US, Canada: Adverse winter weather forecast across parts of the north-central US and south-central Canada through at least April 21 /update 1

Event

Adverse winter weather is forecast across parts of the north-central US and south-central Canada through at least April 21. As one winter storm system over central and eastern Montana, northeastern North Dakota, southeastern Saskatchewan, and southwestern Manitoba tapers off April 20, another system arrives just to the east over northeastern North Dakota, northern Minnesota, far northern Wisconsin, southeastern Manitoba, and southwestern Ontario late April 20-Arpil 21. Snowfall accumulations of up to 10-25 cm (4-10 inches) are possible across parts of the affected area. Strong winds are also possible in the region and the combination of heavy snowfall and strong winds could lead to blizzard conditions in places. Hazardous driving conditions are likely across the affected areas due to icy roads and reduced visibility caused by blowing snow.

Government Advisories
As of April 20, the National Weather Service (NWS) has issued winter storm warnings for parts of central Montana, northeastern North Dakota, and northeastern and north-central Minnesota. Winter weather advisories have been issued across much of the rest of the affected area.

The Meteorological Service of Canada has issued red winter storm and snowfall warnings for parts of southeastern Saskatchewan, southern Manitoba, and southwestern Ontario. Weather advisories have also been issued for parts of southwestern Ontario. Officials could update and possibly extend the coverage of weather alerts over the coming days.

Hazardous Conditions
Snow accumulations are likely across the affected area, especially at higher elevations. Lesser accumulations are possible where sleet and freezing rain mix with the snow, and precipitation are less intense. In addition to the heavy snow, strong wind gusts will likely lead to periods of blowing and drifting snow in some areas. Blizzard conditions are possible. Sporadic power outages could occur throughout the affected area.

Transport
The winter weather will likely cause ground and air transport disruptions over the coming days. Traffic and commercial trucking delays are possible along regional highways. Dangerous and challenging driving conditions are also likely on secondary and rural roads in the affected states as maintenance crews prioritize clearing major routes. Authorities could close stretches of highways if driving conditions become too hazardous. Flight delays and cancellations are possible due to ground stops and deicing operations at regional airports.

Advice

Monitor local media for updated weather information. Verify road conditions before driving in areas where heavy snowfall is forecast. Allow extra time to reach destinations in these areas and carry an emergency kit and warm clothes if driving is necessary, especially on secondary or rural routes that could become impassable. If routing shipments by truck through the affected area, plan accordingly for delivery delays. Confirm flights. Charge battery-powered devices in the case of prolonged electricity outages.

Resources

National Weather Service
Weather Prediction Center
Meteorological Service of Canada