Winter storm, decoded. One system, three kinds of trouble.
A winter storm is not one kind of weather. It is a storm system that can bring snow, sleet, and freezing rain all in the same day, sometimes all in the same county, and the danger is less about any single flake than about the roads underneath it. This page is the short version of what counts as a winter storm, how it differs from a blizzard and an ice storm, and the one decision that matters most when one is forecast: stay off the roads if you can, and do not underestimate the ice.
WHAT IT ACTUALLY IS.
Snow, sleet, and freezing rain, from one system.
A winter storm forms when a low-pressure system pulls cold air into place and lifts moist air until it falls as winter precipitation — snow where the air stays below freezing all the way down, sleet where snowflakes melt and refreeze into ice pellets on the way down, and freezing rain where rain falls onto surfaces below freezing and glazes them in ice. The mix matters because each type changes the roads differently: snow buries them, sleet pellets bounce and pile up, and freezing rain turns them into a skating rink you cannot see. That is why one storm can close schools in one county for snow and knock out power in the next for ice.
HOW IT DIFFERS.
Not every winter storm is a blizzard. Not every ice event is an ice storm.
A Winter Storm Warning is issued when hazardous winter weather — snow, sleet, freezing rain, or a mix — is expected to make travel dangerous, with the exact accumulation thresholds set locally, because a few inches paralyze one city and barely register in another. A blizzard is stricter: it additionally requires sustained winds of 35 mph or more and visibility under a quarter mile for at least three hours, so a heavy snow with calm air is a winter storm, not a blizzard. An ice storm is the narrow case of prolonged freezing rain that coats trees, power lines, and roads in glaze ice — the heaviest damage usually comes from the ice, not the snow.
WHAT TO DO ABOUT IT.
Stay off the roads. If you must go, go prepared.
The safest action during a winter storm is to stay off the roads until plows and salt have done their work, since most winter-storm injuries happen in cars, not houses. If you must drive, go slowly, keep extra distance, and carry a blanket, a phone charger, water, and snacks — and let someone know your route and when you expect to arrive. Brzzy's forecast, live radar, and severe weather alerts turn the same kind of ground truth into a plain-language answer before the storm arrives: go now, or stay in before the sky closes the roads for you.
What is a winter storm?
A winter storm is a storm system that brings hazardous winter weather — snow, sleet, freezing rain, or a mix of them — in amounts expected to make travel dangerous. It is the broad term; blizzards and ice storms are narrower, stricter kinds of winter storm.
How is a winter storm different from a blizzard?
A blizzard additionally requires sustained winds of 35 mph or more and visibility under a quarter mile for at least three hours. A winter storm can drop heavy snow in calm air and still be dangerous without ever meeting the blizzard criteria.
How is a winter storm different from an ice storm?
An ice storm is the narrow case of prolonged freezing rain that coats trees, power lines, and roads in glaze ice. A winter storm may bring ice as one ingredient, but an ice storm is defined by the ice doing the damage.
What should I do during a winter storm?
Stay off the roads if you can — most winter-storm injuries happen in cars. If you must drive, go slowly, keep extra distance, and carry a blanket, a phone charger, water, and snacks, and let someone know your route and expected arrival time.
Does Brzzy warn me about winter storms?
Brzzy shows your local forecast with hourly updates, live radar, severe weather alerts, GIF forecasts, and activity ratings that weigh the sky for your plans. Brzzy is free to download on iPhone.
More from Brzzy: Full weather glossary, Snow, Freezing rain
