Thunderstorm in Montreal - October 7th, 2020
***I STRONGLY RECOMMEND USING EARPHONES/HEADPHONES (BASS AMPLIFIED) TO HEAR THE MORE NATURAL SOUND OF THE THUNDER***
A video compilation highlighting a pair of isolated non-severe thunderstorm clusters that affected the island of Montreal during the early-afternnon, and then during the mid-afternoon period. The first thunderstorms affected Lachute and Rigaud-Saint-Lazare, and near Huntingdon, while the second set of thunderstorms affected those areas, and eventually Western portions of the island of Montreal and Western Laval towards extreme North-central parts of the island of Montreal.
Although substantially cloudy during the morning period, thunderstorms began to develop in response to steep mid-level cooling rates and strong lift ahead of a shortwave trough series. Some lift ahead of a pair of cold fronts also helped with the overall lift that had been present. Despite limited moisture/humidity, the steep mid-level cooling and eventual brief solar heating prior to the second thunderstorm cluster, unseasonably high instability managed to materialize. Furthermore, strong deep-level shearing fields allowed for some sustained, organized and fast-moving deep convection.
The video highlights the thunderstorms forming in the distance before producing heavy rain over my area, at the Western end of the West Island. Occasional thunder was eventually heard with the second thunderstorm cluster, and some lightning was eventually observed over the West Island. Heavy rain eventually ensued. A “whale’s mouth” formation was observed (by 4:01 into the video), as represented by the roiling/turbulent feature of the updraft area.
Footage was taken from SW Pierrefonds, located in Montreal’s SW West Island. ***Note that radar imagery is missing for the second cluster of thunderstorms, as revealed when the radar is forwarded at the beginning of the video.
~Trav.~
Пікірлер: 6
good job as always friend
@Rain1290
3 жыл бұрын
Thank you very much, Alain!
Wow I saw the sky get dark in the downtown core near Atwater and then the sky opened up in a downpour. Is it rare to get thunderstorms at this time of year? Or this kind of the last bang of the thunderstorm season? I was also wondering if we should expect wind storms around this time of year? I notice most wind storms occur in spring and autumn. Thanks Travis for another great year of thunderstorms.
@Rain1290
3 жыл бұрын
Hi Sky Of The Universe, While it is rare to observe thunderstorms during October and later, they have seemingly become less rare for both the island of Montreal and this general area. For October, specifically, since at least 2010, the island of Montreal (not necessarily always the entire island) observed at least one thunderstorm day, with the exception of October 2010, October 2012, and October 2013. This may be that our Fall seasons have been trending warmer, increasing the chance for thunderstorms to develop in Fall and, thus, extending the thunderstorm period. 2019's October 1st featured some rather strong thunderstorms. This Saturday (October 10th) may also feature potentially organized thunderstorms during the mid- to late-afternoon period, so we will have to monitor that. :) That could be the last thunderstorm day, but then I suspect that the warmer than normal conditions will favorably carry on into November (for the first time in 4 years). This could, therefore, open windows of opportunity for thunderstorms to develop into November, although the chance would still be slim by that point. And yes, you're right, strong wind events tend to be most prevalent during Spring and Fall. Winter often features these wind events, as well. One reason for this is the larger temperature variability that frequently occurs during mid-Fall to mid-Spring. In late-Spring to Summer (May-September), especially in July, temperatures are much more uniform, and so these wind events are less common. However, although more localized, these magnitude of winds may still unfold during Summer time because of strong to severe thunderstorms, as opposed to the winds being driven by a broader-scale temperature gradient (i.e. a substantial thermal swing). And you're very welcome, too, for the footage for this year! ~Trav.~
When is the thunder
@Rain1290
3 жыл бұрын
Hi Matthew - the thunder can be heard by 8:15 into the video and onward (best to use bass amplified earphones/headphones while listening) :)