US natural gas futures capped the biggest decline in more than a month as plunging oil prices sparked financial outflows from baskets of energy futures contracts. Weather forecasts also shifted milder, indicating lower demand for the heating and power-plant fuel in the coming weeks. US natural gas futures capped the biggest decline in more than a month as plunging oil prices sparked financial outflows from baskets of energy futures contracts. Weather forecasts also shifted milder, indicating lower demand for the heating and powe... [309 chars]