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.
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).
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.