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    Brett Anderson

    Weather Pattern Highlights this Week

    7/29/2013, 9:53:09 AM

    A quick breakdown of the expected weather pattern for Canada and the U.S. this week.......


    590x393_07291816_week


    ---Temperatures will continue to average cooler than normal as a whole this week from the central Prairies to Ontario and eventually Quebec. The coolest part of this pattern will be centered from Thursday through the weekend with temperatures averaging 3 to 6 C. below normal, especially with the daytime highs.

    --Still no measurable rainfall for Vancouver and Victoria, BC, this month, and it looks like that string will continue into at least Wednesday, though an upper-low will approach from the southwest later this week and may create enough instability for showers Thursday and again Friday, though the best chance of rainfall will be across the interior and in the mountains. Even if it does not rain, the upper low will bring cooler weather to interior BC later in the week.

    --A building high pressure ridge will produce much-above normal temperatures from interior Alaska to northern BC this week and possibly into next week as well. The pattern will also be a fairly dry one compared to normal.

    --The humid conditions that have dominated across Atlantic Canada will be replaced by a drier, more comfortable air mass by midweek. However, it won't last too long as it moistens up again over the weekend.

    --A fairly strong front will likely bring widespread showers and thunderstorms to Ontario and southwestern Quebec Thursday. At this point, it looks like the threat for severe thunderstorms will be low as the combination of cloud cover and marginal dew points will limit the amount of instability needed for strong, damaging thunderstorms.

    --It still looks like there will be a pattern change across North America sometime around Aug. 10 or so. This pattern change would possibly lead to a return to warm weather across south-central and southeastern Canada, so don't close the pools quite yet!

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    I will post the latest ECMWF long-range model interpretation later this evening.

    The views expressed are those of the author and not necessarily those of AccuWeather, Inc. or AccuWeather.com

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