Westerly winds and high pressure dominate

When it comes to weather and weather forecasting you’ve got to love and hate this time of year. Both spring and fall are the transition periods between our two main seasons, winter and summer. In simple terms, it’s a time of battle between these two seasons. This can make for some interesting weather and can be a real headache when it comes to forecasting.

We saw this during the last forecast period, as Mother Nature decided to do her own thing, bringing in two different systems that were not forecast, though they did bring some much-needed precipitation. During this forecast period it looks like the weather pattern will be quieter, although there will be a few systems around that could impact our weather.

During the first part of this forecast period, the trough of low pressure that sat over Hudson Bay for the last week or so is expected to lift northeastward. At the same time, an upper low off California is forecast to move eastward across the central U.S. These shifts in the upper pattern will combine to allow our overall flow to become zonal or westerly. Weak high pressure will build in, bringing sunny to partly cloudy skies and high temperatures should be around the 10 C mark. These conditions should last right through the weekend. The upper California low will help develop a fairly strong area of low pressure as it passes by to the south, but all models keep this system well to our south.

For the second half of this forecast period, the weather models show a large area of low pressure developing off the coast of Alaska. This will slowly help to switch our winds to a slightly more southerly direction. As a result we’ll likely see temperatures inch up a little bit early next week, with highs expected to be in the 12 C to 14 C range. Skies will continue to be partly cloudy and overnight lows should remain above the freezing mark.

Usual temperature range for this period: Highs, 6 C to 18 C; lows, -4 C to 5 C. Probability of precipitation falling as snow: 20 per cent.

About the author

Co-operator contributor

Daniel Bezte

Daniel Bezte is a teacher by profession with a BA (Hon.) in geography, specializing in climatology, from the U of W. He operates a computerized weather station near Birds Hill Park.

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