Friday, 29 May 2015

Major cool down from Saturday to Sunday in Montreal

It will feel like mid July on Saturday in Montreal and late April on Sunday as a cold front sweeps through Quebec and Ontario. (
A strong cold front will sweep through southern Quebec late on Saturday bringing in an unseasonably cool air mass for Sunday. For Friday, high pressure will be in control of our weather. After a very cool start here on L'Ile Perrot, it is currently (at 6am) 9C (49F), temperatures will rebound rapidly up to 27C (81F) by this afternoon. Skies will turn cloudy overnight but it will remain warm and muggy with a low near 20C (68F). On Saturday clouds along with showers and afternoon thunderstorms will dominate the day. Temperatures will be warm and it will be quite humid with a high near 29C (85F). Some of the thunderstorms may be strong with heavy rain the main threat. Timing is everything with thunderstorms and the focus once again for severe storms may be just to the south and east of Montreal as it was on both Wednesday and Thursday.

The cold front should clear southern Quebec by midday Sunday leaving us with very chilly air to end May. High temperatures will struggle to make it to 16C (60F) on Sunday and overnight lows into Monday will drop into the single digits. The normal high should be 22C (72F). There may even be scattered frost well north of the city and across the Adirondacks, and Townships. Temperatures will slowly warm into next week with above normal readings once again by Wednesday.

On Thursday, May 28, scattered showers and thunderstorms formed once again over southern Quebec, but the bulk of the severe weather was well east of Montreal. A few of the heavier showers had gusty winds in the city through the mid afternoon. Around 7mm of rain fell at Trudeau airport in Dorval, while I measured 3.4mm here on L'Ile Perrot.

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