Author: Brad

Brad lives in Winnipeg with his wife and two children and is the founder of A Weather Moment. He has loved weather from a very young age and has followed that passion through his life so far. He received a B.Sc. in Earth Sciences with Specialization in Atmospheric Sciences and is currently employed in the field of meteorology. You can find the author as WeatherInThePeg on Mastodon.

Warming Up, Just to Get Knocked Back Down

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Temperatures will rebound early this week, but a big weather-maker may interrupt that warm-up by midweek.

Warmer air will move into Southern Manitoba on Monday, but it will be windy.

Monday

Monday

Sunny
21°C / 9°C

Today will be bright and sunny with temperatures improving over Sunday’s cool values. Highs will be in the low twenties over Southern Manitoba, which is quite a recovery from this morning’s lows, which were around freezing. The only downside to today’s weather will be a stiff southerly wind that will be 30 to 40km/h gusting to 50 to 60km/h by late afternoon.

Tuesday

Tuesday

Mainly Sunny
27°C / 13°C

Tuesday will be one of the warmest, if not the warmest, days this week with high temperatures in the mid to upper twenties. The humidity may even increase a bit by late in the day over some portions of Southern Manitoba. It certainly won’t be an oppressive mid-summer type of humidity, but may be noticeable nonetheless. Tuesday will be slightly less windy compared to Monday, but the wind will still be fairly strong and from the south.

Wednesday

Wednesday

Mix of Sun and Cloud. Rain late. Risk of a thunderstorm.
25°C / 17°C

What has been a fairly boring weather pattern so far this September may begin to take an interesting turn on Wednesday. A strong low pressure system is forecast to develop in the lee of the Rockies on Tuesday and move eastward into North Dakota by Wednesday. This system will prompt seasonably high moisture values to stream northward into the Dakotas and Southern Manitoba. This moisture will help to destabilize the atmosphere over a large part of the North-Central US, perhaps extending up into Southern Manitoba. This system will also pump warm air up into the region, with models currently suggesting temperatures will once again reach the mid to upper twenties in Southern Manitoba on Wednesday.

As this strong low pressure system interacts with that unstable environment, numerous thunderstorms may develop on Wednesday through Wednesday night. These storms may affect parts of Southern Manitoba at some point on Wednesday or early Thursday. Given the nature of this system it looks like the main severe threat will be heavy rain. However, it is too early to rule out the possibility of other forms of severe weather. We’ll have more updates on this system as the week progresses.

Long Range

The long range forecast will largely be determined by what happens with Wednesday’s system. At this point it appears likely that we’ll receive rain from this system, but the timing of that rain is too early to predict. Unfortunately, once this system moves out of our area it will deliver a parting shot of cold air, which will probably set up a chilly weekend. Again, how cold it will get is still not certain, but getting above seasonal values next weekend may be a struggle.

Warm Weather Gives Way to Cool Weekend

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Well above-seasonal temperatures will wash over Southern Manitoba today as a powerful low pressure system in the Arctic drags a swath of very warm air eastwards across the Prairies. It won’t be meant to last, though, as a strong ridge of high pressure builds in behind a cold front that pushes through on Saturday, bringing cool Arctic air with it for the weekend.

Friday

25°C / 15°C
Mainly sunny.
Saturday

22°C / 4°C
Cloudy with a good chance of showers or thundershowers, then clearing through the afternoon.
Sunday

19°C / 6°C
Mainly sunny and cool.

We’ll see a breezy wind out of the southwest today as temperatures climb into the mid–20’s thanks to a warm front that pushed through overnight. We might see a little bit of cloud, but for the most part skies should be mainly sunny. Still in the warm sector of this system, we’ll only drop to the mid-teens tonight with some increasing cloudiness towards Saturday morning as the cold front approaches.

Saturday morning will bring a fairly decent chance for some scattered shower activity as the cold front pushes into the Red River Valley from the north. There may be a few thundershowers as well but no significant or widespread thunderstorm activity is expected. Gusty northerly winds will move in behind the cold front – which should be through much of the Red River Valley by midday – with clouds scattering out to a mix or partly cloudy skies. The temperature should be able to climb a degree or two above the 20°C mark, however cold air advection will limit our high very close to that mark.

Skies will clear overnight as we drop down to a very chilly 4°C or so. Areas outside the city of Winnipeg may even see temperatures dip a little cooler than that. We may end up seeing the first frost of the year in some places on Saturday night but I don’t expect a widespread frost to occur.

Sunday will be a sunny but very cool day as the ridge of high pressure dominates the weather pattern over Southern Manitoba. We’ll see temperatures climb to only around 17 or 18°C by late afternoon but at least the winds should be relatively light, picking up out of the south later in the day to only around 15–20km/h. We’ll see an overnight low of around 7°C on Sunday night with clear skies.

Pleasant Second Half of the Week

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After some unsettled weather the past couple days, we’ll be seeing pleasant, slightly warmer-than-normal days through the second half of the week as a ridge of high pressure builds into the Prairies.

Wednesday

22°C / 8°C
A few clouds and breezy. Slight chance of isolated late-day showers.
Thursday

21°C / 7°C
Mainly sunny.
Friday

24°C / 12°C
Mainly sunny.

We’ll see a few clouds today with a breezy northerly wind as cooler air moves in behind yesterday’s cold front. We may see some isolated showers late in the day thanks to weak convergence along the western shores of Lake Winnipeg, however they would certainly not be widespread and they would have very limited duration. We’ll see a high of around 22°C tomorrow and we’ll drop down to a chilly 8°C overnight under clear skies.

Thursday will be the coolest day of the week with temperatures topping out only around 21°C and an overnight low dropping down to around 7°C. It may actually end up being one or two degrees colder than that at night depending exactly where the main axis of the surface ridge lines up, but suffice to say it will be quite cool on Thursday night. Winds will be light through the day and we’ll see mainly sunny skies and a clear night.

Outgoing Longwave Flux for 00Z Saturday Sept. 14, 2013 -- approximates cloud cover -- showing a potent low pressure system pushing through the Kivalliq region of Nunavut.

Outgoing Longwave Flux for 00Z Saturday Sept. 14, 2013 – approximates cloud cover – showing a potent low pressure system pushing through the Kivalliq region of Nunavut.

Friday looks to be a fairly nice day as an incredibly potent low pressure system moving through the Kivalliq region of Nunavut into Hudson Bay draws warm air from the Alberta Foothills eastwards across the Prairies. At this point it looks like Winnipeg will get into that warm air and see a high temperature around 25°C, although if the warmth ends up occluding slightly faster, the mid–20’s may be confined to Montana and North Dakota while we remain in the low 20’s. We’ll see a few clouds through the day, but for the most part it should be quite nice with winds out of the south or southwest at around 20km/h. Friday night will cool off to the low teens under clear skies.

A Look Ahead to the Weekend

The weekend looks pretty great at this point. A large ridge of high pressure will move in behind the powerful Arctic low bringing sunny skies, light winds and highs in the low 20’s. Saturday & Sunday nights will be quite chilly, though, with temperatures dipping down into the 4–5°C range, and perhaps even cooler outside the City of Winnipeg. We may end up seeing our first significant risk of frost this weekend depending on exactly how strong that ridge of high pressure ends up being.

An Oasis on the Horizon?

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After weeks of dry weather, some rain is finally on the way. However, for those desperately wanting rain, the water works may only come after the rain has ended.

A Low Pressure System will Spread Rain Over the Northern Plains on Monday

Monday

Monday

Mainly cloudy. Chance of showers.
23°C / 14°C

Today will see rain over some parts of Southern Manitoba as a powerful upper low approaches the region. This system will tap significant moisture over the Northern Plains, generating an area of moderate to heavy rainfall over the Dakotas. The core of this rain will slide mainly south through North Dakota and Minnesota, however the northern fringe of it may clip areas along the International Border up into south-eastern Manitoba. In these border regions rainfall amounts will be very hard to predict in advance, but a reasonable estimate would be for 5 to 15mm for the entire day. Actual amounts could be slightly higher or lower than this depending on the track of the system. In the rest of Southern Manitoba, little to no rain is expected. There will be a constant threat of showers today and tonight, but most areas including Winnipeg, should see very little if any rain. Other than the rain it will be a cloudy, but mild day, with light winds.

Tuesday and Wednesday

Tuesday

Mix of Sun and Cloud. Chance of Showers or Thundershowers.
27°C / 10°C
Wednesday

Mainly Sunny
21°C / 6°C

Tuesday should be a fairly nice day in Southern Manitoba. Skies will be a mixture of sun and cloud with temperatures in the mid to upper twenties. Late in the day a cold front will come through, likely triggering some showers and thunderstorms. These storms are not expected to be severe.

Not surprisingly, Wednesday will be a cooler day as colder air moves in behind that cold front. High temperatures will be in the low twenties with gusty north-westerly winds. Some fair weather cumulus clouds may develop during the day, but otherwise it will be mainly sunny.

Long Range

The long range outlook is a bit ambiguous at this point. It appears that we’ll probably see conditions begin to warm up around the weekend, only to be knocked back down by another cold front later on the weekend or into next week. This sort of up and down pattern makes forecasting fairly tough, so rather than making any sort of grand prediction I’ll just suggest that we’re in for a variable pattern with some warm weather interspersed with cooler periods.