* WHAT...High wave action, strong currents, and dangerous swimming conditions expected. Piers may be swamped by waves.
* WHERE...Mason, Oceana, Muskegon, Ottawa and Allegan counties.
* WHEN...From late tonight through Sunday evening.
* IMPACTS...Strong currents can pull swimmers into deeper water and high waves can sweep people off piers.
* ADDITIONAL DETAILS...Winds from the south will make waves and currents more hazardous near south piers, including at Grand Haven State Park and Pere Marquette Park in Muskegon.