A Few More Showers Before the Sunshine

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Winnipeg will see a few more showers or thunderstorms today before sunnier conditions return to the region.

A low pressure system lifting through the province this morning will bring more unsettled weather to the Red River Valley. This system produced widespread thunderstorm activity over Montana and southern Saskatchewan yesterday that continued through the night and moved into southern Manitoba. The remnants of that nocturnal convection will move over the Red River Valley this morning, bringing a good chance of showers or thunderstorms to Winnipeg through the morning hours. Once this initial line passes, some sunny breaks should develop for the afternoon hours.

NAM Simulated Reflectivity Forecast valid 15Z Friday June 11, 2021
A band of showers and thunderstorms is forecast to move across the Red River Valley early Friday morning.

Winds will be breezy out of the southeast through the morning near 30 gusting 50 km/h. Once the line passes, they’ll shift southerly and strengthen to 40 gusting 60 km/h for the afternoon. Temperatures will reach a high around 21 °C today then head to a low near 14 °C tonight with clearing skies. Winds will stay out of the southwest overnight as they ease to around 30 km/h.

On Saturday, the upper-level pattern will change as a broad ridge begins building over western Canada. This will bring sunny skies to Winnipeg for the weekend with highs climbing into the upper 20s. Westerly winds will continue on Saturday at around 30 km/h, then ease on Saturday night. The winds will stay light on Sunday as a high pressure system moves into the province.

Long Range Outlook

The sunny and warm weather will continue through next week with highs in the mid- to upper-20s, lows in the mid- to upper-teens, and comfortable humidity levels.

Today’s seasonal daytime high in Winnipeg is 23 °C while the seasonal overnight low is 10 °C.

More Unsettled Weather for Winnipeg

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Winnipeg will see a couple more chances for showers or thunderstorms this week as unsettled conditions stretch to the weekend.

A low pressure system moving into the province overnight brought widespread showers and thunderstorms to the province. Any remaining activity that moved on overnight will drift off to the northeast this morning, leaving behind mixed to cloudy skies. Temperature will warm up quickly through the morning, reaching around 27 °C by midday. The warmth will be accompanied by humid conditions — dew points will climb into the upper teens — and provide a moderate amount of energy for the redevelopment of thunderstorms.

RDPS 2m Dew Point Forecast valid 21Z Wednesday June 9, 2021
Showers and thunderstorms will help produce humid conditions over southern Manitoba today.

A shortwave moving into the region will provide a trigger for storm development later today. As it crosses the Red River Valley midday, it will bring showers and thunderstorms with a low risk of isolated severe thunderstorms. The primary threat from these thunderstorms will be torrential downpours and marginally severe hail.

Skies will stay on the cloudier side tonight with a low near 14 °C.

Thursday will see a brief lull between disturbances. Temperatures will climb to a high near 24 °C under mainly cloudy skies. The city will see northerly winds through the day at around 20 km/h. Temperatures will dip to a low near 17 °C on Thursday night with a chance of showers or thunderstorms overnight.

RDPS 12-hr Accumulated Precipitation Forecast valid 00Z Saturday June 12, 2021
A broad area of rain and showers will move through the eastern Prairies on Friday with areas of relatively high rainfall totals.

A low pressure system will lift through the Prairies on Friday, bringing more rain to southern Manitoba. A broad area of showers will move through the region with a risk of thunderstorms. There will be little to no risk of severe weather with this system. The rain will keep temperatures a bit cooler with a high near 22 °C. The wind will shift from easterly near 20 km/h in the morning to south-southwest at 30–40 km/h in the afternoon. Skies will clear out late in the day with diminishing winds. Winnipeg will see a low near 14 °C on Friday night.

Long Range Outlook

A stretch of warm, dry weather will develop this weekend into next week. Winnipeg will see plenty of sunshine with highs of 25–30 °C and lows in the teens. Humidity levels look to stay comfortable right through the next week.

Today’s seasonal daytime high in Winnipeg is 23 °C while the seasonal overnight low is 10 °C.

Turning Unsettled As Warm, Humid Weather Arrives

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A warm and increasingly humid air mass will move into Winnipeg this week, bringing chances for showers or thunderstorms to the region.

An upper-level disturbance moving through southern Manitoba will bring cloudy periods to Winnipeg today. There will be a chance of showers, but most of the rain will pass to the north of Winnipeg. The best chance for any rain will be in the morning and midday hours. Temperatures will warm up in the afternoon with some sunshine poking through the clouds to a high near 26 °C. Skies will clear out tonight with a low near 15 °C.

Tuesday will start the move towards a warmer and more humid air mass. A sharp upper-level trough will dig over the western seaboard with an upper ridge over the eastern Prairies developing in response. Skies will stay mainly sunny as a warm front begins lifting towards Canada through the Northern Plains. Winnipeg will see light northeasterly flow ahead of the warm front through the day as temperatures head to a high near 30 °C.

RDPS 12-hr Accumulated Precipitation Forecast valid 12Z Wednesday June 9, 2021
Showers and thunderstorms will develop in the United States on Tuesday night and spread across southern Manitoba by Wednesday morning.

On Tuesday night, a low pressure system lifting out of Montana will support a strengthening flow overrunning the warm front. The combination of lift and destabilization will produce thunderstorms over the northern Plains that will push across southeastern Saskatchewan and southern Manitoba into Wednesday. There will be enough instability and organization in the environment for the risk of severe thunderstorms. The primary threats overnight would be hail and wind. There is also a chance that the thunderstorms may organize into a squall line. If they did so, it could bring damaging winds to portions of southeastern Saskatchewan and/or southern Manitoba overnight.

Temperatures will head to a low near 18 °C on Tuesday night.

RDPS 2m Dew Point Forecast valid 21Z Wednesday June 9, 2021
Humid conditions will spread across southern Manitoba on Wednesday.

On Wednesday, the warm front will lift northwards into southern Manitoba. This will combine with an upper level disturbance moving into the region to support scattered showers and/or thunderstorms. The cloud cover will keep temperatures cooler than Tuesday, but it will become substantially more humid. Although the high will be around 26 °C, dew points will climb into the 18–20 °C range and make it feel closer to the low 30s. The unsettled weather will push off to the northeast for Wednesday night with a low near 17 °C.

Long Range Outlook

The warm and humid weather will stick around for the rest of the work week with highs in the mid-20s and dew points hovering in the upper teens. The sun should return for Thursday afternoon, then another passing low will bring a chance showers and thunderstorms to the region on Friday. A cold front will sweep through after that, ushering in drier conditions for the weekend. Temperatures will stay warm into next week with highs in the 25–30 °C range.

Today’s seasonal daytime high in Winnipeg is 23 °C while the seasonal overnight low is 10 °C.

Hot, Unsettled Weather Ahead

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Winnipeg will see very hot and unsettled conditions heading through the weekend.

A low pressure system crossing the province today will send temperatures soaring in Winnipeg. South-southwest winds of 30–40 km/h will usher in a hot air mass with highs climbing into the mid- to upper-30s. The dew point will stay in the low teens which will mean, fortunately, that the humidity won’t make the heat feel any worse than it already is. A “cold” front will sweep southwards through the Red River Valley later today. This front will bring a risk of thunderstorms to the region as it passes, although the most likely area to see any convection will be south near the U.S. border. Winds will shift to the north behind the front and then ease overnight. Temperatures will head to a low near 18 °C.

RDPS 2m Temperature Forecast valid 18Z Friday June 4, 2021
Temperatures will climb into the mid-30s by lunch time today across portions of southern Manitoba.

On Saturday, moderate southerly winds will bring more hot weather back into the region as another low pressure system moves into the province. Temperatures will climb back into the mid-30s but this time humidity will accompany it. Dew points will climb into the mid- to upper teens, making it feel closer to +40 out. That heat and humidity will meet another cold front pushing into the Red River Valley late in the day. This combination will bring a risk of thunderstorms — potentially severe — to the region Saturday evening and overnight. Temperatures will head to a low near 19 °C.

3km NAM Simulated Reflectivity Forecast valid 07Z Sunday June 6, 2021
Many weather models show the potential for nocturnal thunderstorm development on Saturday night into Sunday morning.

Drier, slightly cooler air will work into the region on Sunday. The morning will start with some lingering cloud with a chance of showers or thunderstorms as the cold front slowly continues to push through the valley. It should be off to the east by late in the morning with skies clearing for the afternoon. Temperatures will climb to a high near 27 °C with a moderate westerly wind bringing more comfortable humidity levels to the region. Skies will stay clear on Sunday night with a low near 14 °C.

Long Range Outlook

Next week will start with mainly sunny skies and highs near 30 °C again. Forecasts show more unsettled conditions developing mid-week, then gradual cooling back towards seasonal values by the weekend.

Today’s seasonal daytime high in Winnipeg is 22 °C while the seasonal overnight low is 9 °C.