One system headed for the Gulf of Mexico should have the attention of the United States, Cuba and Mexico, and two systems with development chances follow a tropical storm in the Atlantic Ocean. All that and Hurricane Isaac are in the National Hurricane Center’s Sunday updates on the weather system activity in the Atlantic region.

The National Hurricane Center is monitoring a disturbance that could form over the Western Caribbean over the next week.

A port strike on the U.S. East Coast and Gulf of Mexico will go ahead starting on Tuesday, the International Longshoremen’s Association union said on Sunday, signaling action that could cause delays and snarl supply chains.

Businesses are preparing for a strike by dockworkers on the East and Gulf Coasts, which could begin Oct. 1 if negotiations don’t yield a new contract.