Tony,
The URL you cited with the warning in the first post:
http://www.weather.gov/alerts/co.html#COZ240.BOURFWBOU.222300has 'COZ240' as the zone . If you find your location on
www.weather.gov and mouse over the warnings in red, you'll see the zone you should probably use for your location.
Looking at the forecast for 'Thornton, CO', I find three current messages:
Hazardous Weather Outlook
Red Flag Warning
Short Term Forecast
Each of the URLs shows one zone for your locale (COZ040) and a different one for your Firewarning (COZ240)
The RSS feed for COZ040 only includes the Short Term Forecast (Hazardous Weather Outlooks aren't included in the RSS feeds).
The RSS feed for COZ240 only includes the Red Flag Warning.
It looks like you should use COZ040 for your primary zone. I don't know why the NWS has separate zones for your location, but they don't offer a 'combined' feed that would replicate what appears on the
www.weather.gov page for your area.
Best regards,
Ken