Updated: Sep 6, 2020
Well its fall, whether we like it or not... Colder temperatures are expected across the Prairie Provinces next week as a low pressure departs the area and a ridge of high pressure sets up shop across Alberta/Saskatchewan/Manitoba, bringing cold Arctic air southward.
Above is the predicted surface temperatures on Tuesday morning, which depicts a large area of -2C for parts of Alberta, Saskatchewan and Manitoba. On top of this, strong northerly winds will bring the first wind chills of the season. Some areas of the Interlakes Region of Manitoba may also see their first snowfall. Cold air surging south across the warm lakes will create precipitation "streamers", moving south-southeast of the lakes. Areas near of below freezing may see snowfall, but with no accumulation (warm ground).
Above is a loop of precipitation depiction where you can see the streamers coming off Lake Winnipeg and Lake Manitoba lasting well into Tuesday. Environment Canada has issued special weather statements earlier today to outline the risk of strong winds and frost (see below).
Environment Canada Statements
3:25 PM CDT Saturday 05 September 2020 Special weather statement in effect for areas in grey
Abrupt Transition to Fall this Labour Day Long Weekend
Timing: Sunday afternoon, September 6 to Tuesday, September 8 morning.
Wind Gusts: possibly up to 90 kilometres per hour from the northwest Sunday afternoon, with strongest gusts between the Saskatchewan border and Red River Valley.
Frost: Widespread frost is possible over a number of localities in southwestern Manitoba on Tuesday morning. A risk of frost may also linger over the Red River Valley and southeastern Manitoba Wednesday morning.
Remarks: After a day of above average temperatures on Saturday, an Alberta Clipper will pass across the Prairies on Sunday. The system will bring showers, gusty winds and cooler temperatures to southern Manitoba. A cold air mass will slide south in the wake of the Clipper and entrench itself over Manitoba by Tuesday morning. Frost advisories are expected to be issued with the Monday afternoon forecasts.