If you are wondering, 20.4°C was observed at 700-mb in the 0000 UTC (1800 MDT) sounding, which is also the highest observed in the sounding records (the old record was 20.2°C).
It really was a dry heat. At the time of the 109°F, the dew point was 26°F, resulting in a dewpoint depression of a remarkable 83°F and a relative humidity of 6%.
Stay hydrated my friends.
Pretty amazing considering how long the 107° record has stood and how many times it has been tied over the years. I was in Portland for the 116° heat dome in 2021 and that actually burned the western sides of the native firs, took a couple years to subside with the new growth.
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