This Learning Center provides educational reference material only. It does not originate watches, warnings, or advisories. For active alerts, check official National Weather Service products and local emergency management channels.
Alert polygons
Understanding Alert Polygons
Learn how alert boundaries are drawn and what they mean for your location.
Alert polygons
Understanding Alert Polygons
Alert polygons show the geographic area covered by an NWS watch, warning, or advisory.
Inside vs outside
If your location is inside an alert polygon, read the full alert text and follow official instructions from local authorities.
