9:24pm UPDATE: Severe Thunderstorm Watch will expire by 10pm for Montreal. About 25mm of rain has fallen since 7:30 here on L'Ile Perrot. Most of the strong storms are south of Montreal to the US border and into the Champlain Valley. The activity will continue to move south and east and conditions will calm down shortly.myweather.com radar image at 8:10pm this evening shows storms moving across Ile Perrot and onto Montreal island. A severe thunderstorm warning is in effect for the region. They should move south and east of the city by 9pm.
Lightning and thunder along with heavy rain is spreading across the Montreal metro region at 8pm. Lines of heavy thunderstorms have been affecting the region and should continue moving northeast along a cold front for about the next hour or so. The storms have produced some rotation so an isolated tornado is possible. Tornado warnings were issued for Laval earlier this evening, but have since expired. No damage has been reported so far.
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