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While there will three categories – destructive, considerable and baseline – only storms that are classified as “destructive” will trigger a mobile notification.
The three categories are described as:
Destructive damage threat: At least 2.75 inch diameter (baseball-sized) hail and/or 80 mph thunderstorm winds. Warnings with this tag will automatically activate a Wireless Emergency Alert (WEA) on smartphones within the warned area.
Considerable damage threat: At least 1.75 inch diameter (golf ball-sized) hail and/or 70 mph thunderstorm winds. This will not activate a WEA.
Baseline or “base” damage threat: 1.00 inch (quarter-sized) hail and/or 58 mph thunderstorm winds. This will not activate a WEA. When no damage threat tag is present, damage is expected to be at the base level.