Despite falling temperatures in the North and chilly winds from Hurricane Lee in the East, weekly natural gas cash prices advanced amid supply interruptions and lingering cooling demand in the South.

NGI’s Weekly Spot Gas National Avg. for the Sept. 11-15 period gained 5.5 cents to $2.410.

Conditions during the week remained sultry in the Southwest and hot in other parts of the South, supporting prices. Production hovered just shy of 100 Bcf/d for much of the week, down about 2 Bcf/d from September highs due to repair work in the Permian Basin, adding to the bullish price sentiment.

But price gains were held in check by autumn-like temperatures in northern markets. Hurricane Lee also delivered cool air to New England ahead of the weekend, keeping a lid on natural gas prices...