You could modify this service to email you instead of send you a text message (this is a tutorial to text you anytime a certain URL shows up on HN) https://www.twilio.com/blog/2015/04/get-notified-when-someon...
I wonder what it would take to get an HN article source added to services like ifttt or zapier?
Check out the top Zap listed here: http://mikeknoop.com/my-zaps/
(it uses the Algolia search engine as a feed of posts to trigger on)