I've been getting "**** Error: Bad Alert XML file (parseXML) (www.tupeloweather.com)" every time my CRON job runs for the past 3 days but on only one site, even though I have the script running on other sites also. Anyone have ideas what the cause might be?

I'm seeing the same thing on the site I use it on:

What stations are you using? For me, it's:

Sparta, NJ: K12N / NJZ001

and

White Haven, PA: KAVP / PAZ047

I use Davis Vantage Pro 2 stations. Currently, I have two sites with stations and some sites that I use NWS data only to populate. I'm building a new site that will have at least 7 Vantage Pro 2 stations/locations.
The site I'm having trouble with is TupeloWeather.com which is running the newest version of ZWeather - 6.0.3.2.
I only have one more site that is running this version and it is having no problem. Therefore, it doesn't seem like a ZWeather issue but it doesn't seem like an NWS issue since it's been going on for so long.
I don't know {scratching head}.

I just realized that you weren't asking what weather stations I use, but rather what NWS stations for my alert data.
The problem location is KTUP and MSZ016.

If you can save a copy of the XML file, I can look at it and forward it to the NWS if there is a problem with their feed.

I have been having the same problem with this error since 1/26/2011 every time the Cron runs also!

I have the latest version of Z-Weather installed.