Snow Squall

A snow squall is an intense, localized snow shower accompanied by gusty winds, sudden visibility reduction, and rapid temperature drop. In Canada, snow squalls are most commonly associated with cold fronts, lake-effect events, and strong arctic outbreaks. They can develop rapidly and produce near-zero visibility within minutes.

Snow Squall Hazards

• Near-zero visibility in seconds — dangerous for VFR flight and ground operations
• Sudden runway contamination — braking action changes rapidly
• Strong gusty winds with sudden shifts
• Flash freeze following the squall — wet surfaces become ice
• Blowing snow may persist after the squall has passed

Canadian Context

Lake Ontario, Georgian Bay, and Lake Huron are the primary generators of intense snow squalls in Canada. Post-frontal lake-effect squalls can drop 30–60 cm of snow in the lee areas within hours. Even areas not normally considered “snow belt” can be affected when wind direction lines up with a long fetch over the lake.

Related Terms

See also: Snow, Lake-Enhanced Precipitation, Cold Front.