A stubborn Arctic High will keep temperatures on the cool side this week across Manitoba. Sun will give way to cloud, though, as a developing low in the United States looks likely to bring snow to the region.

An Arctic high over the region will keep winds light and temperatures cool in Winnipeg today. A sunny start to the day will give way to mixed skies as some high-level cloud begins to stream into the area from the southwest. This cloud cover is part of a low pressure system developing in the United States that will continue to extend its influence northwards over the next couple days. The Winnipeg area should see a high in the -20 to -15 °C range this afternoon with westerly winds of 10 to 20 km/h.

Mixed skies will continue overnight, gradually clouding over by Wednesday morning. Temperatures will dip to a low in the -25 to -20 °C range.

Through the night, snow will spread out of Montana and across southern Saskatchewan and into Manitoba. A broad area of snow will gradually work its way across southern Manitoba through Wednesday into the evening.

Temperatures will climb close to around -15 °C on Wednesday with light southerly winds. The winds will shift westerly in the evening and pick up into the 30–40 km/h range as this system exits the region. Temperatures will dip to a low close to -20 °C.

Indications are that this system will bring a notable snowfall to the region. As the snow pushes into the cold air over the region, its snow-to-liquid ratios (SLR) will climb. These values will likely reach into the 20:1 to 25:1 range and bring rather fluffy snow to the region.

For areas along and south of the Trans-Canada Highway corridor, it looks like 5 to 10 cm is likely by the time it tapers off. For areas north of this, a broad swath of 10 to 15 cm is likely for the Parkland and Interlake regions.

A few flurries will linger on Thursday as west-northwest winds continue in the 30 to 40 km/h range. Skies will gradually clear thorough the day with highs around -15 °C. The wind will drop off with clearing skies on Thursday night as temperatures head into the -25 to -20 °C range.

Long Range Outlook

The long range forecast for Winnipeg looks quiet with no major snow events on the horizon. Arctic highs will continue to dominate the weather pattern here and bring seasonably cool weather right through next week.

Today’s seasonal daytime high in Winnipeg is -10 °C while the seasonal overnight low is -21 °C.