Storm attributes are detected by NEXRAD radar. Storm attribute alerts are available to US locations including Alaska, Hawaii and Puerto Rico. Storm attribute alerts may be available to some Canadian locations located within 124nm of a US NEXRAD radar site.
|
Alert Type |
Description |
|
Possible Tornado |
Radar detected a TVS (Tornadic Vortex Signature) - Circulation capable of producing a tornado is approaching the selected location. |
|
Severe Thunderstorm |
Radar detected a mesocyclone with a DBZ above 55 - A storm capable of producing damaging winds is approaching the selected location. |
|
Severe Hail |
Radar detected a storm capable of producing hail with a diameter of 1 inch (2.5 cm) or greater approaching the selected location. Note: The NWS has recently changed the definition of Severe Hail from .75" to 1". |
|
Any Hail |
Radar detected a storm capable of producing hail of any size approaching the selected location. |
