Port Houston’s container handling dropped 18% sequentially and 9% on a year earlier in August. That resulted in the lowest level of shipments for the month of August since 2011, and was the result of closures caused by Hurricane Harvey. The closure was most keenly felt by exporters, which saw a 24% slump in handling to the lowest since June 2009. That may include underlying economic effects to, based on data from Virginia and the western seaboard. Among importers the 15% decline included a 36% slide in shipments from Mexico. That’s unlikely to recover in September given further natural d...