Understanding Winter Storm Terminology: A Guide to Professional Weather Forecasts

Winter storms can pose significant threats to safety, transportation, and daily activities. Understanding the terminology used by meteorologists helps individuals respond appropriately to these events.

What Are Winter Storm Watches, Warnings, and Advisories?

The National Weather Service (NWS) employs specific terms to communicate the severity and timing of winter weather events:

• Winter Storm Watch: Issued when conditions are favorable for a winter storm to develop, typically 24 to 72 hours in advance. (weather.gov)

• Winter Storm Warning: Issued when a winter storm is imminent or occurring, posing a threat to life and property. (weather.gov)

• Winter Weather Advisory: Issued for less severe winter conditions that may cause significant inconvenience but are not expected to be life-threatening. (weather.gov)

What Is a Winter Storm?

A winter storm involves a combination of snow, sleet, freezing rain, or blowing snow that meets specific criteria:

• Snow: Accumulations of 6 inches or more in 12 hours, or 8 inches in 24 hours. (weather.gov)

• Sleet: Ice pellets that cause slippery surfaces.

• Freezing Rain: Rain that freezes upon contact, creating hazardous ice layers.

• Blowing Snow: Snow lifted by winds, reducing visibility.

What Is a Blizzard?

A blizzard is characterized by:

• Wind: Sustained winds or frequent gusts of 35 mph or more.

• Visibility: Reduced to less than 1/4 mile due to falling and/or blowing snow.

• Duration: Conditions persisting for at least 3 hours. (weather.gov)

What Is an Ice Storm?

An ice storm involves significant ice accumulation, typically 1/4 inch or more, leading to hazardous conditions. (weather.gov)

How Do Winter Weather Advisories Differ from Warnings?

Advisories are issued for less severe conditions that may cause significant inconvenience but are not expected to be life-threatening. Warnings are issued when hazardous conditions pose a threat to life or property. (weather.gov)

How Can I Stay Prepared for Winter Storms?

• Stay Informed: Regularly check local forecasts and heed NWS alerts.

• Prepare an Emergency Kit: Include essentials like water, non-perishable food, medications, and warm clothing.

• Develop a Safety Plan: Know evacuation routes and have a communication plan with family members.

By understanding these terms and taking proactive measures, you can enhance your safety during winter storms.

Highlights:

• National Weather Service Expanded Winter Weather Terminology
• Winter Watch, Warning and Advisory Definitions
• Winter Weather Terms