The 2018 North American heat wave was a heat wave in some parts of North America. At least 70 deaths in Quebec were heat-related. Eighteen states between Michigan and New Mexico issued heat advisories to over 60 million people.
From July 1 to July 6, 2018, the air temperature consistently rose above 35 °C (95.0 °F) in parts of Quebec and Ontario. The humidex value for Ottawa on Canada Day between noon and 3 pm was 47, the highest ever recorded in the city. The heat wave also affected the Maritimes, with the humidex value hitting a record-breaking 45 in Greenwood, Nova Scotia.. On July 4, Montreal emergency services reported 1200 calls per day about the heat, up 30% from prior busiest days.
As of July 10, 74 people, most of them already ill, had died heat-related deaths in Quebec. The province's death toll is much higher than others because of its looser rules for attributing death to heat. In Ontario, where only accidental deaths directly caused by heat are counted, the coroner's office is investigating three possible cases.
On July 6, temperatures in southern California went over 110 Fahrenheit (43° C). Santa Ana and Ramona hit respective record highs of 114 degrees F (46° C) and 117 degrees F (47° C).
On July 7, 34,500 Los Angeles Department of Water and Power customers (2.5% of its base) experienced power outage, some for up to 24 hours. The day prior, peak energy demand set a new record for any July day in the city, at 6,256 megawatts.
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