The note wit RC= usually indicates a connectivity issue from your webserver to tgftp.nws.noaa.gov site. Could be DNS resolution, could be a routing issue, could be a firewall block by NWS if you've made too many requests in a period.
Running a view-source on your homepage with ?debug=y&force=1 showed:
<!-- mtr_conditions using METAR ICAO='KIAD' -->
<!-- curl fetching 'https://tgftp.nws.noaa.gov/data/observations/metar/stations/KIAD.TXT' -->
<!-- curl Error: Operation timed out after 6002 milliseconds with 0 bytes received -->
<!-- HTTP stats: RC=0 dest=140.90.101.79 port=443 (from sce=50.87.144.89)
Times: dns=0.001 conn=0.069 pxfer=0.204 get=5.799 total=6.003 secs -->
<!-- headers returned:
-->
<!-- mtr_conditions returns RC='' for ICAO/METAR='KIAD' -->
<!-- CU_RainRateIcon in='unable to load KIAD data RC=' icon='5' rate='0.00' uom='in' -->
so it is a connection issue. I suspect it is either routing or firewall at NWS site from you at 50.87.144.89 to them at 140.90.101.79.
Try asking nco.ops@noaa.gov if there is a firewall block for accesses from 50.87.144.89.