* WHAT...High wave action, strong currents, and dangerous swimming conditions expected. Piers may be heavily swamped by waves.
* WHERE...Mason, Oceana and Muskegon counties.
* WHEN...From late tonight through late Saturday night.
* IMPACTS...Strong currents can pull swimmers into deeper water and high waves can sweep people off piers.
* ADDITIONAL DETAILS...South westerly winds of 15 to 25 mph will build waves tomorrow morning into the 3 to 6 foot range. Dangerous waves and currents are expected tomorrow afternoon and early evening, especially at beaches north of Grand Haven.