Plot Description:

This autoplot generates a map of active NWS Watch, Warnings, and Advisories active at the given timestamp.

Footnote on "Active" WaWA: A more complex than it should be nuance to explain here is the concept of what is "active" at a given timestamp. Let us consider a real world example. On Monday afternoon, the NWS issues a Winter Storm Warning for an upcoming storm that goes "into effect" at noon on Tuesday. You request this plot for a timestamp of 6 PM on that Monday. Is the Winter Storm Warning included in this metric at that time?

• Yes, if you select the option to include any WaWA that have been created, but may have an VTEC start time in the future yet.
• No, if you select the option to only include WaWA that have an issuance time before the given timestamp.

The default setting here is the first option, to include any events that have been created, but not necessarily having an issuance time prior to the given timestamp. This is why we can't have nice things!

If you turn on statistics, the legend displays active events nationwide. Central Region NWS maintains a similar map, but is near real-time only.

Autoplot 224 is closely related to this app and provides a table of stats.