During July, NSIDC was forecasting a September minimum of 4.74 million km²
In the August report, they have upped their forecast to 5.0 million km². This is just below my submitted estimate of 5.1 for the minimum, down from my June forecast of 5.5 million.
In June, NSIDC also forecast 5.5, which was identical to my June forecast.
Different methodologies, but we seem to be converging on similar numbers.