Pleasant Weekend With Stormy End

Although temperatures will remain well below normal, we’ll see a pleasant weekend ahead when compared to the weather we’ve had as of late.

Friday

4°C / -14°C
Sunny.
Saturday

2°C / -4°C
Increasing cloudiness in the afternoon.
Sunday

2°C / -3·C
Cloudy; rain or snow beginning midday.

The next two days will be fairly nice despite the cool air that remains entrenched over the province. Both Friday and Saturday will provide plenty of sunshine and daytime highs climbing a few degrees above zero. We should see substantial snow-melt here in Winnipeg over the next two days thanks to that increasingly strong April sun. We’ll see a cooler night tonight as winds lighten up allowing us to radiate more heat away than the past couple nights. Temperatures will likely drop into the minus teens tonight while cloud cover will keep us substantially warmer on Saturday night.

Stormy Sunday

Precipitation totals for the daytime period on Sunday from the 00Z April 19 GDPS model.

For Sunday, an Alberta Clipper will make it’s way across Southern Manitoba and while many aspects of the system look to be relatively innocuous, it looks poised to pack a punch precipitation-wise. Snow will push into the Red River Valley midday, but the afternoon brings a particular challenge. Warm air will be advected northwards in the southeast flow ahead of this system, slowly warming the lower-levels of the atmosphere. Some indications are that preciptiation will switch over to rain in the afternoon, especially for the central Red River Valley and areas eastwards. It’s a very challenging problem and the phase of the precipitaiton will make a significant impact: around 10mm of liquid-equivalent precipitation and if it ends up falling as snow, that could quickly amount to another 6-10cm of the stuff. It’s almost a certainty that areas east of the Red River Valley will see mainly rain and areas west of the Red River Valley will see mainly snow.

At this point I think we’ll end up seeing a mix here in Winnipeg, with predominantly snow in heavier areas of precipitation. I’m not going to wager too much on accumulations right now; it’s likely that much of the snow will melt on contact with the ground as temperatures will likely remain just over the freezing mark. The system will move off overnight leaving clearing skies on Monday morning.

The Calm After the Storm

After a stormy start to the week over the entire Red River Valley, conditions will begin to settle down.

image

The low will move off into Ontario Today

Monday

Monday
image
Snow ending
-1°C / -6°C

The snow will gradually taper off over Southern Manitoba today, with many places seeing close to 5cm in total. Wind speeds will remain high, with values of 30 to 40km/h gusting up to 50-60km/h from the north. Temperatures today will be around or just below zero in Southern Manitoba, but of course the wind will make it feel a bit cooler than that.

Tuesday and Wednesday

Tuesday
image
Chance of Flurries
-1°C / -7°C
Wednesday
image
Chance of Flurries
1°C / -8°C

Tuesday will be a benign day weather-wise, with high temperatures generally just below zero in Southern Manitoba. The wind will be relatively light and from the north, making for a fairly comfortable day.

Wednesday will be a bit warmer than Tuesday, but otherwise there won’t be an significant changes in conditions. The wind will again be light and from the north, with only a slight chance of flurries.

Long Range

The long range forecast is beginning to show some glimmers of hope. Models are beginning to show signs of a pattern change towards normal or just above normal conditions as we move towards the end of April. Unfortunately, that means we’re likely stuck with well below normal weather at least through this week…but hopefully that will change in the not too distant future.

Winter Storm on the Way; Spring Still M.I.A.

Yet more winter weather is in store for Winnipeg as we remain stuck on the cold side of the jet stream while the main storm track through the Northern Plains of the United States becomes more active. While weather will remain relatively benign through today and tomorrow, things will become more active on Sunday and persist through much of next week.

Friday and Saturday

Friday

2°C / -9°C
Chance of scattered flurries this morning. Becoming a mix of sun and cloud.

We’ll see the chance of some scattered flurries through the Red River Valley this morning as a weak trough hangs back into Southern Manitoba from the low pressure system walloping Southern Ontario. Any snow that falls will be light and non-accumulating. Through the day the skies will break up a bit and we’ll end up under a mix of sun and clouds with a high near 2°C here in the city and closer to -1 or 0°C elsewhere in the Red River Valley. Tonight we’ll see partly cloud skies with temperatures dropping to around -8 or -9°.

Saturday

4°C / -7°C
Mostly sunny.

On Saturday, we’ll see fairly sunny skies with the warmest temperatures we’ve seen in a while1 as our daytime high rockets all the way to a balmy 3 or 4°C! Winds will remain relatively light out of the northeast throughout the day. Clouds will begin to move in through the overnight period in advance of the next weather system as we drop to around -7 or -8°C.

Sunday into Monday

Sunday

3°C / -4°C
Cloudy. Slight chance of showers or flurries in the afternoon. Snow beginning overnight.

Here comes winter. A major storm system will push out of Wyoming through South Dakota on Saturday night and into central North Dakota through the day on Sunday. Convection will fire up to the east of the low which will supply moisture that will wrap northwards and westwards through an area of strong lift on the north side of the low. This area of precipitation will push northwards through N. Dakota into Southern Manitoba pushing northwards to Winnipeg by Sunday evening. Light snow will begin overnight as winds strengthen out of the north.

GDPS 12hr. precipitation forecast with surface pressure.

GDPS 12hr. precipitation forecast with surface pressure.

By Monday morning the low pressure system is forecast to be near Lake-of-the-Woods with a strong pressure gradient situated over the Red River Valley. Snow will be wrapping around the back side of this system into the valley while strong northerly winds of 40-50km/h help blow it around. Temperatures will, fortunately, be near the freezing mark, but with the strong winds and damp air it will feel quite cool.

The system should leave the region overnight Monday with a cool, benign weather pattern settling in once again.


  1. It’s rather depressing that +3°C can possibly be the warmest temperatures we’ve had in a while when it’s mid-April. 

More Snow on the Way

sigh

image

850mb wind forecast showing the deep southerly flow that will be providing the moisture and lift for today’s system.

Today

image
0°C / -2°C
Snow beginning this afternoon. 2-4cm overnight.

A frontal wave sliding across the Prairies will push into Southern Manitoba this morning, spreading snow eastwards across the Red River Valley this afternoon. While southwestern Manitoba will see 5–10cm of the white stuff, we should fare a little better here in the RRV with 5cm expected near the US border tapering off to 2–4cm here in Winnipeg. The bulk of the snow will fall this evening into the overnight period before tapering off late overnight or early tomorrow morning.

Saturday & Sunday

Saturday
image
1°C / -11°C
Cloudy with a chance of flurries. Clearing late in the day.
Sunday
image
-4°C / -14°C
Increasing cloud. Light snow beginning in the afternoon.

Saturday will be a bit of a mixed bag with some lingering flurries in the morning and gradual clearing in the afternoon before skies clear late in the afternoon or evening. The high temperature on Saturday should be around 1°C and we’ll see temperatures drop to –11 or –12°C Saturday night.

More snow looks to be on the way for Sunday afternoon as an Alberta Clipper slides along the international border. At this point, it doesn’t look like a significant system, but it should pack enough of a punch that it will likely drop a couple cm through the RRV in the afternoon. After Sunday, it looks like we’ll slip back into another benign pattern with below-normal temperatures as a surface ridge keeps snowier weather to our west and to our south.