This is a set of RSS feeds from NOAA's National Hurricane Center with notices about tropical storms in the Atlantic and Pacific. These include map data and storm forecasts ("outlooks").
https://www.nhc.noaa.gov/aboutrss.shtml and archived data that can be used for testing https://www.nhc.noaa.gov/aboutrssupdates.shtml
The "wallets" are a fixed number of slots that are assigned to active storms.
Get a feed of the Atlantic Storm GIS data.
GET https://www.nhc.noaa.gov/rss_examples/gis-at.xml
<rss version="2.0">
<channel>
<pubDate>Thu, 06 Jun 2013 03:07:32 GMT</pubDate>
<title>National Hurricane Center GIS Data (Atlantic)</title>
<description>
Atlantic Basin GIS Data for Active Tropical Cyclones
</description>
<link>http://www.nhc.noaa.gov/gis/</link>
<copyright>none</copyright>
<managingEditor>nhcwebmaster@noaa.gov (NHC Webmaster)</managingEditor>
<language>en-us</language>
<webMaster>nhcwebmaster@noaa.gov (NHC Webmaster)</webMaster>
<image>
<url>http://www.nhc.noaa.gov/gifs/xml_logo_nhc.gif</url>
<link>http://www.nhc.noaa.gov/</link>
<title>National Hurricane Center GIS Data (Atlantic)</title>
<description>NOAA logo</description>
<width>95</width>
<height>45</height>
</image>
<item>
<title>
Graphical Tropical Weather Outlook [shp] - Multiple Basins
</title>
<description>
Shapefile last updated Thu, 06 Jun 2013 02:34:27 GMT
</description>
<pubDate>Thu, 06 Jun 2013 02:34:27 GMT</pubDate>
<link>http://www.nhc.noaa.gov/gtwo/two.zip</link>
<guid isPermaLink="false">gis-gtwo-shp-201306052336</guid>
<author>nhcwebmaster@noaa.gov (NHC Webmaster)</author>
</item>
...Get a feed of the tropical storm outlook text for the Eastern Pacific.
GET https://www.nhc.noaa.gov/rss_examples/index-ep.xml
<rss version="2.0">
<channel>
<pubDate>Thu, 30 May 2013 19:07:15 GMT</pubDate>
<title>National Hurricane Center (Eastern Pacific)</title>
<description>Active tropical cyclones in the Eastern Pacific</description>
<link>http://www.nhc.noaa.gov/</link>
<copyright>none</copyright>
<managingEditor>nhcwebmaster@noaa.gov (nhcwebmaster)</managingEditor>
<language>en-us</language>
<webMaster>nhcwebmaster@noaa.gov (nhcwebmaster)</webMaster>
<image>
<url>http://www.nhc.noaa.gov/gifs/xml_logo_nhc.gif</url>
<link>http://www.nhc.noaa.gov/</link>
<title>National Hurricane Center (Eastern Pacific)</title>
<description>NOAA logo</description>
<width>95</width>
<height>45</height>
</image>
<item>
<title>Eastern Pacific Tropical Weather Outlook</title>
<description>
<br/> 000<br/> ABPZ20 KNHC 301733<br/> TWOEP <br/> <br/> TROPICAL WEATHER OUTLOOK<br/> NWS NATIONAL HURRICANE CENTER MIAMI FL<br/> 1100 AM PDT THU MAY 30 2013<br/> <br/> FOR THE EASTERN NORTH PACIFIC...EAST OF 140 DEGREES WEST LONGITUDE..<br/> <br/> THE NATIONAL HURRICANE CENTER IS ISSUING ADVISORIES ON TROPICAL<br/> DEPRESSION BARBARA...LOCATED NEAR THE GULF COAST OF MEXICO.<br/> <br/> SHOWERS AND THUNDERSTORMS HAVE MOSTLY DISSIPATED IN ASSOCIATION WITH<br/> THE AREA OF LOW PRESSURE LOCATED ABOUT 500 MILES SOUTH OF THE<br/> SOUTHERN TIP OF THE BAJA CALIFORNIA PENINSULA. ENVIRONMENTAL<br/> CONDITIONS DO NOT FAVOR REDEVELOPMENT OF THE LOW AS IT MOVES<br/> NORTHEASTWARD AT ABOUT 10 MPH DURING THE NEXT COUPLE OF DAYS. THIS<br/> SYSTEM HAS A LOW CHANCE...NEAR 0 PERCENT...OF BECOMING A TROPICAL<br/> CYCLONE DURING THE NEXT 48 HOURS.<br/> <br/> ELSEWHERE...TROPICAL CYCLONE FORMATION IS NOT EXPECTED DURING THE<br/> NEXT 48 HOURS.<br/> <br/> $$<br/> FORECASTER LANDSEA<br/> <br/>
</description>
<pubDate>Thu, 30 May 2013 17:33:25 GMT</pubDate>
<link>http://www.nhc.noaa.gov/gtwo_epac.shtml</link>
<guid>
http://www.nhc.noaa.gov/gtwo_epac.shtml?201305301733
</guid>
<author>nhcwebmaster@noaa.gov (nhcwebmaster)</author>
</item>
...Keywords: weather, hurricane, typhoon, tropical storm, US government