U.S. natural gas futures jumped by more than 45% in just two days as Arctic cold is descending on the eastern United States with freezing temperatures and warnings of dangerous life-threatening wind chills. On Tuesday, the benchmark U.S. natural gas futures at Henry Hub soared by 23% amid the cold snap and short covering. Natural gas futures jumped by another 22% early on Wednesday, and were headed for their biggest weekly gain in 35 years. The benchmark gas prices surged from $3.40 per million British thermal units (MMBtu) on Monday…