Two Heat Domes — Europe at Peak, the Eastern US Into July 4 — June 19–29, 2026

767 distinct agency-issued heat alerts across ~40 countries in 10 days (375 WARNING, 42 WATCH, 332 ADVISORY, 18 INFORMATION) — the densest heat-alert footprint this brief has recorded. Europe carries 687 of them at peak (Austria 126, China-CMA 101, Slovakia 62, Poland 47, Greece 35); the United States (50) and Canada (20) form a second dome forecast to converge on the eastern U.S. for the July 4 holiday weekend. Heat alerts are agency FORECASTS/WARNINGS, not confirmed events. Confirmed-event layers: 351 active wildfires, 5 Canadian wildfire-smoke air-quality WARNINGs, 12 active volcanoes, the Venezuela M7.5 doublet and a Kamchatka M6+ swarm, South American floods and storms, 17 disease outbreaks (Ebola at WARNING), and 16 active combat events.

Events by Type (392 total)

Earthquakes — Venezuela Doublet + Kamchatka Swarm (confirmed): 12

European Heat Alerts — Agency FORECASTS/WARNINGS (not confirmed events): 70

US + Canada Heat Alerts — the July 4 Forecast Dome (FORECASTS/WARNINGS): 60

Asia + Other Heat Alerts (China, India, Mideast) — FORECASTS/WARNINGS: 45

Active Wildfires (NASA FIRMS — satellite-observed): 140

Canada Wildfire-Smoke Air-Quality WARNINGs: 5

Active Volcanoes: 12

Floods + Storms — South American Wet Season (confirmed/active): 20

Disease Outbreaks (confirmed): 12

Active Combat Zones: 16