Issued: Monday, November 16, 2009 Covering: November 18 –November 25

High pressure will once again be the dominant weather feature, at least for the first half of this forecast period. A ridge of high pressure over the central part of North America will provide for plenty of sunshine this week, along with temperatures at or past the top end of the usual temperature range for this time of the year.

By the weekend, it looks like this ridge will start to break down, as a trough of low pressure begins pushing in from the West. This area of low pressure will bring clouds and a chance of showers or flurries early in the weekend. The weather models are not confident on how this trough of low pressure will evolve, but this is a small chance that the southern end will intensify and then push northeast. This would give southeastern areas a chance of seeing some measurable snow late in the weekend.

Weak high pressure will build back in for the first part of next week, bringing with it a return to at least partly sunny skies. Temperatures will be cooler, with highs likely staying below the freezing mark. If we do not have any significant snow cover, temperatures for the most part should remain fairly mild next week.

For those of you hoping for snow, the long-range models show the weather pattern becoming more active near the end of the month, so we still might see snow and winter arrive before December.

Usual temperature range for this period: Highs: -11 to 2C. Lows: -22 to -6C.

Probability of precipitation falling as snow: 95 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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