Colder Weather Continues with Chance of Light Snow

Winnipeg will continue to see cool temperatures through the weekend, but cloudier conditions will bring a chance of light snow to the city.

Clouds streaming southeastwards off Lake Manitoba will bring Winnipeg mixed to mostly cloudy skies to start the day. These bands of lake-effect cloud will also likely produce a bit of light snow, but other than a dusting that makes the roads a little wet. The snow should taper off midday as a ridge of high pressure moves into the region and the northwest winds begin to ease. A bit of sun is likely this afternoon, but temperatures will stay cool with a high near +2 °C.

Tonight, the region will see increasing cloud cover as a low pressure system moves into the Dakotas. This system will bring some light snow to areas along the international border, but Winnipeg should just see some cloud. Temperatures will dip to a low near -5 °C.

Saturday will start with cloudy conditions across the region with temperatures climbing to a high near +2 °C. As the low pushes eastwards out of the Dakotas, northwest winds will strengthen across the region into the 30–40 km/h range. This will result in bands of lake-effect snow redeveloping sometime later in the day into the evening. Winnipeg will likely see cloud and snow from Lake Manitoba by the evening hours and persisting through the night. Winnipeg shouldn’t see much more than a dusting of snow, but areas northwest of the city could see 1–4 cm by Sunday morning. Temperatures will dip to -5 °C on Saturday night with winds easing.

3km NAM Forecast Precipitation Type/Intensity valid 03Z Sunday October 18, 2020
Flurries from Lake Manitoba will move into Winnipeg by Saturday evening.

Winnipeg will continue to see bands of lake-effect cloud and intermittent light snow on Sunday. Temperatures will climb to a high near +2 °C with west-northwest winds in the 20–30 km/h range. Sunday night should bring partly cloudy skies to the region with temperatures heading to a low near -7 °C.

Long Range Outlook

Long-range forecasts continue to show cool weather for Winnipeg. Daytime highs may moderate into the mid-single digits next Tuesday and Wednesday, but then cooler air pushes back into the region with highs falling to the freezing mark by next Saturday. The region will likely see cloudier conditions next week with the occasional chance of light snow.

Today’s seasonal daytime high in Winnipeg is 10 °C while the seasonal overnight low is 0 °C.

Colder Conditions Arrive

Today marks the start of an extended period of seasonably cold conditions for Winnipeg.

A low pressure system skirting along the International border will bring cloudy conditions to the Red River Valley today. It will spread an area of rain across the region with up to 10 mm possible along the border. Amounts will quickly diminish northwards, though, with just a bit of light rain likely this morning in Winnipeg. Behind this low, a brisk northerly wind near 30 gusting 50 km/h will develop and usher in a much cooler air mass. Temperatures will only reach around 8 °C today, already several degrees below the seasonal average of 11 °C. The cloud cover will break up a bit tonight as the winds gradually ease. The city will see a low near -3 °C. Hard freezes will be common from here out.

From Thursday forwards, the region will be under a northwest flow aloft on the back side of a persistent vortex over Hudson Bay. This will result in a continued feed of cold Arctic air southwards into the region. Thursday and Friday will bring daytime highs successively colder at +4 and +2 °C respectively. Overnight lows should hover in the mid-minus single digits. Both Thursday and Friday will bring partly cloudy skies to the city and winds will gradually ease from around 30–40 km/h on Thursday to around 20 km/h on Friday. Other than the chance for some lake-effect rain showers or snow in the lee of the lakes — more likely Lake Winnipeg than Manitoba — conditions should stay dry.

Long Range Outlook

The long-range outlook shows nothing but a big vortex entrenched over Hudson Bay. As a result, it also shows nothing but seasonably cold weather for Manitoba. Forecasts show daytime highs locked at the low single digits and overnight lows hovering within a couple degrees of -5 °C.

NAEFS 8-14 Day Temperature Anomaly Forecast — Valid October 21-28, 2020
A stationary vortex over Hudson Bay will bring a prolonged period of cool temperatures to Manitoba. This NAEFS temperature outlook shows a high probability of seasonably cold weather over the province persisting into next week.

The cooler weather towards this coming weekend may end up producing lake-effect snow in the lee of Lake Manitoba in addition to Lake Winnipeg, particularly Friday night into Saturday.

Temperatures may begin to moderate towards seasonal values slightly next weekend (October 24–25), but confidence is low right now.

Today’s seasonal daytime high in Winnipeg is 11 °C while the seasonal overnight low is 0 °C.

Cooler Weather Ahead

Temperatures will slowly drop through the week in Winnipeg as a colder air mass gradually builds into the region.

Winnipeg will see just two more days of near-seasonal temperatures before a pattern shift ushers northerly winds and an Arctic air mass into the region. In the wake of yesterday’s rain, Winnipeg will see mainly sunny skies today. Winds will pick up out of the west to 30 gusting 50 km/h as temperatures climb to a high near 14 °C.

The winds will ease tonight as temperatures dip to around +3 °C. A passing disturbance will bring some cloud to the region overnight. A few showers are possible closer to the U.S. border, but Winnipeg should stay dry through the night.

On Tuesday, westerly winds will strengthen early in the day, up to as high as 40 gusting 60 km/h across the region. Temperatures will reach a near-seasonal high of 12 °C under sunny skies. The wind will quickly die off this evening followed by a low near +3 °C. Skies should gradually cloud over through the night ahead of the next low pressure system approaching the province.

RDPS 2m Temperature Forecast valid 21Z Wednesday October 14, 2020
Northerly winds will begin ushering cooler air into southern Manitoba on Wednesday.

On Wednesday, a low pressure system will dive across North Dakota into Minnesota. In Winnipeg, this system will bring cloudy skies with a chance of rain showers. Winds will also pick up out of the north to 30 gusting 50 km/h in the afternoon. These northerly winds will keep things cooler with a high of only 8 °C. The cloud cover will start to break up overnight as winds ease to northwesterly at 20 km/h and temperatures dip to a low of -3 °C.

Long Range Outlook

Colder weather continues to push southwards through the rest of the week under mixed to cloudy skies. Temperatures will top out near 5 °C on Thursday and drop towards 2–3 °C by the end of the weekend. Overnight lows will hover in the -2 to -5 °C range. A few rain showers (or snow flurries!) may be possible heading through the weekend.

Today’s seasonal daytime high in Winnipeg is 11 °C while the seasonal overnight low is +1 °C.

Cool Weather for the Weekend

A slow moving upper low over Manitoba will keep temperatures in Winnipeg cool with mixed to cloudy skies through the weekend.

Temperatures will stay seasonably cool right through the weekend for Winnipeg as a cold upper low slowly meanders across the province. Highs will hover around 20°C over the next few days with lows near 10°C. The city will also see a fair amount of cloud cover with mixed to cloudy skies.

Today will be the windiest day of the next few with southwest winds of 20 to 30 km/h in the afternoon. Saturday will bring light southerly winds, then they switch northerly for Sunday up to 30 km/h again.

GDPS 24hr. QPF valid 12Z Sunday June 21, 2020
A disturbance tracking through North Dakota will bring rain to southeastern Manitoba on Saturday.

Saturday will bring the only notable organized weather event over the next few days. A low pressure system moving through North Dakota will spread an area of rain across the southeastern Manitoba. The rain will develop midday and taper off through the evening and overnight periods. Regions under the main band of rain will see about 5 to 10 mm. Winnipeg will sit along the northwestern edge of the rain and could see a few hours of showers or, if it develops just a bit to the southeast, nothing but some clouds.

Some scattered showers are possible on Sunday, but will most likely occur over the Parkland and Interlake.

Long Range Outlook

Temperatures should return to seasonal values by the middle of next week with a bit more sunshine. For the second half of the week, Winnipeg should start seeing highs in the mid- to upper 20s again with comfortable humidity. No notable rain or severe weather threats appear in the forecasts through next week.

Today’s seasonal daytime high in Winnipeg is 24°C while the seasonal overnight low is 11°C.