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DarkSky
06-06-2011, 09:49 PM
AWCN11 CWTO 070126
WEATHER SUMMARY FOR ALL OF SOUTHERN ONTARIO AND THE NATIONAL
CAPITAL REGION ISSUED BY ENVIRONMENT CANADA AT 8:36 PM EDT MONDAY 6
JUNE 2011.

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==WEATHER EVENT DISCUSSION==

AN ENVIRONMENT CANADA STORM DAMAGE SURVEY TEAM HAS COMPLETED AN
INVESTIGATION OF THE DAMAGE FROM A SERIES OF STORMS WHICH AFFECTED
AREAS TO THE EAST OF LAKE HURON ON THE MORNING OF SATURDAY JUNE 4.
THE STORMS WERE PARTICULARLY SEVERE AROUND MID MORNING AS THEY
TRACKED SOUTHEAST FROM PORT ELGIN. THE SURVEY TEAM FOUND ISOLATED
DOWNED TREES IN A BROAD SWATH ROUGHLY 35 KM LONG AND LOCALLY 5 KM
WIDE FROM NORTH BRUCE (SOUTH OF PORT ELGIN) TO NEAR SCONE (JUST
SOUTHEAST OF CHESLEY). LOCALES AROUND THE TOWN OF CHESLEY (ABOUT 30
KM SOUTHEAST OF PORT ELGIN) SUSTAINED THE MOST DAMAGE WHERE A FEW
BARNS (JUST NORTH OF CHESLEY) WERE SEVERELY DAMAGED. THE DAMAGE
CONSISTED OF PARTIAL ROOFS LIFTED OFF AND SOME COLLAPSED WALLS. THE
WORST DAMAGE WAS A BARN A FEW KILOMETRES NORTH OF CHESLEY WHERE ONE
WALL WAS LEFT STANDING WHILE MOST OF THE STRUCTURE WAS BLOWN DOWN
WITH DEBRIS SCATTERED TO THE SOUTH ACROSS THE PROPERTY AND BEYOND.

ALL THE DAMAGE (TREES, BARN AND DEBRIS) WAS BLOWN TO THE SOUTH OR
SOUTHEAST INDICATIVE OF STRAIGHT-LINE WINDS FROM A DOWNBURST. A
DOWNBURST IS OFTEN ASSOCIATED WITH SEVERE THUNDERSTORMS WHEN COOL AIR
DESCENDS FROM HIGH UP IN THE STORM TO THE GROUND AND SPREADS OUT
CAUSING DAMAGING WIND GUSTS. DAMAGE FROM THE BARNS INDICATE THE
WINDS BRIEFLY REACHED THE LOWER END OF AN F1 RATING ON THE FUJITA
DAMAGE SCALE, BETWEEN 118 KM/H AND 180 KM/H.

THERE MAY BE A FEW FOLLOW-UP PHONE CALLS TO FINALIZE THE CONLUSIONS
OF THIS INVESTIGATION.

THIS WEATHER SUMMARY CONTAINS PRELIMINARY INFORMATION AND MAY NOT
CONSTITUTE AN OFFICIAL OR FINAL REPORT.

END/OSPC

ParkingLot
06-12-2011, 05:54 PM
damn! That would have been intense...