A significant weather advisory (alternately known as a "significant weather alert", the terminology varies depending on the local National Weather Service forecast office) is issued when doppler weather radar indicates a strong thunderstorm is producing small hail or high winds whose strength does not reach severe thunderstorm criteria. It does not necessarily account for lightning or flooding.
This alert product was created in the early 2000s, and is sometimes a precursor to a severe thunderstorm warning. Many versions of the First Warning weather alert system used by broadcast television stations have begun including significant weather alert into their systems, however, these systems usually classify such an advisory terms such as "Heavy T-Storms", "Heavy Storms" or "Strong T-Storms" (terms used by the system prior to the inclusion of the product).
Read more about Significant Weather Advisory: Criteria, Example of A Significant Weather Advisory, See Also
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