Summer Scorcher Leads to Unsettled Weather

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The summer heat will gradually wane over the coming days as unsettled conditions move into the region.

A large upper ridge over the Prairies will bring another day of scorching weather to southern Manitoba. With blazing sunshine, Winnipeg will see temperatures soar to a high near 34 °C. Dew point temperatures will stay in the mid- to upper teens, producing humidex values near 40 through the afternoon.

Tonight, a low pressure system will slide across the province, dragging a cold front with it to the east. That will bring some cloudiness to the city overnight as temperatures dip to a low near 16 °C. Heading through the second half of the night, Winnipeg will see a low chance of showers or thunderstorms as the low moves into the Red River Valley.

NAM 2m Temperature Forecast valid 21Z August 19, 2020
Scorching hot summer temperatures will be in place across the southern Prairies today.

On Thursday, any chance of rain will come to an end in the morning as the low moves off to the east. Temperatures will quickly rise to a high near 32 °C with partly cloudy skies for the rest of the day. The winds will shift to the north for the afternoon behind a weak cold front that moves through the area. Temperatures will dip to a low near 16 °C on Thursday night with a few clouds.

On Friday, a shortwave moving eastwards will run along a warm front draped across southern Manitoba. Skies will be mixed to cloudy with a good chance of some showers or thunderstorms through the day. Winnipeg should see a high near 26 °C, but it will be sensitive to the exact placement of the warm front and how much sun manages to poke out. If it ends up a tad on the sunnier side, temperatures could climb as high as 30 °C. Some marginally severe thunderstorms may be possible and there is the potential for some training storms resulting in locally high rainfall accumulations in bands parallel to the warm front.

The unsettled conditions will clear out on Friday evening with temperatures dipping to a low near 17 °C.

Long Range Outlook

The weekend will bring more settled conditions back to the region with seasonably warm highs in the upper 20s. On Sunday, a weak disturbance passing through may bring the chance for thundershowers back to the region.

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

Sunny and Hot Weather Ahead

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An upper ridge building across the Prairies will bring sunshine and warm summer temperatures to Winnipeg this week.

The next several days will bring plenty of sun to Winnipeg with highs climbing from the mid-20s into the low 30s. Winds will be light through the first half of the week, maxing out at 15 to 25 km/h out of the south.

A warm front will push eastwards through the region Tuesday morning, bringing a few clouds and a slight chance of a shower or isolated thunderstorm. It should clear out quickly, leaving sunny skies across the region. Another chance for rain will develop on Wednesday evening as a low pressure system moves into the region. Some cloud cover will develop on Wednesday afternoon, followed by a chance of showers or thunderstorms on Wednesday night into early Thursday.

RDPS 2m Temperature Forecast valid 21Z Tuesday August 18, 2020
Hot weather will move back into southern Manitoba on Tuesday.

Fortunately, the humidity should stay fairly comfortable with dew points generally in the 16 to 18 °C range.

Long Range Outlook

More showers or thunderstorms will be possible on Thursday as the low pressure system continues moving through. Behind it, northerly winds will usher seasonal temperatures back in for the weekend.

Today’s seasonal daytime high in Winnipeg is 25°C while the seasonal overnight low is 12°C.

Cooler With Showers Likely

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Winnipeg will see cooler conditions as unsettled weather continues over the next couple days.

Cool and cloudy conditions will continue in Winnipeg today. A low pressure system lifting northeastwards out of the Dakotas will spread cloud and showers across the Red River Valley through the day. Many areas in the Red River Valley will likely see showers through the day today with accumulations of 10 to 20 mm. Areas of more intense convection with isolated thunderstorms may develop with this system as well, producing localized rainfall accumulations in excess of 30 mm.

The cloudy, wet conditions will keep temperatures cool with a high near 20°C. It will also be a windy afternoon with northwest winds strengthening to 30–40 km/h. Winds will taper off this evening with temperatures dipping to a low near 11°C.

NAM Simulated RADAR Reflectivity valid 00Z Saturday August 8, 2020
A low pressure system lifting northeastwards will spread showers through southern Manitoba today.

Saturday will bring mixed skies to the region with west-northwest winds of 20–30 km/h. An upper trough moving through the region will bring a chance of showers to the area again through the afternoon, but the increased sunshine will help temperatures climb to a seasonal 25°C. Skies will clear out in the evening with easing winds as temperatures head to around 12°C.

Settled conditions will push into the Red River Valley for Sunday as an upper ridge builds across the Prairies. Winnipeg will see a few clouds through the day and temperatures will reach a seasonably cool high near 22°C. Winds will be breezy out of the northwest up to 30 gusting 50 km/h through the day. As a high pressure system moves into the region on Sunday night, any remaining cloud will clear out, the winds will ease, and temperatures will head to a low near 11°C once again.

Long Range Outlook

Next week is looking great for Winnipeg with more pleasant summer conditions. The city should see plenty of sunshine through the week with near-seasonal temperatures. There may be some chances for thunderstorms with disturbances rippling southeastwards down the upper ridge, but much of that activity would likely be focused more during the nighttime hours.

Today’s seasonal daytime high in Winnipeg is 25°C while the seasonal overnight low is 12°C.

Summer Heat Building Back In

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Temperatures in Winnipeg will begin to climb back towards the 30s over the coming days.

A weakening trough of low pressure will move through Winnipeg today, bringing mild temperatures and light south winds. With partly cloudy skies, the city should see a high near 27 °C. Skies will clear for the night with a low near 16 °C.

On Thursday, a ridge of high pressure will lie draped across southern Manitoba and southeastern Saskatchewan. This will bring mainly sunny skies to Winnipeg with light southerly winds. Temperatures will be a bit warmer with a high near 29 °C, but humidity levels should still be comfortable. Thursday night should see a low near 17 °C.

GDPS 2m Temperature Forecast valid Saturday August 8, 2020
Hot summer weather will return to the Red River Valley on Friday.

Friday will be when the hot and humid weather settles back into the region. Winnipeg will see temperatures climb to a high near 32 °C and a breezy southerly wind will draw humid conditions northwards. By the end of the day, the dewpoint is forecast to reach almost 20 °C which would make for noticeably muggy conditions.

A cold front will push eastwards across the region on Friday evening into the night. It looks likely that it will support an area of showers and thunderstorms as it moves through.

Long Range Outlook

The weekend will bring more sunshine with a return to comfortable humidity levels. Both Saturday and Sunday will see high temperatures in the upper 20s.

Today’s seasonal daytime high in Winnipeg is 26°C while the seasonal overnight low is 13°C.