Conditions Improve Through The Weekend

A return to summer conditions is on tap for Winnipeg as an upper-level ridge builds in behind a low pressure system that will move through on Saturday.

After a distinctly fall-like morning on Thursday where temperatures dipped as low as 3.1°C at the Winnipeg Airport, many will be relieved to hear that summer is on the way back to the region as the ridge of high pressure that brought the cold weather pushes off to the east and warmer conditions being working in from the west.

The first push of warmer weather will begin working into the region today as a slow-moving trough moves eastwards across Saskatchewan. Skies will remain fairly sunny today, but winds will pick up out of the southeast to around 30 km/h as the temperature climbs to a high near 26°C. Clouds will begin working into the region on Friday evening as the winds ease and temperatures drop towards a low near 15°C.

Temperatures will climb to slightly above-seasonal values across Southern Manitoba today.

Saturday will bring mainly cloudy conditions to Winnipeg as the broad trough of low pressure moves through the region. At the moment it looks unlikely that Winnipeg will see much in the way of precipitation, but if there is going to be any rain it would likely be in the afternoon or evening as the trough line swings through. The odds seem low, though, as the main areas of support for rain will pass by to the north and south, leaving Winnipeg & the Red River Valley in a bit of a gap. The cloudy skies will keep temperatures slightly cooler than Friday with highs near 23°C. Skies will clear out on Saturday night with temperatures dipping to a low near 14°C.

Winnipeg may dodge all of the rain moving through the region on Saturday as one feature passes to the south and another to the north.

Summer weather returns to Winnipeg for Sunday! There may be some low cloud or fog early in the morning, but that should burn off fairly quickly leaving the region with mainly sunny skies. Temperatures will be warm with highs reaching around the 28°C mark in the Red River Valley. Expect a low near 15°C on Sunday night.

Long Range

Next week will start off quite warm with highs in the upper 20’s and then trend towards more seasonal temperatures midweek. Things look to turn slightly more unsettled near the end of the week with rain and thunderstorms possible.

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

Another Cool, Showery Day Before A Slow Warm-Up

A shortwave rolling across southern Manitoba today will bring cloudy skies, cool temperatures, and a good chance of more rain showers through the afternoon. The remainder of the week will bring more sunshine and a slow return towards seasonal temperatures.

Extensive cloud moved into southern Manitoba overnight and will persist for much of today as an upper-level disturbance called a shortwave moves through the region. As it swings through, it will likely be supporting an area of showers that will move into the Red River Valley later this morning and move out mid- to late-afternoon. Rainfall amounts will generally fall in the 5-10 mm range throughout the main area of rain in the Red River Valley, however a narrow line of 10-20 mm accumulations may set up somewhere along the path of the shortwave as it moves through the valley.

RDPS 12hr. QPF valid 00Z Wednesday August 23, 2017
An area of showers will produce accumulating rain across a swath of Southern Manitoba today.

The cloud and rain will make for quite a cool day with high temperatures climbing to only the upper teens. Winds will be easterly wind at just 10-20 km/h. The rain and cloud will clear out this evening as a ridge of high pressure moves into southern Manitoba.

Thursday will be a relatively pleasant day when compared to Wednesday; expect mainly sunny skies, winds out of the southeast at 15-25 km/h, and a high near 23°C. Thursday night will continue clear with a low near 12°C.

Friday will bring seasonal temperatures back to the Red River Valley, but a developing low pressure system over the western Prairies will produce gusty southerly winds over the Red River Valley. The day will start off sunny, but become partly cloudy midday with winds increasing to 30-40 km/h out of the south. Highs will be near- to slightly above-seasonal in the mid-20’s.

GDPS 10m Wind Forecast valid 21Z Friday August 25, 2017
An area of breezy southeasterly winds will develop on Friday from Lake Manitoba southeastwards across the Red River Valley into Northern Minnesota.

More cloud cover will move in later in the day as a trough approaches from Saskatchewan. Expect a low in Winnipeg near 15°C on Friday night with winds gradually diminishing.

Long Range

Saturday will bring a cloudy day to the Red River Valley as a trough swings through the region. There will be a slight chance of showers or thundershowers as it moves through. There may be a few sunny breaks late in the day, but expect cloudy skies to return Saturday night with another slight chance of showers or thunderstorms.

Sunday will see things gradually improve with near-seasonal temperatures returning alongside some sunshine. The start to next week looks to bring near to slightly above-seasonal temperatures to Winnipeg with a fair amount of sunshine.

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

Weather Deals a Dud for Solar Eclipse?

Extensive cloud cover across the Red River Valley and southeastern Manitoba threatens to spoil the opportunity to see this year’s rare solar eclipse. On the flip side, if you’ve been waiting for some moisture, showers are likely across the Red River Valley today.

An upper-level disturbance tracking along the international border today will spread clouds and showers across Southern Manitoba early this morning and into the afternoon. Amounts will be rather low, with general amounts of 1-4 mm expected, although a bit of elevated instability associated with the system may end up producing some heavier showers or thundershowers that result in isolated patches of 5-10 mm of rain. Winds will be light out of the south to southwest until a cold front approaches in the afternoon, shifting the winds behind it to the northwest at 20-30 km/h. Temperatures will be cool due to all the cloud cover and/or showers with highs across the Red River Valley near 22°C.

Simulated image of the 2017 solar eclipse at peak coverage in Winnipeg, MB.
Simulated image of the 2017 solar eclipse at peak coverage in Winnipeg, MB.

Unfortunately, it will likely be mainly cloudy across all of the Red River Valley during the solar eclipse.1 The image above shows what it would look like for our region should we see sunshine; even at 75% obscuration, there would actually be only a marginal impact on overall brightness and it would not be nearly as dramatic as areas along 90%+ obscuration or the path of totality, where temperatures will actually drop a few degrees because the loss of sun is so substantial. Note: There is a small chance that the cloud cover may break up for a bit around the eclipse time; we’ll be keeping an eye on it and post updates on social media if that seems to be the case!

The cloud will begin moving out in the afternoon and if there manages to be enough sunshine, it could trigger an isolated thundershower or two along an approaching cold front. Temperatures will dip to a low near 12°C under partly cloudy skies on Monday night.

Temperatures will be below seasonal (blue) across southern Manitoba on Tuesday with a northwest flow.

Tuesday will also be a cool day across the region as a colder airmass moves in with a northwesterly flow. Winds will breezy at 30-40 km/h as temperatures once again climb to near the 22°C mark once again. Skies will be partly cloudy, and by the afternoon there will be a slight chance of a shower developing in the Interlake and drifting south/southeastwards along a weak trough that develops through the region. The chance for rain will likely be confined to Winnipeg & the northern Red River Valley. Temperatures will head to a low near 11°C as winds taper off and skies clear on Tuesday night.

Wednesday will see a return to more seasonal conditions. Winds will be light as a ridge of high pressure moves through the region and temperatures will reach a high near 24°C under partly cloudy skies. Expect mixed skies and a low near 12°C on Wednesday night with a slight chance of some showers as a frontal boundary slumps southwards.

Long Range

The latter half of the week looks quite summer-like with temperatures back into the upper 20’s and a fair amount of sunshine skies. There will be another chance of showers on Thursday night into Friday morning as that same boundary that moved through on Wednesday night reverses and starts heading back northwards.

The next large-scale organized chance for rain comes on Saturday as a large push of warm air moves into the region, producing showers and thunderstorms from northern Saskatchewan to South Dakota. It won’t be a solid line, and intensity will vary, so it’s going to be the kind of situation where it won’t be too clear until much closer to the event.

After Saturday’s system, it looks quite pleasant with near-seasonal temperatures and sunny skies.

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

  1. The solar eclipse begins at 11:40AM, peaks with 75% obscuration at 12:57PM CDT, and ends at 2:15PM. If by chance we see sun, under no circumstances should you look at the eclipse without eye protection. Blindness can occur in as little as 20-30 seconds.

Warm Weekend Arrives With A Slight Chance of Thunderstorms

The weekend will bring a fair amount of warmth to Winnipeg and the Red River Valley, but alongside it will come some chances for isolated to scattered showers or thunderstorms.

Today will begin with an upper-level disturbance sliding out of southwestern Manitoba into North Dakota. As it moves eastwards, it will spread some cloud into the Red River Valley along with along with a low chance of isolated to scattered showers or thunderstorms further south in the valley towards the Morden-Winkler-Altona area. The partly cloudy to mixed skies will clear out through the morning and early afternoon, leaving sunny skies as temperatures climb to a high near 28°C. Winds will be relatively light out of the west to northwest at 10-20 km/h. Expect clear skies tonight with calm winds as temperatures head to a low near 15°C, kept relatively mild by a warm front that moves through in the evening and overnight hours.

Saturday will be a scorcher over southern Manitoba as we move into the warm sector of a low pressure system tracking across the northern Prairies. Temperatures will climb towards a high near 32°C under mainly sunny skies with winds becoming fairly breezy out of the south at close to 30 km/h for the afternoon. Fortunately, humidity shouldn’t be too much of an issue. Late in the afternoon, a cold front will begin pushing across southwestern Manitoba into the Red River Valley, and that will bring with it a risk of thunderstorms. At this point, it looks like there will be a slight chance of strong to marginally severe thunderstorms moving from west to east through the Red River Valley from around 6-7PM until midnight. Temperatures will then head to a low near 15°C again with gusty northwesterly winds behind the cold front tapering off overnight.

Temperatures will climb into the low 30’s across Southern Manitoba on Saturday afternoon ahead of an approaching cold front.

Sunday will bring cooler temperatures to the region as breezy westerlies at 20-30 km/h develop and highs reach a near-seasonal 25°C or so. Skies will partly cloudy and there may be an isolated shower or two passing through, but no particularly intense rain is expected. Expect mixed to cloudy skies on Sunday night as temperatures dip to a low near 14°C.

Long Range

Next week will start with mixed skies and near-seasonal temperatures and continue that way through much of the week, albeit with a bit more sunshine working in as the week progresses. It looks fairly dry at this point with no significant threats for rain on the horizon until next weekend. It appears that temperatures will creep towards the upper 20’s once again as the week progresses. Overall, it looks like it’ll be another warm and dry week.

Winnipeg’s seasonal daytime high is currently 25°C while the seasonal overnight low is 11°C.