US, Canada: Adverse winter weather forecast around the Great Lakes through at least Nov. 20 /update 1

Event

Bands of lake-effect snow are forecast downwind of the Great Lakes in parts of both the US and Canada through at least Nov. 20. A lake-effect snow event is developing downwind of lakes Erie and Ontario early Nov. 17 and will produce several inches of snow before dissipating. Further lake effect snow is expected around Lake Huron early Nov. 17. From late Nov. 17, more organized and persistent bands of snow will form, especially downwind of Erie and Ontario, through at least Nov. 20, producing several feet of snow over localized areas during the multi-day event. The heaviest snowfall is forecast around Buffalo, New York, where daily snowfall accumulations of around 46 cm (18 inches) are possible. Heavy snow accompanied by strong winds will likely lead to hazardous driving conditions due to ice and snow accumulations on roads, as well as reduced visibility.

Government Advisories
As of Nov. 17, the National Weather Service (NWS) has issued lake effect snow warnings for parts of western and northern New York. Winter storm warnings have been issued over parts of far northwestern, central, and southern Michigan and far northern Indiana. Winter weather advisories have been issued over parts of far northern Minnesota, central Michigan, far northeastern Ohio, northwestern Pennsylvania, and western and northern New York.

Environment Canada has issued snow squall warnings and watches over parts of southern Ontario, as well as special weather advisories. 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 is 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 likely 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
Environment Canada