U.S. natgas futures jump over 5 pct on forecasts for colder weather
(Adds latest prices) Jan 29 (Reuters) - U.S. natural gas futures ended up more than 5 percent on Friday in a short covering rally on forecasts for colder weather through the middle of February that should boost heating demand. After trading within a few cents of unchanged for eight straight days, front-month gas futures on the New York Mercantile Exchange closed up 11.6 cents, or 5.3 percent, at $2.298 per million British thermal units. That put the front month up over 7 percent f