** Shares of U.S. natural gas companies gain, tracking rise in natgas futures NGA/
** U.S. natgas futures NGc1 up 1.5% at $3.148 per million British thermal unit, putting the contract on track for its highest close since July 22
** U.S. natural gas futures jump eight-week high on lower daily output in recent days and forecasts for more demand over the next two weeks than previously expected
** Shares of natgas companies: CNX Resources CNX.N up 1%, Williams Companies WMB.N rise ~1.4%, Sempra SRE.N up 1.5% and Energy Transfer ET.N up marginally
** ETFs - United States Natural Gas Fund UNG.P up 1.5% and ProShares Ultra Bloomberg Natural Gas BOIL.P gains ~3%
(Reporting by Dharna Bafna)
((Dharna.bafna@thomsonreuters.com))