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Post about NHC/CPHC

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~lucidiot 2023-11-05 13:29:40 +01:00
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@ -1863,6 +1863,34 @@ because astronomers need coffee to go through the night -->
<georss:featureTypeTag>landing-site</georss:featureTypeTag>
<georss:relationshipTag>used-as-example</georss:relationshipTag>
</item>
<item>
<title>National Hurricane Center and Central Pacific Hurricane Center</title>
<pubDate>Sun, 05 Nov 2023 13:24:50 +0100</pubDate>
<guid isPermaLink="false">nhc-cphc</guid>
<category domain="https://envs.net/~lucidiot/rsrsss/">OPML</category>
<category domain="https://envs.net/~lucidiot/rsrsss/">Weather</category>
<link>https://envs.net/~lucidiot/rsrsss/opml/noaa/nhc.opml</link>
<description><![CDATA[
<p>The <abbr title="National Oceanic and Atmospheric Administration">NOAA</abbr>'s National Hurricane Center and Central Pacific Hurricane Center are two distinct official bodies responsible for watching out for cyclones around North America. There used to also be an Eastern Pacific Hurricane Center, with the <abbr title="National Hurricane Center">NHC</abbr> being solely responsible for the Atlantic side of things, but those two got merged. The <abbr title="Central Pacific Hurricane Center">CPHC</abbr>'s website got merged with the NHC's, but they remain distinct entities, perhaps for redundancy if one of them loses to a cyclone.</p>
<p>The NHC provides a myriad of feeds, with an RSS button available on the header of every webpage, but <a href="https://www.nhc.noaa.gov/aboutrss.shtml" target="_blank">the list of feeds</a> it links to is quite hard to read. Feed autodiscovery is supported, with 11 of their feeds listed as <code>&lt;link /&gt;</code> tags. Among this hodgepodge of feeds, you'll find:</p>
<ul>
<li>2-day forecasts for every depression, storm or cyclone under their watch, as images or as text;</li>
<li>Updates to their KMZ or SHP exports, either individually for each cyclone or for an overview over one of their three regions, for geospatial people, with <a href="https://www.nhc.noaa.gov/gis/rss.php" target="_blank">further docs on how to use them</a>;</li>
<li>Descriptions of each depression, storm or cyclone as separate items;</li>
<li>The latest weather report as a podcast (this seems to be inactive);</li>
<li>Flight plans for any weather reconnaissance flights they might have each day;</li>
<li><dfn>Discussions</dfn>, longer weather reports written less to follow a standard maritime/aviation weather report and more to be human-readable;</li>
<li>Monthly overviews of tropical weather;</li>
<li>Forecasts dedicated to navigation in offshore waters, in high seas, HF radio transmission quality, probable wind speeds for storms, etc.;</li>
<li>Advisories of incoming hurricanes, or forecasts, or status updates, or <abbr title="International Civil Aviation Organization">ICAO</abbr>-compliant ones.</li>
</ul>
<p>That's a lot. Most of these feeds are divided by region (Atlantic, Central Pacific or East Pacific, per <abbr title="World Meteorological Organization">WMO</abbr> conventions), and by "storm wallet". A storm wallet is a large binder or collection of binders that forecasters used to archive all of their data into once each cyclone dissipates, numbered 1 to 5, to match the maximum advisory level reached. In the case of those feeds, this means each storm wallet is actually the current advisory level for the storm. Some feeds also have versions in Spanish, updated by their Puerto Rico office when they feel like it.</p>
<p>To make it slightly easier for feed aficionados (<em>afeedcionados</em>?) to figure out what they might be interested in, I wrote <a href="https://tildegit.org/lucidiot/rsrsss/src/commit/773c10f95655ae0650d6b72da5eb7c5d9a02bab9/bin/build_nhc_opml" target="_blank">a terrible script</a> to build an <abbr title="Outline Processor Markup Language">OPML</abbr> file listing every available feed. You can access it and add it to your feed reader <a href="https://envs.net/~lucidiot/rsrsss/opml/noaa/nhc.opml" target="_blank">here</a>; feel free to remove the likely numerous duplicates from your reader afterwards.</p>
<p>Note that some of these feeds include a <code>&lt;gml:Point&gt;</code> element in the items describing weather systems, but it isn't wrapped within a <code>&lt;georss:where&gt;</code> element, making those feeds <a href="https://validator.w3.org/feed/check.cgi?url=https://www.nhc.noaa.gov/rss_examples/gis-ep-20130530.xml" target="_blank">invalid</a>. This strangeness is what made me have a deeper look into GeoRSS in the first place, leading to the series of articles I posted in the last few weeks.</p>
]]></description>
</item>
</channel>
<access:restriction relationship="allow" />
</rss>