Hail guides
Hail radar and ground reports: how to read an alert
For any business acting on hail, the key question is what an alert actually supports. HailSignal separates estimated hail size from confidence in the evidence.
Radar provides an indication
Radar measures storm properties. These help estimate where hail occurs and how large it may be. A strong radar signal alone is not yet on-site confirmation.
From signal to confidence
C1 means an initial radar signal. C2 is based on consistent radar evidence or an additional independent indication. Verified ground reports can raise the confidence level further.
Check independent evidence
C3 means independently supported, for example by a ground report matching the location and time. Its value also depends on the content and precision of that report. C4 indicates on-site confirmation.
Before you act
Review the time, location, estimated size and confidence level together. A projected track estimates future movement; it does not prove hail fell along the entire line. An unconfirmed event is not the same as a disproved event.