What’s the difference between winter storm warnings, watches and advisories

CLEVELAND — Imagine this: It’s late January. The sky turns gray while snowflakes begin to fall and your phone alerts you that a Winter Storm Warning is in effect. You dismiss it as nothing more than a few inches of snow. After all, snow is common during the winter months. You’ve seen it before, and you can handle it… Right? 

The roads become completely covered with heavy ice during the night. 

Vehicles slip, slide and lose control.  Power lines break. Traffic is snarled. The morning rush is at a standstill. And you are stuck. 

That important meeting with your boss: you missed it. Your neighbor, however, also heard the warning and knew what was coming. She rescheduled her appointments and worked from home via Zoom. She bought everything she needed ahead of time and spent the day keeping herself protected from the storm.  

The ability to identify winter weather conditions becomes essential for survival during winter storms. Winter weather watches, warnings and advisories are issued to help you prepare. But each of those terms have different meanings. And you need to know the difference. They are more than just words. Understanding these important terms can mean the difference between inconvenience and disaster.  

The National Weather Service meteorologists release public alerts about snow, sleet, ice and freezing rain during the winter months. The system generates three types of alerts which include watches, warnings and advisories. Each of these reflect different levels of impact on your life. But numerous individuals fail to recognize what they mean or, worse, just choose to disregard them. The knowledge of storm-related terminology enables you to make the right choices for you and your family before a storm arrives.  

A winter storm watch is like a yellow caution light. It tells you that conditions are right for a major winter storm to occur although it has not been confirmed or has not yet arrived. Meteorologists track storm development, observing all necessary elements including cold air, moisture and lift. They still need to determine the exact location and intensity of the potential storm. In technical terms: The National Weather Service issues a watch when hazardous winter conditions are possible in the next day or two. The storm hazards include snowfall exceeding 6 inches in northern states (2 to 4 inches in southern U.S. states), dangerous ice accumulation or blizzard conditions in the next 24 to 48 hours ahead. In plain language: Think of it as “heads up” mode. A winter storm COULD happen in your area. You should avoid both panic and hasty store visits at this time, but continue to plan ahead. Check your supplies while performing your car winter readiness check and stay informed about upcoming weather conditions.  

A winter storm warning is the red alert. It means dangerous winter weather is either happening now or will begin very soon. The situation could pose a threat to human life and property if you have not prepared. It means heavy snow, perhaps coupled with freezing rain, and blizzard conditions are moving in. In scientific terms: A warning is issued when hazardous winter weather is imminent or already occurring. It includes heavy snowfall exceeding 6 inches in 12 hours in northern states (2 or 4 inches in southern areas), and significant ice accumulation or whiteout conditions from high winds. In plain language: A warning indicates that the game is about to start. Stay off the roads if you can, bring pets and supplies inside, and hunker down. The area faces three main risks which include power outages, road closures and dangerous icy conditions.  

A winter weather advisory is less severe than other weather alerts, yet it remains important. The National Weather Service issues this alert when winter weather will create travel difficulties although it will not meet warning criteria. In scientific terms: An advisory is issued for smaller amounts of snow (like 2–5 inches), light ice, or a mix that makes roads slick and visibility poor. Advisories are issued for slick conditions which lead to accidents and service disruptions. In plain language: An advisory indicates that people should reduce their activities or just take it slow. You can probably go about your day, but drive carefully, dress warmly, and give yourself extra time to get where you’re going.  

Here’s an easy way to think of it: Let’s make a pizza. A watch means you’ve got all the ingredients on the counter including the dough, the sauce, the cheese, and you’re about to start baking. The ingredients are ready but the pizza needs additional time to complete. A warning means the pizza has finished baking in the oven and is now hot and ready to serve. The storm has transitioned from a theoretical possibility to an active event which is currently occurring or will start soon.  

A watch = it’s possible a storm might happen. You should prepare just in case. 

Warning = it’s happening. The storm is here or will hit soon. Take action to protect you and your family. A winter storm watch requires you to begin your preparation for the upcoming storm. The storm has finished developing when it reaches a “winter storm warning” stage so people need to start taking necessary precautions. 

An advisory is for weather that is less severe. It’s arriving soon, but is only inconvenient or disruptive.  

Understanding the differences between these important winter weather alerts can keep you safe while helping you protect your family, pets and possessions. This knowledge helps you avoid dangerous circumstances that might lead to accidents, getting stranded or hurt. 

Your local meteorologist is your most accurate source for this information. They know your area best. Check for alerts and updates often and share information with your family and friends. Safety should be your top priority during dangerous weather conditions.