry fuels.
- Forecast models suggest the ridge may weaken or shift later next week but timing and scope of any relief are uncertain so short‑term guidance from local NWS offices and heat alerts remains the best source of safety information.