Natural gas prices mounted hefty gains for November bidweek trading amid uncertainty over the potential for colder weather in the coming weeks. Strong export demand fueled by an urgent need to restock global inventories ahead of winter also aided the rally for U.S. markets.

NGI’s November 2021 Bidweek National Avg. surged 63.5 cents month/month to $6.130/MMBtu. This compares with the November Nymex futures settlement of $6.202 and NGI’s November 2020 National Average of $2.745.

The November 2021 Bidweek trading took place Oct. 25-27, reflecting NGI’s decision in May to move to a three-day bidweek trading period.

Despite the multi-year highs set along the Nymex futures strip in recent days, the December contract has failed to sustain the momentum since taking over the...