Unsettled Weekend Ahead

Unsettled weather will continue through the weekend as multiple disturbances ripple across Southern Manitoba, bringing mixed skies alongside a few chances for rain.

Yet another round of nocturnal convection1 will roll through this morning just ahead of a weak cold front slowly pushing eastwards across the Red River Valley. As of writing this2 there is still some uncertainty as to how extensive the convection will become, but best indications are that we could see a few showers or thundershowers early this morning as a more intense area of convection passes to the south. After that, Winnipeg & the Red River Valley should see clearing skies through the morning, especially once the "cold" front moves through.

Behind the cold front, westerly winds will ease the humidity that has built into the region over the past two days as dew points drop from the upper teens back towards the 10°C mark. With drier weather and sunny skies, temperatures should climb to a high near 27 or 28°C throughout the Red River Valley with winds up to 20-30km/h out of the west-northwest. Expect partly cloudy skies overnight with a low near 15°C.

Saturday will bring more cloud to the region as mixed skies develop through the morning with a chance of some light shower activity through the Red River Valley. Things should clear out by the evening, and the late day sun should push us to a high near 26°C.

While models keep the bulk of precipitation to our south on Saturday, a few light showers are possible thorugh the Red River Valley.
While models keep the bulk of precipitation to our south on Saturday, a few light showers are possible thorugh the Red River Valley.

Winds will shift back around to the south late in the day, beginning to bring more humid air back into the region; with dew points expected to rise back into the mid-teens overnight, overnight lows will be kept fairly warm at around 17°C. We'll see a few clouds overnight.

Sunday will see yet another disturbance move through the region bringing another chance of showers or thunderstorms. The main threat for precipitation will occur through the morning hours, followed by skies becoming mixed in the afternoon. Daytime highs should be around 26 or 27°C with muggy conditions in place much of the day as dew point values hover around 17°C. As skies clear, gusty winds will pick up out of the west to around 30 km/h.

This simulated RADAR image from the NAM shows a large area of convective rainfall moving through the Red River Valley on Sunday.
This simulated RADAR image from the NAM shows a large area of convective rainfall moving through the Red River Valley on Sunday.

Drier air will push in Sunday evening, helping overnight lows dip to a cooler 13°C or so with just a few clouds.

Long Range

Unfortunately, things don't look much better to start off next week. Another round of showers are possible late Monday through the overnight period as a disturbance slumps through from the northwest. Afterwards, though, it looks like we might see a few dry days with daytime highs ranging from the low 20's to the upper 20's.

  1. Nocturnal convection is the term applied to thunderstorms that persist through the overnight period. They are different from typical thunderstorms in that they get their heat and moisture from features detached from the ground.
  2. Currently around 10PM on Thursday evening.

Mixed Conditions Through Remainder of Week

Conditions will be mixed across Winnipeg & the Red River Valley through the remainder of the week with today's wet weather & seasonal temperatures giving way to warmer conditions with unsettled conditions building back in for the end of the week.

Today will start off with showers across the southern Red River Valley; there's a chance that we'll see some of the activity here in Winnipeg, but so far this system has been very difficult to get a handle on. Winnipeg may see the precipitation edge into the city this morning, but there's about an equal chance that it will stall just to the east of the city and never make it in.

Radarscope – Woodlands 0.3° Reflectivity
An area of rain is pushing towards Winnipeg this morning.

By this afternoon, the rain should head back off towards Ontario and Winnipeg will be left with cloudy skies that will clear through the afternoon. Temperatures will climb towards a high of 23°C in Winnipeg today, with highs of 22-25°C across the Red River Valley. Expect a low near 15°C tonight under mainly clear skies.

Thursday will be a very nice day through the Red River Valley with a few clouds and much warmer weather. Daytime highs will climb around 28°C while a breezy south-to-southeasterly tap into higher moisture to the south, pushing dew points into the upper teens. This will make things feel slightly muggy, and that high of 28 feel closer to something in the mid-30's. A frontal wave passing through in the late afternoon will bring a risk of thunderstorms to Winnipeg & the Red River Valley through the evening hours. Temperatures will fall towards a low of 18°C under mixed skies overnight.

This simulated RADAR image shows precipitation moving through the Red River Valley on Friday night.
This simulated RADAR image shows precipitation moving through the Red River Valley on Friday night.

Friday will bring mixed skies to Winnipeg with drier air moving in behind the passage of a cool front in the morning. Temperatures will still climb to a high near 28°C once again, but by late afternoon significantly more cloud will begin moving into the region as the cool front rebounds and begins pushing back through the region. In the evening, showers and thunderstorms will be possible across the Red River Valley as the warm front slowly pushes northwards. Temperatures will fall to a low near 18°C once again on Friday night.

Long Range

The weekend is looking like it could be a wet one once again. Currently a low pressure system is forecast to move through the region on Saturday, which would likely bring a rainy day to the region with 15-25mm of rain possible. Things will improve a bit on Sunday as the system leaves the region, but a slight chance of showers may linger through the day.

Daytime highs will be in the low- to mid-20's and overnight lows will dip down to the mid-teens.

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

Beautiful Start to the Week, but More Rain is Coming

This week will get off to a great start, with warm temperatures and sunny skies. However, more rain is on the way Tuesday night as the next low pressure system moves into the region.

Warm weather is expected in southern Manitoba today
Warm weather is expected in southern Manitoba today

The Week

Today will be a great day in southern Manitoba. High temperatures in the mid to upper twenties are expected with sunny skies. Winds will be light from the west. Today may end up being one of the nicer days this week, so enjoy it!

Tuesday will see temperatures in the mid twenties, but with increasing cloudiness through the day as a low pressure system begins moving into the region. Winds will be breezy out of the south-east at 20 km/h gusting to 40 km/h ahead of this system. Rain is expected to move into southern Manitoba on Tuesday night with this next system.

Wednesday will see rain ending from the aforementioned low pressure system. At this potential rainfall accumulations remain uncertain, so check back tomorrow for more details. Once the rain ends skies will remain mainly cloudy with temperatures in the upper teens. Winds will be from the north at 20-30 km/h.

Long Range

The long range forecast shows warmer weather returning late this week. Models are also hinting at our next risk of thunderstorms developing on Thursday and/or Friday with the approach of an upper trough moving in from western North America. We’ll have more details about this risk later in the week. Besides the thunderstorm risk, long range models generally show above seasonal temperatures for the remainder of June, although some cooler stretches are likely to be interspersed with the warmer ones.

Unsettled Weather Reappears This Weekend

Unfortunately for the water-logged fields of the southern Red River Valley and the many ruined plans of office workers just looking for a couple nice days to spend outside, more unsettled weather will be moving through the Red River Valley this weekend with another round of showers or thunderstorms rolling in on Saturday night into Sunday.

Today will start off with the remaining convection from overnight pushing off to the east of the Red River Valley, with the sun then coming out in the morning and quickly pushing our temperatures up into the high-20’s. Winnipeg will likely be within a few degrees of the daytime high of 29°C by lunch. The rain overnight helped bump up our dewpoints, so until drier air begins moving in from the west this afternoon it will feel quite humid outside with temperatures of 26-29°C feeling more like 33-36°C. Temperatures will cool off tonight thanks to the lower dewpoint values moving in to a low temperature near 12°C.

Saturday will bring mixed skies and cooler temperatures as north to northeasterly winds shunt off the warmer air in place today. There isn’t too much to mention at this point for Saturday, so enjoy it! Temperatures will dip to around 13°C on Saturday night with increasing cloud.

NAM Simulated Reflectivity valid 15Z Sunday June 12, 2016
The NAM shows an area of rain tracking across the Red River Valley on Sunday morning.

Sunday will likely bring another bought of convective rainfall to the region. A shortwave riding over the Northern Plains will lift northeastwards into southern Manitoba on Sunday, spreading an area of rain ahead of it. There will be a risk of a thunderstorm associated with it, but at that point the risk looks small. Current indications are that the rain will start in the morning, be fairly intense, and end by midday with a widespread 10-15mm, however speed and timing may change between now and then. Temperatures will be cool with a high in the mid-teens and a low near 10°C. Winds will be moderate out of the southeast at 30-40km/h.

Heading into next week, it looks like things will finally settle a bit and we may get a stretch of warm, dry weather with daytime highs in the upper 20’s, overnight lows in the mid-teens or warmer, and little expected by way of widespread precipitation or significant storm threats.

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