***I STRONGLY RECOMMEND USING EARPHONES/HEADPHONES (BASS AMPLIFIED) TO HEAR THE MORE NATURAL SOUND OF THE RAIN***
A video compilation showing a series of three (3) thunderstorm events that affected the West Island of Montreal (and with some nearby afternoon developments) during August 24th to early-predawn August 25th. Thunderstorms were largely non-severe, but some became quite strong during the mid-afternoon to early-overnight. Thunderstorms were associated with a series of weak shortwave troughs throughout the day, as well as a stationary front for the morning thunderstorms (which only affected the West Island-Vaudreuil, the Rigaud-Saint Lazare, South Shore, and Lachute-Sainte-Placide corridors). Deep shearing fields continued to be weak, overall, but sufficient enough for organized convection. Following early-day cloud cover from early-day convection, the sun was able to break through the cloud deck and, together with very high humidity and steep mid-level cooling rates, enhanced instability. Instability for the afternoon of August 24th was among the largest so far this year in this general area. A Severe Thunderstorm Watch was released early (and then removed by late-evening, though it was, as I anticipated, re-introduced during the late-predawn), and a warning was given for the Mirabel area during the mid-afternoon, even though that thunderstorm weakened considerably before reaching there from Rigaud-Hudson.
The footage first shows the brief morning thunderstorm (not that I accidentally deleted a clip containing one of the thunder sounds…and I missed the first thunder, as that is what woke me up to begin with - a somewhat recurring theme of being unable to capture key highlights this year Haha), followed by a collection of photos of organized thunderstorms in East Ontario during the early-afternoon, and then Rigaud-Hudson by mid-afternoon. Following this, isolated to eventually scattered thunderstorms began to develop to the South for the evening under a continued strongly unstable and progressively strongly sheared environment by late-evening. By late-evening, a new thunderstorm that originated over the SW West Island began to mature quickly and soon produced some high-intensity lightning as it progressed ESE, including producing a few bolt-from-the-blue (i.e. positive cloud-to-ground) strikes. The afternoon to early-overnight thunderstorms were governed by shear axes enhancing lift and a series of weak shortwaves, while late-overnight thunderstorms (which affected the East End and closely surrounding locations to the East and NW of there) were caused by largely a sharp cold front.
Footage was taken in SW Pierrefonds, located in Montreal’s West Island. Radar imagery is courtesy of NOAA.
~Trav.~