for the love of God do NOT trade UNG - it is the worst investment product known to man. goog "ung problems" and see what comes up. this issue has been discussed in depth.
Thanks for the concern Frank. I am aware of the severe contango and know the long term trend is toward zero; however, I have swing and occasionally day traded HNU (the Canadian equivalent of UNG but 2:1) with some success. The last time there was a big gap up like that in natgas (without a corresponding gap up in UNG/HNU) was april 24.
http://commodityhq.com/2012/seven-etfs-to-ride-the-natral-gas-rally/ UNL or GASZ. UNL's probably better if you consider yourself a beginner. It's up today, btw.