Tuesday, 19 May 2015

More thunderstorms today for Montreal then much cooler

Thunderstorms produced flooding in portions of north end Montreal on Monday night. (Twitter@CJAD800)
It was a very warm and humid holiday Monday across southern Quebec with temperatures soaring to around 30C. I recorded 32.4C (90F) here On L'Ile Perrot, while Trudeau Airport reach 29.3C (85F), and St. Anicet hit 31.8C (89F). Strong thunderstorms fired up late in the afternoon over Eastern Ontario and the upper Ottawa Valley. Widespread watches and warnings were posted including a tornado warning for portions of eastern Ontario. Some rotation was observed in several of the storms including one that ripped trees out of the ground near Maniwaki, Quebec. As the storms pressed into southern Quebec small hail, very heavy rain and lots of lightning was observed. I recorded 6.6mm of rain here on L'Ile Perrot, around 0.25" in one of the storms late last evening. The strongest of the thunderstorms missed Montreal moving north and southeast of the city. However the ones that did occur were enough to drop 10mm of rain at the airport and as much as 30-35mm downtown in less than 1 hour causing some flooding.

Strong thunderstorms today
Today a sharp cold front will bring an end to this most recent warm spell as it moves across the St. Lawrence Valley later this afternoon. In advance of the front, gusty southwest winds will reach 60km/h in Montreal with a warm, muggy high of 25C (77F). Thunderstorms will develop by 1pm in southern Quebec as well as New York and Vermont and move northeast across the region. Some of the storms may produce small hail and strong winds up to 100km/h. The weather should clear late tonight or early Wednesday followed by dry but much colder weather for the balance of the week. High temperatures will only be around 15C (59F), with lows of 5C (41F). We may even see a little frost by Friday night in areas away from the city.

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