Winter Storm Warning USA: What It Means & How to Stay Safe Winter storms in the USA can bring freezing temperatures, heavy snow, ice storms, and strong winds , posing serious risks to lives and properties. When the National Weather Service (NWS) issues a Winter Storm Warning , it means severe winter conditions are expected or already occurring. Understanding what to do can make a crucial difference in staying safe. What Is a Winter Storm Warning? A Winter Storm Warning is issued when significant snowfall, sleet, or freezing rain is expected within 12 to 36 hours. These conditions can make travel dangerous and increase the risk of hypothermia, frostbite, and power outages. Unlike a Winter Weather Advisory , which signals less severe conditions, a Winter Storm Warning indicates hazardous and life-threatening weather. Key Differences Between Winter Weather Alerts: Winter Storm Watch – A storm may develop within the next 48 hours. Winter Weather Advisory – Winter weather is ...