Plot Description:

This plot presents the accumulated frequency of duration for a given NWS VTEC Watch, Warning, Advisory product. The complication with this tool is that some alerts are issued for zones and others are for counties. If you do not find results for one, try switching to the other.

When you plot by a WFO, this tool will treat each individual combination of a VTEC event and UGC has an individual event.

There's a second major complication and that is the case of watches and how VTEC handles issuance and expiration time. Some watches are issued for time periods well into the future and are either cancelled or upgraded prior to the VTEC issuance time. In those cases, this app considers the wall clock issuance time of the watch as the start time and the wall clock time when the watch was either cancelled or upgraded. In this case, both lines are presented as equal.