The Commodities ETF (DBC) began and ended today (Tuesday) at the apex of and in between trendline resistance and support, as shown on the Daily chart below...an important one to watch tomorrow and thereafter!
An indication of weakness would likely be confirmed by a failure of AUD/USD to regain and hold above 1.05, along with further weakness in China's Shanghai Index, as discussed in my posts of August 17th and August 15th.