This is a video of a rapidly developing severe thunderstorm (just to our South) that quickly moved off to the ESE by late afternoon-early evening.
What a birthday treat this was for me (for a second year in a row), and I had been expecting severe weather to develop on this day across much of southern Quebec, but it was just a matter of which locations would receive storms - fortunately, the island of Montreal was one of them as storms moved in from the NW in clusters of multi-cell severe t-storms. Large amounts of surface CAPE (nearly 3000 J/kg), dewpoints at extreme levels (25 C), good low to mid level lapse rates, good wind shear values at various depth layers above the surface, and a moderately strong cold front from the NW led to a strong thunderstorms to develop by late afternoon into the evening hours. While we did not receive large amounts of rain (being skimmed by the storm as it passed to the northeast, we were treated with a spectacular lightning display. This was taken in SW Pierrefonds, located in Montreal's West Island.
~Trav.~
Негізгі бет Severe Thunderstorm in Montreal - July 21st, 2011
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