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Subject: NWS items for CAP-SC


Here are a few items we at NWS would like to see addressed on the CAP-SC.

- Discuss meaning of <expires> time and add a new optional element called <endTime>. NWS use of <expires> reflects the time at which the information in the message (about the subject event) has gone stale and should no longer be used. It comes from the expired time (aka purge time) in the UGC block of NWS alerts. We added an optional parameter called <eventEndTime> to reflect the expected end time of the event. This comes from the NWS VTEC. Some events do not have an expected end time, so we don't include the <eventEndTime> in those situations.

- There are a couple of ways <references> could be interpreted when multiple extended message identifiers are included in the tag. Which is allowed or are both allowed?

Scenario 1: The identifiers serially refer to previous messages about the event for the geocodes specified in the CAP message.

Scenario 2: The CAP message would serve as a follow-up to multiple CAP messages, each of which had different geocodes. To illustrate this, imagine the following. A Flash Flood Watch is issued. The Flash Flood Watch is later expanded to include an additional geocode. This results in a new CAP message with <msgType> of Alert to reflect the new area in the watch. Later on, the watch area is expanded again and another CAP message with <msgType> of Alert is issued to reflect the new area in the watch. Later, an Update CAP message is issued as a followup for the entire watch area. In this case, multiple identifiers would be used in the <references> tag where each of the previous messages had different geocodes. Thus, there wouldn't be a serial relationship between all of the CAP message referred to in the <references>.

- During an event, the subject of the event could have a location and move around within the threat area. This could be a storm, gunman, hazardous materials on a train, etc. For storms which can be pinpointed to a current location, such as a tornado, the NWS will include a parameter which describes the storm's location, direction of motion, and speed. Should an element be standardized in CAP which describes the location, direction of motion, and speed of the subject within the event?

fn:Mike Gerber
org:National Weather Service;Office of Climate, Water, and Weather Services
title:Physical Scientist

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