High Quality Content by WIKIPEDIA articles! On August 7th, 1979, several tornadoes touched down and devastated the area of Woodstock, Ontario, especially the southern end of which suffered the most intense destruction. Two people died, 142 were injured, and many homes were destroyed. A relatively cool and dry airmass was being pushed in from the north by means of a cold front, into warm and unstable air from the United States. Severe weather had already affected northeastern Ontario the evening before with this same cold front; during the late morning of the 7th the front had stalled across the Bruce Peninsula, where newer convection produced a couple of weak tornadoes near the towns of Wiarton and Grand Valley. (A large outflow boundary associated with these storms may have interacted with the lake breeze fronts, thus sparking these tornadic supercells).

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