The GOES CI product detected a 60% yellow area at 2045 UTC.  By 2115 UTC, a thunderstorm had developed in this yellow area.  This storm strengthened and prompted the issuance of a Severe Thunderstorm Warning by 2205 UTC. Baseball hail was reported by this storm at 2212 UTC, and a tornado was observed around 2242 UTC.  The CI product gave about 20-30 minute lead time for storm development, 75-90 minute for severe weather, and nearly 120 minutes of lead time for the weak tornado.

Michael Scotten.