American Trucking Associations’ advanced seasonally adjusted (SA) For-Hire Truck Tonnage Index jumped 7.1% in August, following a 0.5% gain during July. In August, the index equaled 149 (2000=100), up from 139.1 in July.

Compared with August 2016, the SA index surged 8.2%. In July, the index rose 2.7% on a year-over-year basis. Year-to-date, compared with the same eight months in 2016, the index is up 2.1%.

As part of this report, ATA also revised its July increase in the index upward to a 0.5% gain from the previously reported 0.1% increase.

The not seasonally adjusted index, which represents the change in tonnage actually hauled by the fleets before any seasonal adjustment, equaled 156.4 in August, which was 10.5% above the previous month (141.6).

“Tonnage was stronger than most other economic indicators in August and more than I would have expected,” said ATA Chief Economist Bob Costello. “However, prep work for the hurricanes and better port volumes likely gave tonnage an added boost during the month.

“I suspect that short-term service disruptions from when the storms made landfall, as well as the normal ebb and flow of freight, could make September weaker and tonnage will smooth out to more moderate gains, on average.”