I present here a video compilation of a thunderstorm that quickly went through the West Island of Montreal during the mid-afternoon period.
Thunderstorms were associated with a cold front, following post-sunrise thunderstorms in the Southern tier of this general area (i.e. in Huntingdon-Ormstown and Napierville-Saint-Michel corridors/sub-areas) that were associated with a pre-frontal shortwave trough. While this early-day convection produced some persistent cloud cover, this cumulus cloud deck eventually transitioned to broken skies and allowed for eventually widespread thunderstorms to form as lift became enhanced. The instability increased substantially, despite modest mid-level cooling, reaching particularly high standards around the island by mid-afternoon. Once this instability was realized, some thunderstorms reached maturity in just minutes after infancy. Deep SW shearing fields also meant fast-moving long-sustained thunderstorms, with a locally strong damaging wind risk as the primary hazard. A veering component within the boundary layer also meant that the more discrete thunderstorms would offer an improved weak tornado risk. Owing to very high humidity, rainfall was very heavy with these thunderstorms, as shown blowing in a sweeping motion with the outflow in the video. While there might have been additional thunder during the heavy rainfall, at least one thunder was delightfully captured over the West Island, as heard near the end of the video. The discrete supercell that affected Mascouche also led to a tornado in the area (likely to be rated as either EF1 to EF2 in intensity). A second tornado might have also struck Southern Quebec, in Saint-Bernard (just South of Quebec City). Severe thunderstorm watches were released by morning, and Severe Thunderstorm Warnings were also given by mid-afternoon, especially at the Southern tier of this general area.
Footage was taken in SW Pierrefonds, located in Montreal’s West Island. Radar imagery is courtesy of NOAA.
~Trav.~
Негізгі бет Thunderstorm in Montreal - June 21st, 2021
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