Overview
- The heat peaked over the weekend, with preliminary readings showing Phoenix near 117°F and Las Vegas and El Centro approaching or matching daily records, putting many inland deserts and valleys in the triple digits.
- National Weather Service offices have issued multiple Extreme Heat Warnings and Heat Advisories across the West that remain in effect into early this week, with some desert warnings extended through Tuesday or Monday night.
- Fire officials reported heightened danger across the Pacific Northwest and parts of the interior West, prompting a rare 'particularly dangerous situation' Red Flag alert, emergency declarations in Washington and broad outdoor‑burn bans.
- Warm overnight lows are providing little relief, driving a surge in demand for cooling centers and shelters and increasing heat‑illness risk for seniors, outdoor workers and people without air conditioning.
- Separately, the UKHSA and the Met Office issued 48‑hour amber heat‑health alerts for parts of England for Aug. 3–5, and forecasters warn El Niño and long‑term warming trends are increasing the frequency and severity of these heat episodes.