September natural gas prices experienced a choppy early morning trade that was contained in the upper half of Tuesday's range. The market came under heavy selling pressure yesterday morning in response to a court ruling overturning an EPA plan to reduce coal-burning emissions. The market recovered the early losses and closed flat on the session. It appeared that the 2013 natural gas contracts suffered the most pressure, perhaps as the ruling offers coal-fired power plants the chance to operate for a bit longer. The focus of the natural gas market has turned to tropical storm activity brewing in the Atlantic. The National Hurricane Center is tracking Tropical Storm Isaac, which is expected to strengthen to hurricane status by Thursday. US six to ten day weather forecasts show above normal temperatures in the Northeast and areas of west Texas into the Labor Day weekend.