Clues to the October weather pattern
Before we get to the long-range stuff, the weather across much of eastern Canada will be more like August through the first half of next week with temperatures well above normal and record highs being challenged. In the west, we have seen pictures of new snow cover in some of the higher elevations.
<u>Temperature departures are in degrees Fahrenheit</u>
<img src="https://vortex.accuweather.com/adc2004/pub/includes/columns/miscellaneous/2017/590x331_09221506_warm.jpg"/>
In addition, rainfall will be almost non-existent across a large portion of the east due to this blocking pattern.
<img src="https://vortex.accuweather.com/adc2004/pub/includes/columns/miscellaneous/2017/590x331_09221506_dry.jpg"/>
Changes will arrive the second half of next week as a front arrives and eventually sends temperatures back to normal for the end of the month. This front will also play a role in accelerating Maria out to the northeast (over the north Atlantic) late next week. Maria will probably get partially absorbed by this front and lose tropical characteristics. The result could be some downpours to Atlantic Canada toward the end of next week, but not much more than that as strong wind shear will greatly disrupt the inner core of Maria.
For October, there are signs of widespread blocking over the far north, which if true, would likely keep most of the real chilly air on the other side of the pole but leave room for slow-moving upper lows that produce their own pockets of cooler and wetter weather for the United States and southern Canada, while areas away from these upper lows stay dry and rather mild.
<img src="https://vortex.accuweather.com/adc2004/pub/includes/columns/miscellaneous/2017/590x449_09221508_sep22a.png"/>
<img src="https://vortex.accuweather.com/adc2004/pub/includes/columns/miscellaneous/2017/590x449_09221509_sep22b.png"/>
<img src="https://vortex.accuweather.com/adc2004/pub/includes/columns/miscellaneous/2017/590x449_09221510_sep22c.png"/>
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