Friday, 24 July 2015

More showers and storms expected in southern Quebec

Numerous showers and thunderstorms developed in southern Quebec on Wednesday and Thursday including this one near Vaudreuil. The trend will continue today. (ValleyWX)
An upper level low spinning over southern Quebec has maintained a pool of cool and unstable air over the region. Montreal has had very unsettled weather the last 48 hours, with numerous showers and thunderstorms. The trend will continue today with showers and thunderstorms scattered about all day. The clouds and precipitation will help to keep temperatures cooler than normal in the low to perhaps middle 20's. Additional rainfall may be significant is some of the storms, adding to the impressive totals so far this month. Small hail is also possible. I have measured 104.5mm (over 4 inches) of rain here at my home on L'Ile Perrot, 105.9mm has fallen at Sainte-Anne-de-Bellevue with 87.2mm at Trudeau Airport. The clouds and frequent rain has meant a cooler than normal July for the city.

Warmer air will nudge the upper level low northeast and out of Quebec this weekend. (AccuWeather)
Looking ahead, high pressure will briefly clear the skies over Montreal and southern Quebec tonight into Saturday with sunshine forecast, lows of 16C (60F) and highs up to 26C (79F) Saturday. By Sunday the heat and humidity will be on the rise with temperatures climbing into the upper 20's and even low 30's by Tuesday. Numerous showers and thunderstorms will be around Sunday and next week in the warmer more humid air mass.

El Nino
The much talked about El Nino, that ribbon of warmer than normal water in the Pacific Ocean off the South American coast, continues to upset weather patterns across the globe. The current El Nino is showing no signs of leaving anytime soon and may be strengthening. It has led to a very unsettled and at times destructive weather pattern across North America from heavy rain and flooding in California to intense wildfires in northern Saskatchewan. El Nino has also been responsible for an increase in severe weather across central portions of the continent as well as cool weather for Atlantic Canada and Quebec.

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