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I've read their descriptions but still don't understand how they create heat? I always thought it was the 4 corners high that is responsible for our summer time warm waves? Also as a bonus what are Oregon's best summer time warm waves and what were the atmospheric conditions at those times to the best of your knowledge? Just for fun here is the August 1981 heatwave. The first hot weather actually hinted in July 27th according to the Eugene Register Guard archives. https://news.google.com/newspapers?nid=4pF9x-cDGsoC&dat=19810727&printsec=frontpage&hl=en7/27/81. Sizzling weather likely to end Tuesday 7/28/1981: Some Like It Hot And Yesterday was all their's.https://news.google.com/newspapers?nid=4pF9x-cDGsoC&dat=19810728&printsec=frontpage&hl=en Temperatures hit the 100F mark and then some in many parts of Eugene Springfield area Monday although the official high reading was 98 degrees at the National Weather Service station at Mahlon airport.We were one of the few places that didn't reach 100 said Meteorologist Dave Parmenter Here is August 1981 event. August 7th: Passwords for Weekend "It's Hot!" Weather Forecaster Bill Isabell summed up the weekends weather today in a single word "Hot!" https://news.google.com/newspapers?nid=4pF9x-cDGsoC&dat=19810807&printsec=frontpage&hl=enTemperatures were expected to climb to 105 today and Saturday. A large warm air mass stretching as far north as southeastern Alaska is causing the heatwave he said. August 8th. https://news.google.com/newspapers?nid=4pF9x-cDGsoC&dat=19810808&printsec=frontpage&hl=en Sizzling Weekend Predicted For Valley: August 9th: https://news.google.com/newspapers?nid=4pF9x-cDGsoC&dat=19810809&printsec=frontpage&hl=enIt's Hot (103) - and may get hotter. Think that's bad? it was 114 in Medford! Bumper to Bumper Traffic besieged ocean beaches. Patients discharged from hospitals asked to be taken back. August 10th Eugene Sweats Record - 108 Degrees. Fahrenheit One Hundreds Eight That's not the title of a science fiction story with apologies to Ray Bradbury . It's science fact a story that was all too true for the willamette valley residents who on Sunday sweltered through the hottest temperature ever recorded in Eugene. The previous record was 106 set Aug 7,1972. Fahrenheit 108 was a sizzling story of mass migrations to sea level or ski level as people sought cooler climates. Of rushes to buy fans,air conditioners,ice,beer and pop. Of worried water department officials and 'panicked' forest firefighters. And the story continues. At least two or three more chapters of scorching heat will be written in the interior of Oregon forecasters say.