When a burst of heavy snow is detected on radar. It is a polygon warning, generally 30-60 minutes in duration, that is issued similar to severe thunderstorm and tornado warnings, starting November 1.

Snow squalls have historically led to major highway pileups. Here's what to know about these short-lived bursts of snow.

There is no safe place on the road during a snow squall. When snow squalls are in the forecast, the safest action is to avoid or delay travel. Monitor the latest forecasts and warnings on weather.gov or your local National Weather Service Forecast Office before heading out.

It’s that time of the year to watch out for one of the most dangerous winter hazards on the road Snow squall vs. Snowstorm: What’s the difference? From the National Weather Service: The main difference between a snow squall and a snowstorm is duration.