Friday, July 12, 2013

Lower humidity levels today - heatwave starts Saturday

Enjoy the natural air conditioning this morning as temperatures and dew points are much lower in Montreal. I currently have 18C here on L'Ile Perrot, but we were as low as 15C, the coolest this month. More importantly is feels much dryer out there with respectable relative humidity readings. This won't last long so enjoy today with sunshine and 27C. The heat and humidity will build Saturday with highs reaching 30C, but into the 30's for Sunday through Tuesday. It will become sticky and uncomfortable again with the risk of thunderstorms late Tuesday and again Thursday. Humidex readings in metro Montreal will approach 40C early next week, so advisories may be needed. This same type of weather will exist across eastern and southern Ontario as well as northern New England. Overnight lows in Montreal will remain over 20C.

The severe weather late Wednesday afternoon produced Quebec's second tornado of the year. At around 6:15pm an EF-0 storm, the lowest on the scale, occurred northeast of Montreal in Saint-Marc des Carrieres. Other regions in southern Quebec reported wind gusts to 100km/h with some trees down near Drummondville as well as north end Montreal. Hail was observed across the lower Laurentians.

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