(CNN) As the heat wave that has left at least three dozen people dead in Canada, the northeast US and Kansas recedes, heat is building in the western US and is likely to add to wildfire concerns.

Over 90 million people were under some sort of heat watch, warning or advisory, including in the Northeast, the Mississippi and Ohio Valleys and the Southwest.

There have been 33 heat-related deaths in Quebec in the past several days, according to Marie-Claude Lacasse with the Ministry of Health, Quebec. Eighteen of those deaths were in Montreal, authorities said Thursday.

For the eastern US, the heat will begin to fade on Friday. Temperatures in parts of the Great Lakes and much of eastern Canada will even drop into the 70s.

But the temperature will rise in the West into the weekend. Los Angeles will see highs at or near 100 on Friday and Saturday.

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