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Temperature rollercoaster set to continue for the West


Brad Rousseau
Meteorologist

Thursday, October 18, 2018, 6:00 PM - The high amplitude upper air pattern in place across the west has led to some contrasting temperature records across British Columbia, Alberta, and Manitoba. 

This pattern is what is responsible for the contrast, with a deep upper level trough in place across the east, and a stout upper level ridge setup over B.C., Alberta, and up into the Yukon and Northwest Territories. The trough allowed for Arctic air to flood in across northern Manitoba which lead to some new early-morning low records. 

The ridge is allowing warm Pacific air to flood in across the west which lead to record highs across the region on Wednesday afternoon, as temperatures soared into the high teens to low twenties.

Through the weekend into early next week this pattern is set to continue across the country, with a stout ridge poised to be in place across the west. For now, temperatures through B.C., Alberta, and Saskatchewan are expected to be sitting in the low to mid-teens for this period. 

Tuesday does have the potential to see afternoon highs make another run at breaking into the twenties across Alberta and perhaps southwestern Saskatchewan as the strong upper ridge starts to shift eastward a little more.

On Tuesday, more of an upper level trough begins to set up over the Gulf of Alaska which will start to direct the strong fall jet stream into central and southwestern B.C. The pattern for early next week will still be mild for the province, but at the same time the fall storm season will start to gradually ramp up a little more. 

In response to the trough developing, coastal regions of B.C. will see mild but wet conditions setting up through early next week.

Looking ahead into late next week, the pattern becomes less amplified and we get more of a zonal pattern. Meaning the upper level jet takes on more of a flat path across the country, as opposed to the meridional (high amplitude) pattern that is currently in place.

The more subdued upper air pattern will bring more seasonal temperatures to much of the west but across Alberta, the potential is there to remain just above the normal mark as persistent westerly flow remains in place. 

An important feature to watch is how the upper level low begins to push southeastward toward southwestern B.C.. This will direct an intensifying jet stream into the region which will act to bring in a more active storm track for southwestern B.C. which is what is expected for this time of year. 

We will be watching for a couple fall storms to potentially impact southwest B.C. late next week into the weekend.

WATCH BELOW: MYSTERIOUS 'BREATHING TREE' VIDEO EXPLAINED BY METEOROLOGIST


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