EIA reported a build of 42 Bcf for the week ending 8/13/2021. This was larger than the median estimate of 30 Bcf. Today's stat fell outside the expected range, which was 38 Bcf on the more bearish end, and 19 Bcf on the more bullish end.
Prices were down in the five minutes following the announcement, to $3.745, from $3.757 just before 9:30am.