Winter storm

A winter storm is when wind blows with precipitation that only happens when it's very cold, like snow, a mix of snow and rain, or freezing rain. These storms usually happen in cold places, such as areas far from the equator. While they are most common in winter, they can also appear in late autumn or early spring.

When a snowstorm has very strong winds and you can't see far ahead, it is called a blizzard. Winter storms can change how we live for a while, making roads slippery and sometimes stopping people from traveling. Understanding winter storms helps us stay safe and prepare for the cold, snowy weather.

Formation

Winter storms happen when warm, moist air rises high into the atmosphere. This creates low pressure near the ground and forms clouds. Hills or big mountains can push the air upward. The wind picks up moisture from lakes or oceans. If the temperature is below freezing, which is 0 °C (32 °F), the moisture falls as snow, ice, rain and snow mixed, ice pellets, or even graupel, which is soft hail. Cold air can't hold much moisture, so less rain or snow falls during winter storms.

In the United States of America, winter storm warnings are issued when snow builds up, when blowing snow makes it hard to see, when ice builds up, when large ice pellets form, or when the wind chill gets very cold with steady wind speed.

When snowstorms have very strong winds and very low visibility for several hours, they are called blizzards.

Terminology

Big winter storms can cover large areas for several days. Even if not all the area meets the exact conditions for a winter storm, the whole area might call the event a "storm." For example, a big winter storm in February 2021 brought snow and freezing temperatures as far south as Texas.

Snowstorm

Snowstorms happen when a lot of snow falls during a storm. Even just 2 inches (5 centimeters) of snow can make it hard to drive because roads become slippery. This is especially true in places where snow doesn't usually fall but sometimes gets a lot at once. In areas where snow is common, smaller amounts of snow usually don't cause as many problems because people are used to it and have ways to clear the roads.

Big snowstorms can be dangerous. Six inches (15 centimeters) of snow can make some roads impossible to drive on, and cars can get stuck. More than 12 inches (30 centimeters) of snow, especially in warmer places, can cause power to go out. Heavy, wet snow can break tree branches and power lines. Strong wind can pile up snow very high. These storms can make it hard to see outside, and sometimes people can get stuck in their cars and need help. It's important to stay safe and warm during snowstorms.

Freezing rain

Main articles: Ice storm and Freezing rain

Heavy freezing rain is a very dangerous kind of winter weather. It happens when warm air is above cold air, and the ground is below freezing. This makes the rain turn to ice when it hits the ground.

Even a small amount of ice can cause big problems. Driving can become unsafe, power lines can break, and crops can be damaged. For example, a big ice storm in 1998 affected parts of Canada and the United States, causing damage and leaving many people without power for weeks.

Preparing for winter storms

In places where winter storms happen, governments and health groups give advice on how to get ready for bad weather. Tips include having enough food, water, medicines, and cleaning supplies for three days. Keep warm clothes, a flashlight with extra batteries, and stay updated on weather news. Help your neighbors and avoid travel unless it is really needed.