Michael Mann, distinguished professor of atmospheric science at Pennsylvania State University and author of the new book "The New Climate War."īut calling it a new normal does not suffice says Mann, "Some people called this a 'new normal. "There is no context really, in the sense that there is no analog in our past for what we are likely to see this week," says Dr. Turns out, the models were correct and we should expect extreme heat waves, even unprecedented ones like this to become more routine. #ORwx #WAwx /W9yr7XXxLF- Daniel Swain June 23, 2021 There remains some uncertainty, but places along I-5 corridor from Medford to Seattle have potential to *shatter* all-time records. Projected temperatures on Sun-Mon across PacNW are so extreme that I think folks are having difficulty putting them into context. Intermountain West, Desert Southwest and California with hundreds of record highs. This heat wave comes on the heels of another historic heat wave less than two weeks ago that baked the U.S. The core of the heat dome, as measured by the thickness of the air column over British Columbia and the Pacific Northwest, is - statistically speaking - equivalent to a 1-in-1,000-year event or even a 1-in-10,000-year event. The heat is being caused by a combination of a significant atmospheric blocking pattern on top of a human-caused climate changed world where baseline temperatures are already a couple to a few degrees higher than nature intended. Portland has already broken its former all-time record of 107. These are all-time heat records for select cities prior to the current heat wave. What is a heat dome? Extreme temperatures in the Pacific Northwest, explainedīy Monday, some - if not all - of the all-time record highs seen below are forecast to break, with many more cities not listed here expected to achieve the same feat.These are extremely dangerous numbers, especially in a region not used to heat like this, where many people do not have air conditioning. Canada is expected to register the nation's all-time highest temperature before the event is done. Portland, Oregon, has already broken its all-time record hottest temperature at 108 degrees on Saturday and the peak of the heat wave has not even been reached yet. By one measure it is more rare than a once in a 1,000 year event - which means that if you could live in this particular spot for 1,000 years, you'd likely only experience a heat dome like this once, if ever. Pacific Northwest and British Columbia, Canada, is of an intensity never recorded by modern humans. While this year will see some hot days in the near future, such extreme heat is not anticipated.The heat wave baking the U.S. All-time record highs were shattered as temperatures reached 20 to 30 degrees above normal in spots, including an especially notable high temperature of 116 degrees last June 28 in Portland. The upcoming warm spell will pale in comparison to the extreme temperatures seen in the Northwest a year ago. Those looking to cool off in area lakes and rivers will also want to exercise caution water temperatures will be much colder than the air temperature, introducing a risk of cold water shock. Those spending time outdoors will want to take steps to prevent heat-related illnesses, as well as know the signs of heat exhaustion and heatstroke. While this round of heat is not likely to break daily records, it will still be impactful in the region.
Hotter weather will also build east of the Cascades with highs near 90 degrees in Boise, Idaho, which is around 5 degrees above normal for late June. Average highs for this time of year in Seattle are in the low 70s. While Seattle is only forecast to peak at 74 degrees on Friday, highs in the low to mid-80s are expected over the weekend. Farther north, the warmer weather may take a day longer to settle in.
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