Category: Forecasts

Here Comes The Deep Freeze

Brad Leave a comment

Now that the cleanup is underway after a brutal snowstorm that dumped over a foot of snow across many places in Southern Manitoba and produced white-out conditions that closed a majority of major highways across the region, cold Arctic air will spread southeastwards across the Prairies, bringing below-seasonal temperatures for the first time since mid-October.

Today will be a shockingly cold day with daytime highs of just -17°C as a ridge of Arctic high pressure builds into the region. Skies will be partly cloudy with light winds out of the west to northwest. There will be a slight chance of flurries as light lake-effect snow continues off of Lake Manitoba. Tonight will be very cold with mostly clear skies and a low near -26°C.

This impressively strong Arctic outbreak will send sub-freezing temperatures (blue) all the way to the Gulf of Mexico states.

This weekend will be cold. Saturday will see a high of just -18°C and a low near -25°C. There will be some cloud cover that works its way into the region in the afternoon as a disturbance slides through South Dakota, but other than a chance for some flurries near the US border, shouldn’t cause much weather for us.

Sunday will be a bit of a mixed bag with a few clouds likely in the morning, then some clearing, then increasing cloud as the next system that will affect us approaches. Temperatures will be a bit milder with highs near -16°C, but with winds picking up out of the south to 20-30 km/h, it will feel closer to -25. Sunday night will bring cloudy skies with an increasing chance of snow as temperatures drop just a couple degrees to a low near -18°C.

Long Range

Sunday night’s disturbance will bring a chance for flurries to Southern Manitoba alongside a shot of slightly-below seasonal temperatures, but on the back-side of it another shot of Arctic air will blast southeastwards and plunge temperatures back into the -20’s. Will we see our first -30°C low next week? Time will tell.

Winnipeg’s seasonal daytime high is currently -9°C while the seasonal overnight low is -18°C.

Flurries Mark Descent Into an Arctic Chill

Brad Leave a comment

A powerful winter storm brought 20-30cm of snow to much of the Red River Valley yesterday followed by another 4-8cm overnight. This fresh snow combined with powerful northerly winds to produce white-out conditions on area highways. The snowfall accumulations combined with the blowing snow resulted in the closure of many area highways making travel nearly impossible. While conditions will gradually improve, it will be at the cost of the warmth that’s been in place over the region for the past month: the coldest temperatures we’ve seen since February are on the way.

This map from 8:20PM yesterday shows the extensive road closures (red) across Southern Manitoba.
This map from 8:20PM yesterday shows the extensive road closures (red) across Southern Manitoba.
Wednesday
-4°C / -10°C
Flurries with blowing snow

Today will bring flurries to the region as a weak disturbance slides through from the northwest on the backside of the main low pressure system that brought the heavy dump of snow yesterday. The gusty northerly winds will continue with winds out of the north to northwest at 40 gusting 60 km/h. While the snow won’t be nearly as heavy as yesterday, most places can still expect another 2-4 cm of snow.

The one exception to that will be areas in the lee of Lake Manitoba, where a band of lake-effect snow is expected to develop which will move south-southeast off the lake. This will result in a narrow band of snow which could see accumulations potentially reach as high as another 15-20cm, depending on how intense the flurries become.

The 4km NAM model shows a narrow band of enhanced snowfall today in the lee of Lake Manitoba, passing just west and south of Winnipeg.
The 4km NAM model shows a narrow band of enhanced snowfall today in the lee of Lake Manitoba, passing just west and south of Winnipeg.

Snow will taper off this evening, save for lingering snow moving off the lakes. Skies will remain mainly cloudy as temperatures head towards a low near -10°C with winds easing to 30 gusting 50 km/h by Thursday morning.

Thursday
↓ -14°C / -21°C
Cloudy with a chance of flurries

Thursday will continue with mainly cloudy skies and a chance of flurries, but winds will slowly ease to around 20 km/h. Temperatures will remain steady through the morning, but then drop towards the -14°C mark through the afternoon. Skies will begin to clear through the evening, save for a narrow band of cloud coming off each of Lake Manitoba and Lake Winnipeg. There’s a fairly decent chance that Winnipeg will see some flurries from Lake Manitoba on Thursday night as winds shift to more of a WNW direction. Temperatures will drop to a low near -21°C, but may remain a few degrees warmer underneath the lake-effect cloud cover. Wind chill values will be in the -30 to -35 range overnight.

Friday
-17°C / -24°C
Partly cloudy

Much of the cloud cover will break up on Friday with winds dropping off as the Arctic ridge begins moving into the province. While there will be some sun, temperatures will be well below seasonal values with highs near the -17°C mark. Temperatures will dip to a low near -24°C on Friday night.

Long Range

The cold weather will last through the weekend and into the start of next week; Saturday and Sunday will likely see highs in the -15 to -20°C range with the chance of flurries as a disturbance moves through. Even colder air has the potential of building in for the start of next week, potentially pushing daytime highs below -20°C.

NAEFS 8-14 Day Temperature Anomaly Forecast — Valid December 14 to 21, 2016
NAEFS 8-14 Day Temperature Anomaly Forecast — Valid December 14 to 21, 2016
In general for the first half of December, below-normal temperatures are expected as an air mass that had previously been locked over Siberia has shifted across the Arctic and will remain entrenched over the northern sections of North America.

Winnipeg’s seasonal daytime high is currently -8°C while the seasonal overnight low is -18°C.

Major Winter Storm Moving In

Scott 1 Comment
Environment Canada has issued a Winter Storm Warning for this system.

A major winter storm is moving in as you read this article. It will bring the first serious snowfall of the year to the Red River Valley, with heavy blowing snow or even blizzard conditions possible in many areas. You may want to reconsider any travel plans early this week!

A strong low pressure system will bring heavy snow and strong winds to southern Manitoba early this week
A strong low pressure system will bring heavy snow and strong winds to southern Manitoba early this week

Today

Monday
0°C / -2°C
Snow beginning

A strong low pressure system will move off the Rocky Mountains and into North Dakota today. It will spread moderate to heavy snowfall into parts of western Manitoba this morning, before snow spreads over the rest of southern Manitoba later in the day. Snowfall will fall for the entire day in most of western Manitoba, with total accumulations of 10-15 cm expected in most areas. Further east, the Red River Valley will see lesser amounts today, with 2-5 cm in the Winnipeg area and more like 5-10 cm near the International border. Local amounts of 15 cm may occur along the International border in south-central Manitoba. Winds will be gusty from the east at 20-30 km/h, producing some blowing and drifting snow.

Tuesday

Tuesday
-2°C / -4°C
Blizzard Developing with Heavy Snow

Conditions will really begin to deteriorate early Tuesday as winds shift to the northwest. Snow will continue to fall as well, with an additional 10-20 cm possible in the Red River Valley on Tuesday. Snow will taper off in southwestern Manitoba, but another 2-5 cm will be possible. The northwesterly winds that develop will be strong at 40 km/h gusting to 60 km/h, with higher values of 50 km/h gusting to 70 km/h in some treeless areas. This will likely result in blizzard conditions over large parts of southern Manitoba, especially south and west of Winnipeg. Those areas that don’t quite meet blizzard criteria will certainly see heavy blowing and drifting snow, with travel becoming difficult or impossible in some areas. Road closures are likely, especially the Trans-Canada Highway west of Winnipeg and Highway 75 south of Winnipeg. Conditions will not improve significantly until early Wednesday.

Expect storm-total snowfall accumulations by Wednesday morning.
Expect storm-total snowfall accumulations by Wednesday morning.

Wednesday

Wednesday
-12°C / -20°C
Snow and blizzard ending

Snow should finally taper off on Wednesday morning in all of southern Manitoba, but not until most areas have received significant accumulations of snow. Southwestern Manitoba can expect 15-25 cm, while Winnipeg can expect 10-20 cm. Areas along the International border in south-central Manitoba can expect to receive 20-30 cm. Locally higher amounts may occur where heavier bands of snow persist for a longer period of time. Large snow drifts will be a problem on Wednesday, even once the snow ends. Some rural roads may be impassable due to heavy drifting. Blowing snow will persist on Wednesday, but winds will slowly decrease throughout the day. Temperatures will have dropped noticeably on Wednesday as this system begins to pull down a cold arctic air mass.

Long Range

Conditions will finally calm down on Thursday as winds taper off. However, in the wake of this strong low we’ll see a blast of arctic air, with temperatures likely dropping into the minus twenties on Thursday and Friday. This frigid pattern is expected to persist for awhile, so make sure to get out those winter clothes!

Cool With Occasional Snow, Then Temperatures Plunge

Brad Leave a comment

The coming days will see a fair amount of cloud and several chances for snow, but temperatures will continue to be slightly above seasonal values. A big change is on tap for next week when a massive blast of Arctic air will plow through much of Canada and the United States, sending temperatures plummeting off a cliff. Time to dig out all the winter clothes.

More of the same. This weekend’s weather will bring little difference from the past several days as low cloud continues to linger through the region. The high temperature today will sit near -2°C with a light winds. Winnipeg & the Red River Valley may see some light isolated snow showers, but no accumulations are expected and for the most part it should just be a mainly cloudy day.

Temperatures will drop to a low near -5°C tonight with a few breaks in the cloud showing up overnight. Winds will pick up out of the south to about 15 km/h by Saturday morning.

Saturday may bring some sunshine through the morning hours, but skies will cloud back up through the afternoon ahead of the next low pressure system moving through. Temperatures should climb to a high near 0°C with continued south winds at 15-20 km/h. Heading into the evening, an area of light snow will spread eastwards into the province as a low pressure system moves into the Interlake from southeastern Saskatchewan. Temperatures will dip to a low near -2°C.

An area of snow will push across Southern Manitoba Saturday night into Sunday morning.
An area of snow will push across Southern Manitoba Saturday night into Sunday morning.

Sunday morning will see the snow gradually tapering off with total amounts close to 2 cm. After that Winnipeg will be left with mostly cloudy skies and the continued chance for some isolated light snow showers. Temperatures will remain steady near -2°C before falling to a low near -6°C on Sunday night under partly cloudy skies.

Long Range

Monday will bring the potential for another snow storm to the region as a low lifts northwards through eastern North Dakota into northern Minnesota. Best guesses at this point are for another 5-10 cm of snow over the Red River Valley and 10-20 cm over southeastern Manitoba. Slight changes in track could result in significant changes to forecast snowfall amounts, though, so we’ll have to keep an eye on it as this system develops through the weekend.

Behind that system, the big story will be the temperature crash over North America:

The GDPS is forecasting a substantial outbreak of Arctic air next week.
The GDPS is forecasting a substantial outbreak of Arctic air next week.

Temperatures over a large area are forecast to be 10-20°C below normal as a cold air mass crosses over the pole from Siberia into North America. Here in Manitoba, it appears like we’ll avoid the worst of it with temperatures dipping to seasonal to slightly below seasonal values, but to the west and south winter will be arriving in full force. After a November that saw every single day with above normal temperatures, it will likely be quite a shock to the system!

Winnipeg’s seasonal daytime high is currently -7°C while the seasonal overnight low is -16°C.