Here are some updates:
TUNEIN
TuneIn is probably the biggest and most important third party streaming platform around. Their database is also used by other apps to point to various streams so if you have relaunched your stream, you will want to get your listing on TuneIn updated. Here is how:
http://help.tunein.com/customer/portal/emails/new?ticket%5Blabels_new%5D=update_submission&t=692442 is the page to use to submit changes to your feed. If you were listed on TuneIn before via Weather Underground, you can get your station ID from the URL TuneIn assigned to your feed (you can Google the callsign of the NOAA Weather Radio feed you provided and a link to TuneIn will likely be prominent in the results. Otherwise, just use TuneIn's search option on their website.)
Example: http://tunein.com/radio/NOAA-Weather-Radio-1624-s80000/ Your station ID in this example is S80000.Fill out the form noted above with details about the station you are feeding. The genre/format is "weather" and you can list the feed times as "24/7" . Do not bother uploading graphics, but do include contact information.
After submitting this form, you need to open a support ticket here:
http://help.tunein.com/customer/portal/emails/new?ticket[labels_new]=broadcaster&
The message you will save you back and forth with TuneIn. In this message send this:
"Weather Underground has decided to cease streaming their weather radio feeds as of March 1, 2017, but the service has actually been offline for the last two weeks. I have been providing a feed of [insert station call letters, location and TuneIn URL to the now defunct stream here] to Weather Underground and as a result of the service being offline I am now relocating my stream to a new host so I can continue independent of Weather Underground. Therefore, so TuneIn listeners can continue to hear my feed, please remove references to Weather Underground and point TuneIn to the URL provided in the stream update form I just completed and sent. If you have any questions, please contact me."
You should get a response in 24-48 hours alerting you they are updating their website and app to reflect the new stream source. You must renounce your affiliation with Weather Underground before they will update your stream on their site. This is done in the support ticket.
LOCATING OLD STREAM HOSTS
Many of the stream providers don't offer a website or identification information about who is providing the stream. But I've found some URLs include personally identifiable user info such as a username or name (mine had my last name in the URL on Wunderground). You may be able to track down who provided the stream with this info. You may also find responsive audiences on any Facebook groups run by the regional NWS forecast office.
The prominence of this thread has been rising on Google as well, so hopefully people will find their way here. It would be nice if Weather Underground might list at least one contact point in their official press releases ending the streams for those that want to continue. We might want to contact them about that before March 1 if we settle on a site streamers can visit for more info on how to relaunch their streams.