 So the NYMEX August crude contract lost 0.4% on Monday, ending at $81.91 a barrel. But the big loser to start the week was natural gas, largely because of forecasts for lower-than-normal temperatures across much of the eastern U.S. by the middle of next week. If that happens, that will put a big dent in the demand for natural gas-fired electricity to power air conditioning. So the NYMEX August natural gas contract plummeted 7.3% to start the week,