A high-pressure system has firmly established itself over part of Eastern Canada.
This atmospheric phenomenon heralds the return of good weather and cold temperatures to the region. The remarkably potent high-pressure area that is expected to peak during the day on Saturday.
This system is unique in that it could surpass a record that is over forty years old!
SEE ALSO: Filmmakers capture Great Lakes whitefish in rare spawning event
It is during winter that anticyclones (clockwise movement around a centre of high atmospheric pressure) reach their highest pressure, and this one is poised to exceed an old mark set in December 1983.
Ontario and Quebec high pressure records – Dec. 13, 2024
Depending on the models, the pressure could surpass 1050 hectopascals on Saturday.
High atmospheric pressure does have certain advantages. In particular, it can act as a shield against the passage of atmospheric disturbances and prevent the formation of clouds.
DON’T MISS: Want a white Christmas? These Canadian cities have the best odds
However, pollutants can more easily accumulate in the air, leading to the formation of smog in urban areas.
Winter high pressure impact explainer graphic
The pressure records in December for Quebec and Ontario range between 1046-1049 hectopascals.
For Montreal, the data shows that the maximum pressures were reached around forty years ago. The all-time record in Montreal was set in February 1981.
This article was translated from MétéoMédia, The Weather Network’s Quebec-based sister station.