I just got an e-mail from a NWS mailing list and it reports there are problems today with the feeds originating at the NWS. Be patient and hopefully the problems will disappear when the problem is resolved.
From the e-mail:
Hi Folks,
We've been fighting a database problem on the NWS (hq) farm. In the
course of dealing it, we've had the site up and down several times
today. This should only be impacting the SOAP/REST service for brief
periods, however, any of the services that query the zip code database
will not be working.
This has also impacted the updating of the CAP/watch/warning and current
observation feeds.
Bob