Re: [emergency-cap] FW: CAP Cancel question

[Mike Gerber - NOAA Federal <mike.gerber@noaa.gov>]

But Update forces a new broadcast, correct?

Mike

On Thu, May 9, 2019 at 8:20 AM Ham, Gary (CTR) <Gary.Ham@associates.fema.dhs.gov> wrote:

Mike,

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Message type update also removes the message and replaces with the new message. So, cancel if no new info is needed. Update if new message is needed to go out on the phones.

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Vr,

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Gary Ham (CTR)

Contractor via Arc Aspicio

FEMA/NCP IPAWS

Systems Architect, IPAWS-OPEN

Mobile Phone: 703-899-6241

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From: Mike Gerber - NOAA Federal <mike.gerber@noaa.gov>
Sent: Thursday, May 9, 2019 8:03 AM
To: Gary Ham <garyham@grandpaham.com>
Cc: <emergency-cap@lists.oasis-open.org> <emergency-cap@lists.oasis-open.org>; Elysa Jones <elysajones@yahoo.com>; Ham, Gary (CTR) <Gary.Ham@associates.fema.dhs.gov>; Jacob Westfall <jake@jpw.biz>; Lucero, Mark <Mark.Lucero@fema.dhs.gov>; Rex Brooks <rexb@starbourne.com>
Subject: Re: [emergency-cap] FW: CAP Cancel question

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Thanks, Gary. So the only way to stop WEA broadcast (e.g. threat moves out of the alert area) at this time is to use msgType âCancelâ- is that correct?

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Mike

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On Wed, May 8, 2019 at 7:55 PM Gary Ham <garyham@grandpaham.com> wrote:

For the record, IPAWS uses cancel in the following ways:

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For WEA it means take the canceled message out of service immediately. That is semantically different than an affirmative âall Clearâ as a new message referencing the previous message. The new longer 360 character message may make use off AllClear more valuable. AllClear is actually disallowed in the original ATIS Standard. That way also be true in the new standard. I would have to check.

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For EAS, it means take the message out of further broadcast rotation. Actually it has almost no effect as EAS messages are rarely re-broadcast anyway. It does not create a new broadcast message. This is based on EAS Industry Group guidance.

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For the IPAWS Feed of Public messages, it is undefined. It is put on the feed and consumers will need to interpret the meaning for themselves.

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IPAWS does not accept a cancel for a message that has already expired. ÂâYou cannot kill a dead man."

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vr,

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Gary Ham (CTR)
Contractor via ArcAspicio
FEMA/NCP IPAWS
Systems Architect, IPAWS-OPENÂ
Mobile Phone: 703-899-6241
e-mail: garyham@grandpaham.com

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On May 8, 2019, at 4:55 PM, Jacob Westfall <jake@jpw.biz> wrote:

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Thanks, Gang. I wasn't sure if Cancel had formally been re-defined or clarified in any formal documentation. Â

Prior to CAP 1.2 and the introduction of AllClear, as Rex noted, it was common practice and that still continues to this day. Ideally for new CAP issuers, they should start out with the recommended practice of using AllClear. But there is no requirement that long-standing CAP users stop using Cancel. You are right that it might introduce some consequences for downstream systems who are used to your current practices.

If you are looking at any changes, I would recommend introducing AllClear for the responseType in the appropriate info blocks. This can work in conjunction with your current Cancel practices and provide a migration path for users down the road if you decide to change Cancel.

--
Jacob Westfall <jake@jpw.biz>

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Mike Gerber
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Mike Gerber
National Weather Service
Office of Dissemination