The NWS uses a multi-tiered system for forecasting hazardous weather. The alerts issued range from outlooks (for long lead time) to advisories and warnings (for periods of 2 days or less).
Use the glossary to get a definition to any word you might not or have questions about. The glossary covers weather words from the simple to the complex.
How does the National Weather Service issue advisories? What advisories are issued to keep you informed of hazardous and dangerous weather?
Do you know what to do when a watch, warning or advisory is issued? Learn where to go and what to do when severe weather threatens.
How do tornadoes form? Where and when do hurricanes form? Learn about severe weather and events in this section.