Thunderstorm in Montreal - August 23rd-August 24th, 2020
***I STRONGLY RECOMMEND USING EARPHONES/HEADPHONES (BASS AMPLIFIED) TO HEAR THE MORE NATURAL SOUND OF THE RAIN***
A video compilation showing a strong multicell thunderstorm that affected largely areas just South of the island of Montreal, but also briefly the extreme Southern portion of the West Island.
The thunderstorm was associated with a stationary front and shortwave trough. Deep shearing fields were fairly weak, as were mid-level cooling rates, but the degree of shear was sufficient for at least some organized convection for the late-evening to overnight period. Due to weak wind shear, thunderstorms were fairly slow-moving. Instability was largely maximized by very high humidity and significant solar heating following early-morning heavy rainfall and cloud cover associated with a stationary warm front and shortwave at that time. Mid-level cooling rates also reached marginally steep standards before weakening by late-afternoon, increasing instability.
The footage first highlights the early-day heavy rainfall, followed by a late-afternoon distant thunderstorm, and then the late-evening to early-overnight thunderstorm that briefly affected the Southern portion of the West Island.
Footage was taken in SW Pierrefonds, located in Montreal’s West Island. Radar imagery is courtesy of NOAA.
~Trav.~
Пікірлер: 3
Wowowo
Another great video! I hope the next few weeks will offer a sort of Grand Finally thunderstorm similar to the end of a fireworks show! I may have asked this before, but is most lightning usually within the cloud in this video? What percentage of lightning stays within the cloud usually compared to hitting the ground? Also, does lightning usually start from the ground and travel towards the cloud or vice versa? Hope you catch more storms.
@Rain1290
3 жыл бұрын
Hi Sky Of The Universe, Thank you for your viewing and kind comment! And no, you did not ask that question previously, so I would be happy to answer it for you to the best of my ability (well, even if if you asked it before, I would be happy to answer again Haha)! Most lightning discharges occur inside the cloud, as with the thunderstorm in this video. On average, about 75% of discharges occur inside the cloud (i.e. intra-cloud lightning), lightning that starts inside the cloud and then moves out into the neighboring air (i.e. cloud-to-air lightning) and to a nearby cloud (i.e. cloud-to-cloud lightning). The other 25% comes from those that emerge from the cloud and extend to the ground (i.e. cloud-to-ground lightning). Therefore, on average, one in every four discharges is a cloud-to-ground strike. But yes, in the cloud-to-ground type of discharge, as the name implies, the lightning starts from the cloud (usually the lower to mid-section of the thunderstorm) and touches the ground. Another type of cloud-to-ground strike is that that emerges from the top of the thunderstorm and extends to the ground - these are called "positive" strikes and are a part of the cloud-to-ground family, but they are the most powerful member. In rare cases, lightning can actually begin from the ground and work its way upward to the cloud (these are called ground-to-cloud lightning). And, yes, I hope that we can enjoy at least a few more thunderstorms before this year is done (I suspect that we will, especially into the beginning of September) :) ~Trav.~