The city list is retrieved from the NWS using a private method if the NWS is online and from a file if the NWS is not online, and the method caches state and city information to improve performance.
Data flows from the NWS server into my server, where the server-side script converts XML to HTML.
数据从NWS服务器流动到我的服务器，服务器端脚本将xml转换为HTML。
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The forecast is retrieved from the NWS if the NWS is online and from a file if it is not online, and the method USES the cached state and city information to improve performance.