Natural-gas prices on Thursday posted their biggest one-day gain in two months after a smaller-than-expected increase in U.S. inventories reignited fears that supplies are too low. Producers added 24 billion cubic feet to stockpiles in the week ended April 11, less than the 34 billion cubic feet average forecast by analysts and traders in a Wall Street Journal survey. Gas supplies are coming off an 11-year-low after a frigid winter boosted demand to burn it for home heating. The slow rise for inventories since the arrival of warmer weather is raising questions about whether producers will replenish the country’s stockpile in time for next winter. Prices shot up after the data, with gas for May delivery ending up 4.7% at $4.741 per million British thermal units on the New York Mercantile Exchange. It was the biggest percentage gain since Feb. 19. “We’re talking about a massive storage deficit that […]