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Heat dome crumples long-standing records, rewrites history (again)

Tuesday, June 29th 2021, 4:06 pm - Lytton, B.C., has done it again and set another new record for Canada's hottest temperature after hitting (47.9°C) on Monday, ousting its previous record that lasted for less than 24 hours.

Lytton, B.C., has topped its own record of having Canada's hottest temperature ever.

For the second day in a row, the British Columbia community has recorded the country's highest temperature on record -- hitting 47.9°C on Monday, surpassing its previous record of 46.6°C set on Sunday. The new Canadian temperature record that was established on Sunday, which previously stood for about 83 years, lasted for less than 24 hours.

This comes amid the extreme and potentially life-threatening heat wave in Western Canada, which is setting new all-time, monthly, and daily records at a rapid pace.

A phenomenon known as a heat dome, something more common to the southwestern U.S, is the cause of this extreme heat. It is defined as an area of intense high pressure, beneath which descending air compresses into layers near the surface, warming drastically as it does so.

NatRecord (2)

British Columbia is where the heat is most extreme, with numerous communities opening cooling centres and initiating other measures to warn the public of the extreme temperatures.

Power grids are likely to take significant hits and a lack of rain in the forecast means the fire danger is on the rise. In fact, BC Hydro reported a new record for peak hourly demand amid the high temperatures.

See below for a look at the temperature records that have been set in Western Canada.

National record: Lytton, B.C. (47.9°C)

Monthly records: Lytton, B.C. (47.9°C), Pemberton, B.C. (40.3°C), Abbotsford, B.C. (39.6°C), Hope, B.C. (39.5°C), Squamish, B.C. (39°C), Victoria, B.C. (35.8°C), Grande Prairie, Alta. (36.1°C), Yellowgrass, Sask. (45.0·C), Midale, Sask. (45.0°C), Hendrickson Creek, Alta. (34.5°C), Jasper, Alta. (37.3°C)

All-time records: Pemberton, B.C (40.3°C), Abbotsford, B.C (41.5°C), Hope, B.C (39.5°C), Squamish, B.C (39°C), Yellowgrass, S.K. (45.0·C), Midale, S.K. (45.0°C), Hendrickson Creek, Alta. (34.5°C), Grande Prairie, Alta. (36.1°C), Jasper, Alta. (37.3°C)


As well, the Fraser Valley reached a temperature above 40°C on Saturday — the first time in history.


Because the heat wave is still ongoing, more records are likely to be established or changed with the hot temperatures moving east into Alberta.

The extreme heat has also reached the Northwest Territories, where Nahanni Butte (Yohin) hit a new all-time high temperature of 38.1°C. Several other locales recorded new daily highs Sunday.

Thumbnail courtesy of Dan Dueck, Abbotsford, B.C.

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