Heat dome

Weather phenomenon

A heat dome is a weather phenomenon consisting of extreme heat that is caused when the atmosphere traps hot air as if bounded by a lid or cap. Heat domes happen when strong high pressure atmospheric conditions remain stationary for an unusual amount of time, preventing convection and precipitation and keeping hot air "trapped" within a region. This can be caused by multiple factors, including sea surface temperature anomalies and the influence of a La Niña. The upper air weather patterns are slow to move, referred to by meteorologists as an Omega block.

Also known as...

Anticyclonic dome

Wikipedia

US & Canada World Science

Wildfires Force Evacuations in Oregon and BC

Wildfires in Oregon and British Columbia forced evacuations as a heat dome intensified the blazes.

Warm Springs reservation evacuates as wildfires burn through central Oregon The Oregonian — Jul 26, 01:22 AM
Unbearable heat suspected in 19 New Jersey deaths as high temperatures give way to thunderstorms Boston Globe — Jul 05, 22:31 PM
At least 25 people die in US as record heatwave scorches swaths of country The Guardian — Jul 05, 18:49 PM
Lightning, rain and extreme heat disrupt Trump’s big moment on Independence Day Metro — Jul 05, 09:44 AM
Severe weather at DC's America 250 celebration prompts 2-hour evacuation 📹 Associated Press — Jul 05, 05:55 AM · 43sec
Severe weather disrupts US’s 250th celebrations Al Jazeera — Jul 05, 02:54 AM
Record heat wave disrupts America 250 celebrations in DC 📹 AP News — Jul 05, 02:15 AM · 1min
Storms force evacuation of July 4 celebrations in Washington Financial Times — Jul 05, 00:20 AM
Evacuation ordered at National Mall as storms gather ahead of Trump’s July Fourth speech MS Now — Jul 04, 23:45 PM
Trump praises DC crowds and downplays heat wave: ‘Isn’t as bad as predicted’ Washington Examiner — Jul 04, 21:20 PM
Heat wave cancels some DC Independence Day celebrations Washington Examiner — Jul 04, 17:36 PM
Washington DC’s iconic 4th of July parade canceled due to scorching temperatures NY Post — Jul 04, 13:50 PM
America’s Independence Day Parade canceled in Washington, D.C. al.com — Jul 04, 10:57 AM
Extreme heat shuts down the Great American State Fair in DC for a few hours 📹 Associated Press — Jul 04, 07:36 AM · 1min
Heatwave upends Fourth of July events across US, strains power grids South China Morning Post — Jul 04, 03:30 AM
Extreme Heat Disrupts US Independence Day Celebrations 📹 Al Jazeera — Jul 03, 23:04 PM · 1min
Extreme heatwave overshadows US independence day celebrations as Washington breaks heat record ITV — Jul 03, 21:59 PM
Dangerous heatwave hits peak temps along US east coast Channel News Asia — Jul 03, 21:13 PM
How the Heat Is Upending Plans for America’s 250th Birthday The New York Times — Jul 03, 21:12 PM
Tens of millions bake under July 4 weekend heat dome as NYC swelters through hottest day in 14 years ahead of America 250 celebrations Daily Mail — Jul 03, 16:54 PM