* WHAT...High wave action, strong currents, and dangerous swimming conditions expected. Piers may be heavily swamped by waves.
* WHERE...Mason, Oceana, Muskegon, Ottawa and Allegan counties.
* WHEN...From Sunday afternoon through late Sunday night.
* IMPACTS...Strong currents can pull swimmers into deeper water and high waves can sweep people off piers.
* Winds and waves will become onshore Sunday afternoon, and cause conditions to become more hazardous.