Blizzards

A blizzard is a severe snowstorm characterized by strong winds and low temperatures, often accompanied by blowing snow. Blizzards can result in dangerous conditions such as low visibility and extreme cold. Understanding the science behind blizzards is important for staying safe and prepared during these events.

Causes of Blizzards

Blizzards typically occur when a mass of cold, dense air collides with a warm, moist air mass. This collision can result in the rapid development of a low-pressure system, which brings about heavy snowfall and high winds. The strong winds then cause blowing and drifting snow, reducing visibility and creating hazardous conditions.

Conditions for a Blizzard

Several conditions must be met for a storm to be classified as a blizzard. These include sustained winds of at least 35 miles per hour (56 kilometers per hour) and visibility of less than a quarter mile (0.4 kilometers) due to blowing or falling snow. These conditions typically persist for a prolonged period of time, often several hours.

Staying Safe During a Blizzard

During a blizzard, it's crucial to stay indoors if possible and to avoid travel unless absolutely necessary. If you must go outside, dress warmly in layers and ensure that all exposed skin is covered to prevent frostbite. It's also important to have emergency supplies on hand, such as food, water, and blankets, in case of power outages or other disruptions.

Study Guide

1. What are the main characteristics of a blizzard?
2. Describe the conditions that lead to the formation of a blizzard.
3. What are the minimum wind speed and visibility requirements for a storm to be classified as a blizzard?
4. What precautions should you take to stay safe during a blizzard?