From here, forecasts for winds and waves for the 20th of May 2009 in the Gulf of Aden, off East Somalia and by the Seychelles. Click to enlarge.
Wind and waves not looking good for pirate action off eastern Somalia or near the Seychelles. Winds increasing in Gulf of Aden, but waves still under/about 1 meter. Monsoon weather expected in about 10 days, with a subsequent decrease in piracy.