2/28/2023 0 Comments Heat wave pacific northwest![]() Portland reached an all-time record high of 108☏ on June 26th, then shattered that mark the very next day with a *new* all time record of 112☏ on June 27th at Portland International Airport. Seattle set an all-time record high of 104☏ on June 27th. Observations consistent with climate signal #1 The shifting bell curve also leads to the occurrence of never-before-seen extremes in high temperatures. Under the earth's climate system, events closer to the midpoint of the climate range occur much more frequently than events closer to the extremes, as shown in the graphic on the right. Record breaking temperatures are a classic signal of climate change. As the average global temperature rises and the climate shifts, hot temperatures that were extreme under the old climate are closer to the middle of the new temperature range. When the jet stream stalls, high pressure ridges get ‘stuck’, leading to longer and more intense heat waves.Ĭlimate signals breakdown Climate Signal #1: Extreme heat and heat waves The jet stream is increasingly going off its traditional course and sometimes stalls altogether, and there is a growing body of evidence connecting this change in jet stream behavior to climate change. High pressure also pushes the jet stream and its drier, cooler air, farther north. This causes temperatures in the lower atmosphere to heat up. When a high pressure system develops in the upper atmosphere, the air below it sinks and compresses because there is more weight on top. To understand the types of weather conditions generally associated with high and low pressure systems, it helps to think “vertically.”Ī high pressure system has higher pressure at its center than the areas around it. Jet stream patterns favorable for producing heat waves are becoming more common as climate change influences on the atmosphere increase.Ītmospheric pressure is an indicator of weather.By 2050, US heat waves could be an additional 3 to 5☏ warmer. Climate change currently causes rare heat waves to be 3 to 5☏ warmer over most of the United States.Extreme heat and heat waves are the leading cause of weather-related deaths, and global warming increases the frequency, intensity, and duration of these events.Heat waves are more frequent across the US since the 1960s, with western regions setting records for numbers of these events in the 2000s.
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