Snow Squalls and Snow Squall Warnings: Why a Short Burst of Snow Is So Dangerous
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How we wrote this: A plain-English summary of National Weather Service safety guidance, checked October 29, 2026. Always follow your local NWS forecast office.
What a snow squall is
Snow squalls are often tied to strong cold fronts. The National Weather Service describes them this way:
- They move in and out quickly, usually lasting less than an hour, often 30 to 60 minutes, and they're extremely intense.
- Sudden white-out conditions combine with falling temperatures to ice over roads in just a few minutes.
- Snow totals are often an inch or less. The danger comes from gusty winds, falling temperatures and quick drops in visibility.
- They can happen even when no large winter storm is in progress.
- There is a long history of deadly traffic accidents, including chain-reaction crashes, linked to snow squalls.
A snowstorm can last hours or days. The difference is duration.
Snow Squall Warnings
Snow Squall Warnings are short-fused and cover distinct areas, much like tornado and severe thunderstorm warnings.
What to do
- If a warning covers your area, avoid or delay travel until the squall passes. The NWS says there's no safe place on the highway during a squall.
- If you're already driving and can't exit in time:
- slow down;
- turn on your headlights and hazard lights;
- leave plenty of distance to the car ahead;
- don't slam on the brakes.
- Before winter trips, check the forecast and keep an emergency kit in the car.
Related: lake effect snow, ice storms and black ice, winter weather alerts.