The old weather pattern returns

Issued: Monday, June 29, 2015 – Covering: July 2 – July 8, 2015

Our overall weather pattern seems to have slipped back into the same general pattern that prevailed for much of the winter and spring. That pattern had a persistent ridge of high pressure over western North America and a trough of low pressure over eastern regions. We were stuck between these two main features and our weather depended on which was the stronger of the two.

It looks like the first half of this forecast period will see the western ridge gain strength and build eastward a little, which means a fair bit of sunshine along with warm/hot temperatures. A weak system will move through late Wednesday, bringing with it the chance of some scattered thundershowers. High pressure will then build in on Thursday and Friday, bringing plenty of sunshine with highs expected to be in the upper 20s. A strong area of low pressure is then expected to round the top of this ridge of high pressure over the weekend, bringing the next chance for some unsettled weather.

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It currently looks like this low will track well to our north over the weekend, then pass into northern Ontario by Monday or Tuesday. Southerly winds ahead of the low will help to really boost the temperatures, with some readings in the low 30s C possible on Saturday or Sunday, depending on how fast the system moves. We should see a fairly good chance of showers and thundershowers sometime over the weekend as this low moves by, dragging a cold front through the region. This front will bring in cooler air to begin next week, with the high on Monday expected to be around 20 C.

Temperatures during the first half of next week will slowly moderate under the strong summer sunshine as high pressure builds into our region. Expect plenty of sunshine with only a few afternoon clouds and daytime highs warming back into the mid-20s by Wednesday or Thursday.

Usual temperature range for this period: Highs, 21 to 31 C; lows, 9 to 18 C.

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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