June 8th 2007

"Bowing Squall Line"

General Analysis:
Deep layer shear, good cape and generally supportive wind fields made for possible supercells but as things progressed all the storms went linear along the cold front and produced a large bowing squall line possibly aided by mid level most air around at around 500 - 400 mb.

 

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Patrick and I headed north towards Shelburne where storms were initiation and the best conditions for supercells and isolated spin ups were possible. This storms produced a near 70 DBz core just east of Shelburne.
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Fresh storms were going up along outflow and this one happened to be the best suited with good strong SW inflow that was very warm.
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The storm matured and dropped a core just to our NE, we never did get any hail but there were some huge drops of rain from melted hail aloft.
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The storm really geared up for a minute or two produced some lowering like features and a core spike of near 70 DBz but eventually got sucked into a storm cluster to the north and went linear.
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We decided to fall back south since things to the north began to fall apart and become outflow dominated, here you can see two storm cells, a northern cell closer to the horizon and a developing cell along outflow which spiked a 60 DBz core about 2 or 3 minutes after the photo.
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Here is our relative position with the radar, GPS and spotter network overlaid. Since everything to the north was going linear and becoming garbage with core dumps we decided to fall south and intercept the squall line coming in from the London and KW area.
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The line began to accelerate like crazy as it neared us and there was a unique inverted bulge globe type thing with 55+ DBz returns rapidly heading out way. We knew there would be wind, it was just a little stronger than expected.
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The trees look blurred for two reasons, the dark conditions required a slower shutter and secondly the first gusts of wind were swaying them all over.
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As we headed south on Mississauga Rd Patrick yells "debris cloud!" and I am thinking "huh?" only to look up and see a 100 - 200 meters tall dust cloud racing up and to the east.
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We pulled off and watched and twigs and leaves blew by us, but the strongest winds seemed very localized and were really effecting the area 100 meters to our south directly in front of us.
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Watch the video to see all the drama!

Big WMV - chase/video/June_8th_2007_big.wmv

Small WMV -chase/video/June_8th_2007.wmv

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The strong winds raising the dust cloud managed to topple over this sign but squeezed between the trees and poles just missing them.
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The power was out just down the road at this intersection.
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Tree damage in Toronto (Eglinton & Harvie Ave)
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Tree damage on my street at a friends house
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Martin Grove & Forest Dr, not sure what happened here but it could have been lightning but there was a ton of leaf debris around so it might have been wind.
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At the top of my street this poor tree could not take the wind!
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Another local street roughly 700 meters from my home.
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The odd house had damage to the roof from blown away shingles but this one actually had some real damage!

 

VIDEO

Big WMV - chase/video/June_8th_2007_big.wmv

Small WMV -chase/video/June_8th_2007.wmv

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Strongest winds between 4:25pm - 4:27pm (according to GPS)

Pink Zone - width of strongest winds and dust cloud

 

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