Towering cumulus cloud Isolated Thunderstorms Scattered Thunderstorms Widespread Thunderstorms Base/Top:  The base/top of the cloud in hundreds of feet.  For example 050/FL200 would be a cloud base of 5000 feet and a cloud top of 20,000 feet. Issued Time: The time the convective products was generated. Valid time:  The time range in which the conditions denoted on the graphic are expected in UTC. Valid time:  The time range in which the conditions denoted on the graphic are expected in local time. Convective Outlook