Storm attributes are detected by radar. Storm attribute alerts are only available to US locations, with the exception of some Canadian locations located within the footprint of US radar.
|
Alert Type |
Description |
|
Possible Tornado |
Radar detected a circulation capable of producing a tornado approaching the selected location. |
|
Severe Thunderstorm |
Radar detected storm capable of producing damaging winds 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. |
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