The National Weather Service (NWS) has criteria that must be met to issue a
severe weather alert. As an example, for a thunderstorm to be considered
severe, it must contain hail of 1 inch or greater and/or winds of 58
miles per hour or greater. These are thresholds the NWS defines when
storms start causing structural damage and are a substantial threat to
people. So it's possible to experience small hail and strong winds and
not be under a thunderstorm warning.
What does this mean for Storm Shield users? If your current or saved locations fall outside these thresholds (even though you may be in what appears to be severe weather) you would not receive an alert from Storm Shield, because Storm Shield adheres to the same NWS standards.