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Here comes another upper low

Covering: June 18 – June 25, 2014

In summer, the one weather feature I don’t like to see is an upper low. They usually mean cloudy, cool, wet weather, which can last for days. So far this month we’ve seen two different upper lows move through and it looks like we might be in for another.

Last weekend we saw a fairly potent upper low, combined with a strong surface low, move across southern and especially eastern regions, bringing upward of 100 millimetres of rain to some areas. For this forecast period we’ll start off with some fairly nice early-summer weather on Wednesday, but the models predict another upper low to slowly amble across our region later in the week and over the weekend, bringing more clouds along with plenty of chances for showers and thundershowers. Luckily it looks like this low will be weaker than last weekend’s.

The low will slowly develop to our southwest on Wednesday. This will help draw up some nice warm air into our region, with highs expected to be in the mid-20s. Upper lows tend to have minds of their own and can be hard to predict exactly where they will go and how fast they will move. Currently, the models show the low staying to our south on Thursday, bringing us only a chance of some showers or thundershowers. The low is then forecast to slowly track across North Dakota on Friday and Saturday before moving out of our region on Sunday. I don’t think next weekend will be a wash, but there’ll be plenty of showers around, especially over extreme southern regions.

High pressure will start to build in on Sunday and should bring us dry weather to start next week. Along with the sunshine we should see nice warm temperatures with highs expected to be in the upper 20s to around 30 C.

Usual temperature range for this period: Highs, 20 to 29 C; lows, 6 to 15 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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