What Is a Blowing Snow Advisory?
A Blowing Snow Advisory is issued by Environment and Climate Change Canada (ECCC) when blowing snow is expected to significantly reduce visibility and affect travel. Blowing snow occurs when strong winds lift loose snow from the ground, so hazardous conditions can develop even when no new snow is falling.
When Is a Blowing Snow Advisory Issued in Canada?
A Blowing Snow Advisory may be issued when strong winds are expected to lift loose snow from the ground and significantly reduce visibility. Environment and Climate Change Canada (ECCC) describes blowing snow as winds producing poor visibility of 800 metres or less.
Meteorologists consider factors such as forecast wind speeds, the amount and condition of snow on the ground, recent or expected snowfall, temperature, visibility and how exposed an area is to strong winds. Canada also uses an impact-based alert system, so the expected effects on travel and affected communities are considered when determining whether an advisory is needed.
Read More: How Do Meteorologists Predict Snow?
What to Expect During a Blowing Snow Advisory
Expect reduced visibility, drifting snow and rapidly changing conditions, particularly in open and exposed areas. Visibility may be relatively good in one location and deteriorate quickly along an exposed highway or rural road.
Blowing snow can occur while snow is falling or after a snowfall has ended if enough loose snow remains on the ground.
How Blowing Snow Can Affect Travel and Visibility
Blowing snow can make it difficult to see roads, vehicles, signs and other hazards. Poor visibility can contribute to slower traffic, collisions, road closures and travel delays.
Open highways and rural roads can be particularly affected because there are fewer trees and buildings to block the wind. Snow drifting across roads can create additional hazards.
What to Do When a Blowing Snow Advisory Is Issued
Check the latest weather forecast and road conditions before travelling. If you need to drive, allow extra time, reduce your speed and leave more distance between vehicles.
Be prepared for visibility to change quickly along your route. If conditions become severe, consider delaying unnecessary travel.
Continue checking the advisory for updates, as conditions and expected impacts can change.
Related Winter Weather Alerts
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Frequently Asked Questions
Yes. It means blowing snow is expected to create significant impacts, particularly reduced visibility and hazardous travel.
No. Strong winds can lift loose snow already on the ground, causing blowing snow even when no new snow is falling.
Yes, but driving may be hazardous because visibility can deteriorate quickly. Check road and weather conditions before travelling.
There is no fixed duration. The advisory remains relevant for the period when significant blowing snow impacts are expected. Check the alert issued for your area for its expected timing.
Sources
- https://www.canada.ca/en/services/environment/weather/severeweather/weather-alerts/weather-impact-guides.html#toc12
- https://www.canada.ca/en/environment-climate-change/services/seasonal-weather-hazards/severe-winter.html
- https://www.canada.ca/en/services/environment/weather/severeweather/weather-alerts/weather-impact-guides.html
