Yes, I have a script that will report snowfall amounts from the NWS for a set of periods from the present, broken typically into 12 hour segments. It returns a bunch of other stuff too. The goal of the script is to return a PHP 'array' of information to you, again broken into those 12 hour segments. You can see its output here:
http://www.wxforum.net/index.php?topic=17430.0. My code is a work in progress, and I have not gotten it anywhere near to 'release ready'. But, if nobody else has something, I'd be happy to send you what I have, with a big 'caveat emptor' Please know it's more than one file (using some XML/SOAP support code), you'll need to create a bit of a directory structure on your website, there's no documentation (as it's a work in progress) and what is returns is a PHP array, not nice output for a web page.