* WHAT...Dangerous swimming conditions from high waves and rip currents expected. Waves as high as 4 to 8 feet possible. * WHERE...Presque Isle, Alpena, Alcona and Iosco Counties. * WHEN...From late tonight through Tuesday evening. * IMPACTS...A high swim risk means that life-threatening waves and currents are expected. Stay out of the water and stay away from dangerous areas like piers and breakwalls.