A report issued by the American Gas Association (AGA) that comes out each week at 2:00 P.M. ET on Wednesday and shows how much natural gas is in storage in the United States in billions of cubic feet. It is widely watched by traders in the natural gas market. If storage levels are low, or if the data is lower than had been anticipated, then prices will likely shoot higher. Conversely, if the amount of natural gas in storage exceeds expectations or is at historically high levels, then prices are likely to fall, because there is too much supply relative to demand.