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Active pattern with several chances for snow

Weather forecast for week of Oct. 28, 2013

As has been the case for the last few forecasts, they start off pretty much on track and then things seem to fall apart for the second half. This happened once again with last week’s forecast. The system that looked as if it was going to bring the first snows of the season took a much different path and ended up bringing snow to a good part of Alberta last weekend. The low then tracked by to our south keeping us high and dry. What we were not able to avoid, however, was the shot of cold air behind this low, but with no snow cover, we didn’t see the expected bone-chilling cold.

Luckily for us the area of arctic high pressure will move off to the east fairly quickly and we should see temperatures return to more seasonable values by the middle of this week. The weather on Halloween looks to be fairly nice, with the high expected to be in the 5 to 8 C range, falling to just above zero by late evening. Winds also look to be fairly light, but wind forecasting this far out is pretty unreliable.

We’ll see a bit of a cool-down on Friday as a cold front slides through. Temperatures will then moderate a little over the weekend as an area of low pressure develops to our west. This low is currently forecast to move quickly through the southern Prairies late in the weekend. Depending on the exact timing and track of this system we could see either all snow, or rain changing to snow. The best chances for precipitation look to be over central regions. It doesn’t look like there will be large accumulations with this system, but a couple of centimetres is possible.

To start next week, arctic high pressure will try to build southwards behind this low, but southerly winds ahead of another area of low pressure developing off of the West Coast will likely keep the coldest air to our north.

Usual temperature range for this period

Highs: -1 to 11 C Lows: -11 to 1 C

Probability of precipitation falling as snow: 60 per cent

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