* WHAT...High wave action, strong currents, and dangerous swimming conditions expected. Piers may be heavily swamped by waves.
* WHERE...Oceana, Muskegon, Ottawa, Allegan and Van Buren counties.
* WHEN...Until midnight EDT tonight.
* IMPACTS...Strong currents can pull swimmers into deeper water and high waves can sweep people off piers.
* ADDITIONAL DETAILS...Beaches on the north sides of piers will be the most dangerous this afternoon.