A storm system tracking through Manitoba today will bring one last shot of warmer weather alongside some rain before a major pattern shift plunges much of central and eastern North America into a substantial outbreak of Arctic air.
Friday: Windy and Rainy Afternoon
Today will start off with overnight rain tapering off fairly early in the morning; the temperature will start off around 2°C and climb to a high of 7 or 8°C under mostly cloudy skies. There’s a slight chance of a few sunny breaks in the morning to midday, but it won’t take too long until the cold front comes sweeping through the Red River Valley.
Winds will strengthen dramatically out of the northwest through the afternoon from nearly calm winds at lunch time to around 40-50km/h with gusts as high as 70km/h. Along with the strong winds, a band of showers will move through with just a few mm expected. Temperatures will drop behind the cold front heading to a low of around -5°C tonight.
Lake-effect snow may rear its head as well tonight as the northwesterlies bring the significantly cooler air over the still-open lakes. Areas in the lee of the lakes may see lake-effect snow develop sometime late in the evening through the overnight period. It looks like Winnipeg will miss out on the lake-effect activity, but we’ll keep an eye on things as they develop this evening.
Significantly Cooler Weekend
The weekend ahead will be marked by the beginning of a move into a much cooler air mass. Saturday will be a breezy, cool day with northwesterly winds 20-30km/h and a high near -2°C. Winnipeg will sit near the northern edge of a large bank of cloud stretching through Saskatchewan into North Dakota & Minnesota, which should result in mainly cloudy skies. A few sunny breaks are likely, however if things shift a bit further south the day could end up being a whole lot sunnier.
Under any of the cloud stretching through the Red River Valley, some very light flurry activity is possible. No accumulations are expected.
Temperatures will drop to around -6°C under clearing skies on Saturday night.
Sunday will bring mainly sunny skies and lighter winds as a ridge of high pressure sets up over the region. We had mentioned the chance for snow on Sunday in our last post, but as suspected all models are now pushing it well to our south. Expect a daytime high near -2°C and an overnight low near -9°C.
Even Colder Weather Next Week
Unfortunately, even colder weather is expected to move into the region next week, driving temperatures well below the seasonal high of around 0°C.
A prominent upper-level trough will dig over the eastern United States next week, developing a pipeline of Arctic air straight from the North Pole into the central United States. Expect highs in the mid-minus single digits and lows near -10°C or so. No major systems are forecast to track through, and it appears that most snow that may show up will either be lake-effect or general light flurry activity. The lack of snow cover should help our temperatures from dropping too far, particularly at night.