There are two possible sources of this extreme jump in peak temperatures. 
In the most realistic statistical analysis the event is estimated to be about a 1 in 1000 year event in today’s climate. This makes it hard to quantify with confidence how rare the event was.
The observed temperatures were so extreme that they lie far outside the range of historically observed temperatures. Based on observations and modeling, the occurrence of a heatwave with maximum daily temperatures (TXx) as observed in the area 45–52 ºN, 119–123 ºW, was virtually impossible without human-caused climate change. Negative values certainly do not include the heatwave and have therefore been deleted. Note that some stations do not have data up to the peak of the heatwave yet and hence underestimate the event. Fiure 1: Station data anomalies of the 2021 event relative to the mean of the highest daily maximum temperature of the year in the time series. Using published peer-reviewed methods, we analysed how human-induced climate change affected the maximum temperatures in the region where most people have been affected by the heat (45–52 ºN, 119–123 ºW) including the cities of Seattle, Portland, and Vancouver (with well over 9 million people in their combined metropolitan areas). Scientists from the US, Canada, the UK, the Netherlands, France, Germany and Switzerland collaborated to assess to what extent human-induced climate change made this heatwave hotter and more likely. The full extent of the impact of this exceptional heat on population health will not be known for several months. Currently available mortality estimates of at least several hundred additional deaths are almost certainly an underestimate. 
Heatwaves are one of the deadliest natural hazards and this heatwave affected a population unaccustomed and unprepared for such extreme temperatures, for instance with most homes lacking air-conditioning.
The exceptionally high temperatures led to spikes in sudden deaths, and sharp increases in hospital visits for heat-related illnesses and emergency calls. Shortly after setting the record, Lytton was largely destroyed in a wildfire. states of Oregon and Washington and the western provinces of Canada recorded temperatures far above 40✬ (104 ✯), including setting a new all-time Canadian temperature record of 49.6✬ in the village of Lytton.
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