Due to the September long weekend my deadline is a little earlier than usual, which means my confidence in this forecast will be fairly low. That said, I’ll do my best to generalize the expected weather over the upcoming seven-day period beginning Sept. 7. It doesn’t help that it looks like our weather pattern is beginning its switch to a fall-like pattern right on cue.
We had a pretty active end to the long weekend and first part of the week across southern and central Manitoba, and it looks like this active pattern will continue throughout the rest of this forecast period. The weather models show a broad trough of low pressure developing across central North America during the forecast period. This will likely result in our region seeing more clouds than sun, along with much cooler temperatures.
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The lowdown on winter storms on the Prairies
It takes more than just a trough of low pressure to develop an Alberta Clipper or Colorado Low, which are the biggest winter storms in Manitoba. It also takes humidity, temperature changes and a host of other variables coming into play.
High pressure will be over us on Wednesday, bringing sunny to partly cloudy skies along with seasonable temperatures. This high will quickly slide off to the east on Thursday, allowing an area of low pressure to begin making inroads from the west. This low will start off on the weak side, bringing clouds and a few showers to western regions late on Thursday and Friday. The weather models then show it strengthening as it passes through North Dakota on Friday and Saturday, which could bring some significant rains to extreme southern and eastern regions beginning late Friday and into Saturday. Expect seasonable temperatures ahead of this system on Thursday and Friday.
We’ll likely see clouds, showers and cool weather in the northerly flow behind this low on Sunday and Monday, with daytime highs only expected to be in the mid-teens and overnight lows in the 5 to 8 C range. Welcome to fall!
Usual temperature range for this period: Highs, 15 to 25 C; lows, 4 to 12 C.
