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Heavy rain and fall-like temps invade parts of eastern Canada, while record breaking heat and smoke advisories remain in place across the west. Here's your weather briefing for Wednesday, August 13.

Five things you need to know about Wednesday, August 13

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    Andrea Bagley
    Digital Reporter

    Wednesday, August 13, 2014, 7:27 AM - Wondering what you missed overnight or what you can expect for the day ahead? 

    Here's your weather briefing for Wednesday, August 13. 

    1. Heavy rain soaks western New Brunswick

    Environment Canada issued a special weather statement early Wednesday warning of heavy rain over extreme western New Brunswick.

    "Rainfall amounts of up to 25 millimetres are currently forecast by Thursday evening over extreme northwestern sections of the province," EC says. "However depending on the intensity of the trough, the track and speed at which it will cross the region the rainfall amounts could be significantly higher and possibly in excess of 50 millimetres."

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    "Breezy conditions combined with an onshore flow are keeping temperatures seasonal for the Maritimes and below seasonal in Newfoundland," adds Weather Network meteorologist Tyler Hamilton.

    2. Heavy rain, fall-like temps hit Ontario

    Storms fired up across parts of Ontario Tuesday, prompting severe thunderstorm watches and warnings.

    "These intense line of thunderstorms met the severe storm criteria because of significant hail cores along with heavy rains increasing the threat of flash flooding," says Hamilton. "The storms also exhibited signs of 'training,' or when a line of storms continues to track over the same areas of land."

    Radar estimated rainfall amounts were showing regions experiencing rates as high as 50 mm per hour.

    "Areas west of Midland were closer to 75 mm for storm totals," Hamilton adds.

    Rainfall warnings remain in place for portions of southern and northern Ontario Wednesday with additional amounts up to 50-60 mm possible through Thursday. Localized flooding in low-lying areas is possible.

    "Unseasonably cool temperatures will also plague portions of Ontario for Thursday and Friday," says Hamilton. "There's a possibility that North Bay may record a single digit high for Thursday with the nation's capital forecasting a temperature of 14 degrees for Thursday, 11 degrees below seasonal norms."

    3. 50+ mm of rain to drench southern Quebec

    The same low pressure system that's impacting Ontario will continue to bring heavy rain and cool weather to southern Quebec.

    "These conditions will move slowly toward the centre of the province today," says EC in a rainfall warning issued Wednesday. "50 to 90 millimetres of rain are expected until Thursday for areas along the St. Lawrence between Montréal and Charlevoix, with the most significant amounts over the Laurentians foothills."

    Heavy downpours can cause flash floods and water pooling on roads. Localized flooding in low-lying areas is possible, officials warn.

    4. Record temps in Alberta, thunderstorm risk continues across the Prairies

    Several Alberta communities wrote a new page in the record book Tuesday with temperatures soaring above the 30 degree mark.

    That includes the city of Medicine Hat, which became the country's national hotspot with a daytime high of 34.7°C.

    "There's a general thunderstorm risk for a large portion of the Prairies today," Hamilton says. "Isolated severe storms are possible in the Okanogan, and portions of Alberta and Saskatchewan."

    5. Air quality advisory for Metro Vancouver

    Forest fire smoke has been creating a major health risk across B.C.'s Interior, including Metro Vancouver and the Fraser Valley regional district.

    "Smoke concentrations will vary widely as winds and fire behaviour change," the statement reads.

    "Metro Vancouver has also issued an air quality advisory for Metro Vancouver and the Fraser Valley regional district because of high concentration of fine particulate matter, primarily due to smoke from fires in Washington."

    Persons with chronic underlying medical conditions should postpone strenuous exercise until the advisory is lifted, officials warn.

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