Natural gas prices on Monday soared to their biggest one-day gain in nearly nine months, as traders and investors braced for below-normal temperatures that are expected to stoke demand for the heating fuel. The arrival of frigid weather early in the season is reviving concerns that another brutal winter could strain the nation’s natural-gas supplies. Last year’s severe cold led to record gas consumption by businesses, households and utilities and a sharp runup in prices. Over the weekend, several weather forecasters revised downward their projections for temperatures in the eastern U.S. during the Thanksgiving holiday weekend. That has spurred analysts and traders to draw comparisons with last winter, which also ended up being unexpectedly cold and a drag on economic growth generally. Natural gas for December delivery jumped 8% to $4.341 a million British thermal units on the New York Mercantile Exchange. That’s the largest one-day […]