We had a similar thread back in 2010.
Now a high pressure heat dome is sitting over eastern Washington, Oregon and northern Idaho, and up into Canada. Cities and towns are experiencing record temperatures for June. Normally such temperatures aren't experienced until mid-to-late July or early August, if at all.
AP - Seattle hit 107 degrees Fahrenheit (42 Celsius) by mid-afternoon — well above Sunday’s all-time high of 104 F (40 C) — on the way to an expected high of 110 F (43 C). Portland, Oregon, reached 115 F (46 C) after hitting new records of 108 F (42 C) on Saturday and 112 F (44 C) on Sunday.
In the Columbia basin high temperatures were between 111 - 115 F (44 - 46 C). Tomorrow, temperatures may peak around 117-118 F (47-48 C).
Portland, Seattle and Canada break all-time records again amid historic heat wave
Temperatures shot up even higher Monday after setting all-time marks on Sunday. Portland and Seattle climbed to at least 115 and 108 degrees. A town in British Columbia hit 118.
The strength of the heat dome, or sprawling zone of high pressure centered near the U.S.-Canada border, promoting these temperatures is setting records and off the charts. Its intensity is so statistically rare that it might be expected only once every several thousand years on average. But human-caused climate change has made exceptional events such as this many times more probable.
Seattle had three consecutive days in the 100s F for the first time since records have been maintained. More the half of homes do not have airconditioning (cooling).
- Portland reached at least 115 degrees, topping 112 from Sunday and 108 from Saturday. (Before this weekend, the previous record was 107 from 1981.)
- Seattle reached 108 degrees, topping 104 degrees from Sunday. (Before this weekend, the previous record was 103 from 2009.)
- Spokane reached at least 108, tying the mark from 1928 and 1961.
- Dallesport, Wash., reached 118 degrees, which preliminarily ties the Washington state record.
- Salem, Ore., reached at least 117 degrees, topping 113 from Sunday. (Before the weekend, the previous record was 108 from 1927, 1941, and 1981.)
- Vancouver, Wash., reached 116 degrees, topping 112 degrees Sunday and 108 on Saturday. (Saturday’s 108 tied a previous mark from 2009.)
- Moses Lake, Wash., reached 112 degrees, tying 112 in 1961.
- Quillayute, Wash., reached 110, topping a record of 99 from 1981.
- Olympia, Wash., reached 110 degrees, surpassing the 105 mark from Sunday, 2009 and 1981.
- Bellingham, Wash., reached 99 degrees, topping 96 in 2009.
- Shelton, Wash., reached 109 degrees after hitting 107 Sunday, both topping 104 from 2009.
- Stampede Pass, Wash., reached 95 degrees after 93 on Sunday tied the high mark from 2004.
- The Dalles, Ore., reached 118 degrees, topping Sunday’s 114. (Before this stretch, the record was 111 in 1998 and 1992.)
- Medford, Ore., reached 115 degrees, tying the mark from 1946. This breaks the June record for Medford (111) and the state of Oregon (113).
- Troutdale, Ore., reached 115 degrees, topping 112 Sunday and 109 on Saturday. (Before this weekend, the previous record was 108 in 1977.)
- McMinnville, Ore., reached 114 degrees, topping 111 degrees Sunday. (Before this stretch, the max was 110 in 1926 and 1925.)
- Hillsboro, Ore., reached 114 degrees, topping 109 degrees Sunday. (Prior, the highest temperature was 108 in 2006.)
Meanwhile in my neck of the woods, our high was 93°F (34°C) according to a local weather station, but felt like 102°F (39°C) because of the 46% humidity. Our backyard thermometer indicated 101°F (38°C) in the shade.