<aside> 💡 This page contains everything I have learnt about Common Alerting Protocol (CAP).
</aside>
Standard protocol for dissemination of information on weather events. It is structured both for human and machine consumption. It is XML-based.
The CAP however, does not seem to be in the format I expected. It only contains the components necessary for human consumption. The weather alert as text and nothing else. Anything else like polygons and severity is not present. Perhaps there is something I am missing?
Yes I was missing something. First we have an RSS feed that gives out CAP alerts and each item in there is a CAP alert. The link in each item takes you to the specific CAP alert. In there, you find all the details about the CAP alert like the location and severity.
<?xml version="1.0" encoding="UTF-8" ?>
<rss xmlns:dc="<http://purl.org/dc/elements/1.1/>" version="2.0">
<channel>
<link rel="alternate" title="RSS" href="<http://alert-feed.worldweather.org/mw-met-en/rss.xml>" type="application/rss+xml"/>
<title>Latest Official Public alerts for Malawi: Meteorological Services</title>
<link><http://alert-feed.worldweather.org/mw-met-en/rss.xml></link>
<description>This feed lists the most recent Official Public alerts for Malawi: Meteorological Services uploaded to the Filtered Alert Hub.</description>
<language>en</language>
<copyright>public domain</copyright>
<pubDate>Wed, 19 Jul 2023 14:30:03 GMT</pubDate>
<lastBuildDate>Tue, 12 Jan 2021 10:36:00</lastBuildDate>
<docs><http://blogs.law.harvard.edu/tech/rss></docs>
<image>
<title>Latest Official Public alerts for Malawi: Meteorological Services</title>
<url><http://alert-feed.worldweather.org/mw-met-en/capLogo.jpg></url>
<link><http://alert-feed.worldweather.org/mw-met-en/rss.xml></link>
</image>
<item>
<title>Mwera winds over Lake Malawi and other water bodies</title>
<link><https://alert-hub-hko.s3.amazonaws.com/mw-met-en/2023/07/19/14/29/2023-07-19-14-30-00-901-2b1e9.xml></link>
<description>Strong Mwera winds with speeds of upto 45km/h are expected to be blowing over Lake Malawi,Lake Malombe,Lake Chilwa and Shire river which are expected to cause high water waves of 1 to 2 meters.</description>
<category>Met</category>
<pubDate>Wed, 19 Jul 2023 14:25:12 +0000</pubDate>
<guid isPermaLink="false">urn:oid:2.49.0.1.454.0.2023.7.19.14.25.12</guid>
<dc:creator>[email protected] (Malawi Department of Climate Change and Meteorological Services)</dc:creator>
<dc:date>2023-07-19T14:25:12+00:00</dc:date>
</item>
<item>
<title>Mwera winds over Lake Malawi and other water bodies</title>
<link><https://alert-hub-hko.s3.amazonaws.com/mw-met-en/2023/07/06/08/54/2023-07-06-08-55-01-372-5e28b.xml></link>
<description>Strong Mwera winds with speeds of greater than 65km/h are expected to be blowing over Lake Malawi,Lake Malombe,Lake Chilwa and Shire river which are expected to cause a wave height of 3 meters.</description>
<category>Met</category>
<pubDate>Thu, 06 Jul 2023 08:50:54 +0000</pubDate>
<guid isPermaLink="false">urn:oid:2.49.0.1.454.0.2023.7.6.8.50.54</guid>
<dc:creator>[email protected] (Malawi Department of Climate Change and Meteorological Services)</dc:creator>
<dc:date>2023-07-06T08:50:54+00:00</dc:date>
</item>
<item>
<title>TROPICAL CYCLONE GOMBE</title>
<link><https://alert-hub-hko.s3.amazonaws.com/mw-met-en/2022/03/10/14/30/2022-03-10-14-30-44-922-b9224.xml></link>
<description>Tropical Cyclone Gombe is expected to propel Torrential rains, violent winds and cause flash floods over southern Malawi.</description>
<category>Met</category>
<pubDate>Thu, 10 Mar 2022 14:22:16 +0000</pubDate>
<guid isPermaLink="false">urn:oid:2.49.0.1.454.0.2022.3.10.14.22.16</guid>
<dc:creator>[email protected] (Malawi Department of Climate Change and Meteorological Services)</dc:creator>
<dc:date>2022-03-10T14:22:16+00:00</dc:date>
</item>
<item>
<title>TROPICAL CYCLONE GOMBE</title>
<link><https://alert-hub-hko.s3.amazonaws.com/mw-met-en/2022/03/10/14/30/2022-03-10-14-30-45-027-6eaa0.xml></link>
<description>Tropical Cyclone Gombe is expected to propel Torrential rains, violent winds and cause flash floods over southern Malawi.</description>
<category>Met</category>
<pubDate>Thu, 10 Mar 2022 14:18:31 +0000</pubDate>
<guid isPermaLink="false">urn:oid:2.49.0.1.454.0.2022.3.10.14.18.31</guid>
<dc:creator>[email protected] (Malawi Department of Climate Change and Meteorological Services)</dc:creator>
<dc:date>2022-03-10T14:18:31+00:00</dc:date>
</item>
<item>
<title>Volcanic alert level 4</title>
<link><https://alert-hub-hko.s3.amazonaws.com/mw-met-en/2021/08/29/14/38/2021-08-29-14-38-13-289-15377.xml></link>
<description>Alert level 4 is current. Danger in caldera and flanks.</description>
<category>Met</category>
<pubDate>Fri, 29 Sep 2017 23:23:26 +0000</pubDate>
<guid isPermaLink="false">2.49.0.0.548.0.VU.170929232326.03wGC4X2aCmAc2NBm0Ec</guid>
<dc:creator>[email protected] (Vanuatu Meteorology and Geo-Hazards Department)</dc:creator>
<dc:date>2017-09-29T23:23:26+00:00</dc:date>
</item>
<item>
<title>Volcanic alert level 3</title>
<link><https://alert-hub-hko.s3.amazonaws.com/mw-met-en/2021/08/29/14/38/2021-08-29-14-38-12-851-ecfe4.xml></link>
<description>Alert level 3 is current. Danger on crater rim and flanks.</description>
<category>Met</category>
<pubDate>Fri, 29 Sep 2017 23:23:26 +0000</pubDate>
<guid isPermaLink="false">2.49.0.0.548.0.VU.170929232326.0pdVAW5c6wwqM4W4XtVy</guid>
<dc:creator>[email protected] (Vanuatu Meteorology and Geo-Hazards Department)</dc:creator>
<dc:date>2017-09-29T23:23:26+00:00</dc:date>
</item>
<item>
<title>Mwera Wind, over lake Malawi</title>
<link><https://alert-hub-hko.s3.amazonaws.com/mw-met-en/2021/07/10/09/55/2021-07-10-09-55-19-286-ef669.xml></link>
<description>Moderate to Strong Mwera wind with speeds of greater than 40km/h are expected to be blowing over lake Malawi, which are expected to cause a wave height of 3 meters.</description>
<category>Met</category>
<pubDate>Sat, 10 Jul 2021 09:52:52 +0000</pubDate>
<guid isPermaLink="false">urn:oid:2.49.0.1.454.0.2021.7.10.9.52.52</guid>
<dc:creator>[email protected] (Malawi Department of Climate Change and Meteorological Services)</dc:creator>
<dc:date>2021-07-10T09:52:52+00:00</dc:date>
</item>
<item>
<title>Chance of heavy rain over most areas of Malawi now diminished.</title>
<link><https://alert-hub-hko.s3.amazonaws.com/mw-met-en/2021/01/23/09/00/2021-01-23-09-00-14-498-a6dd9.xml></link>
<description>Tropical Cyclone ELOISE has shifted to Beira further away from Malawi.Threat of heavy rains and flooding no longer exists.</description>
<category>Met</category>
<pubDate>Sat, 23 Jan 2021 08:55:53 +0000</pubDate>
<guid isPermaLink="false">urn:oid:2.49.0.1.454.0.2021.1.23.8.55.53</guid>
<dc:creator>[email protected] (Malawi Department of Climate Change and Meteorological Services)</dc:creator>
<dc:date>2021-01-23T08:55:53+00:00</dc:date>
</item>
</channel>
</rss>
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="<https://cap-sources.s3.amazonaws.com/mw-met-en/alert-style.xsl>" ?>
<cap:alert xmlns:cap="urn:oasis:names:tc:emergency:cap:1.2">
<cap:identifier>urn:oid:2.49.0.1.454.0.2023.7.19.14.25.12</cap:identifier>
<cap:sender>[email protected]</cap:sender>
<cap:sent>2023-07-19T16:25:12+02:00</cap:sent>
<cap:status>Test</cap:status>
<cap:msgType>Alert</cap:msgType>
<cap:scope>Public</cap:scope>
<cap:info>
<cap:language>en</cap:language>
<cap:category>Met</cap:category>
<cap:event>Strong Mwera winds</cap:event>
<cap:responseType>Prepare</cap:responseType>
<cap:urgency>Expected</cap:urgency>
<cap:severity>Severe</cap:severity>
<cap:certainty>Likely</cap:certainty>
<cap:onset>2023-07-21T01:00:00+02:00</cap:onset>
<cap:expires>2023-07-23T22:00:21+02:00</cap:expires>
<cap:senderName>Malawi Department of Climate Change and Meteorological Services</cap:senderName>
<cap:headline>Mwera winds over Lake Malawi and other water bodies</cap:headline>
<cap:description>Strong Mwera winds with speeds of upto 45km/h are expected to be blowing over Lake Malawi,Lake Malombe,Lake Chilwa and Shire river which are expected to cause high water waves of 1 to 2 meters.</cap:description>
<cap:instruction>Avoid swimming, fishing and sailing over Lake Malawi and other lakes during this period to avoid loss of life and property.</cap:instruction>
<cap:web><http://www.metmalawi.gov.mw/></cap:web>
<cap:contact>[email protected]</cap:contact>
<cap:area>
<cap:areaDesc>Lake Malawi, Shire river, Lake Malombe, Lake Chirwa</cap:areaDesc>
<cap:polygon>-12.2541,34.0137 -13.3255,34.1675 -14.307,34.4641 -15.9191,35.9473 -13.8167,35.7495 -12.8546,35.0903 -11.8458,35.1782 -11.1568,34.9805 -10.4662,34.8706 -9.6007,34.6948 -9.2539,34.3652 -9.5357,33.75 -12.2541,34.0137</cap:polygon>
</cap:area>
</cap:info>
<ds:Signature xmlns:ds="<http://www.w3.org/2000/09/xmldsig#>">
<ds:SignedInfo><ds:CanonicalizationMethod Algorithm="<http://www.w3.org/2001/10/xml-exc-c14n#>"/>
<ds:SignatureMethod Algorithm="<http://www.w3.org/2001/04/xmldsig-more#rsa-sha256>"/>
<ds:Reference><ds:Transforms><ds:Transform Algorithm="<http://www.w3.org/2000/09/xmldsig#enveloped-signature>"/></ds:Transforms><ds:DigestMethod Algorithm="<http://www.w3.org/2001/04/xmlenc#sha256>"/><ds:DigestValue>/nEVK/pQtJEXSFD7NsI4gkaYsXZnvkC6wn2UY3iNoHE=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>s+cieA30lKiAwuMhw7h5EXwyGU4oXrlonOcq2/a8kZ08iP1i8IoMRpB8XLes+HoHXuJb1PBBayfZE/dj+TUYx81si3qPlt+EPQ5dWVe8zWQkhLTXz9ICJ72wx6z7iiWhV8fvOOkajHKl2Io6m+3VvUTwMKAM1UemOEnqTxKzVhMXKbfRiJoCMpsJ6Mg8RUTQIMD4s1qsdp51NMtnizqDxWycyrAFjg2rvOuwuCQSliWbLcD5f0+HsQhVnHdie4movP43Pw2ub8Z/bwyxGpJUuW+HYBA482xUbvAgqyr7aebOruutprQHn9qdeAjLqYWiza/lJawEqbOE1RvWXJnOTQ==</ds:SignatureValue>
<ds:KeyInfo><ds:X509Data><ds:X509Certificate>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</ds:X509Certificate></ds:X509Data></ds:KeyInfo></ds:Signature></cap:alert>
I also noted however that there a multiple feeds available for Malawi. Which one is the right one?
CAP feed found on WMO website.
CAP feed found on Alert Hub.
Have a notification that pops up when the location a client is in has an extreme weather alert
The information to be displayed will mirror yr.no as shown in the image below
