Wouldn't call it "sudden change of sentiment"... since the one-year high on Jan 7 we are going down... factors for the sell off on Monday was another slightly better weather forecast it seems. Also fast money is short and adding if anything.
And it's not looking that bullish going forward... from Bloomberg:
"The number of gas drilling rigs operating in the U.S.
climbed to 905 last week, a 36 percent jump from a seven-year
low reached in July, according to data from Baker Hughes Inc.
âThere is now no supporting weather under this market,â
Rose said. âThe market, left to its own, is headed for lower
prices with the rig count.â