Wednesday, June 30, 2021

COTW: Deniers Like It Hot, Very Hot!

US Person is not one of those. After sweating out a heat wave of record breaking levels (Portland, OR: 115), US Person posts this chart from NASA:
A massive heat dome settled in over the Northwest last weekend, sending temperatures into the stratosphere. A heat dome can form without the impact of anthropomorphic global heating, but not one sending temperatures to levels never before recorded. Canada observed its hottest day on record: 116 degrees in British Columbia. Death Valley, CA recorded the highest temperature on Earth ever reliably recorded: 130 degrees The heat killed people. Recent research projects that heat stress will triple in the Pacific Northwest by 2100. Heat waves occur three times more often than in the 1960's and cover more land area.

Atmospheric Researcher Michael Mann at the Pennsylvania State University tell US that the latest record breaker was an example of an "Omega-block" pattern in which the jet stream follows a path described by the Greek letter Ω. Such patterns [see image below courtesy Penn State] are caused by a phenomenon called wave resonance in which the slowing jet stream wiggles around the Arctic Circle, which is itself heating to unprecedented levels. These waves allow the formation of localized, deep high pressure domes that stagnate.
Omega block over Texas, 2018