* WHAT. High wave action, strong currents, and dangerous swimming conditions expected for Memorial Day. Piers may be heavily swamped by waves. * WHERE. Mason, Oceana, Muskegon, Ottawa, Allegan and Van Buren counties. * WHEN. From Monday morning through Monday evening. * IMPACTS. Strong currents can pull swimmers into deeper water and high waves can sweep people off piers.

* WHAT. West winds 10 to 20 knots with gusts up to 30 knots and waves 3 to 5 feet expected. * WHERE. St Joseph to Manistee. * WHEN. From 8 AM to 8 PM EDT Monday. * IMPACTS. Conditions will be hazardous to small craft.

At 420 PM EDT, Doppler radar was tracking a strong thunderstorm 7 miles northwest of Colon, or 12 miles northeast of Three Rivers, moving north at 35 mph. HAZARD. Winds in excess of 40 mph. SOURCE. Radar indicated. IMPACT. Gusty winds could knock down tree limbs and blow around unsecured objects. This strong thunderstorm will be near. Battle Creek and Climax around 440 PM EDT.

At 415 PM EDT, Doppler radar was tracking strong thunderstorms along a line extending from 9 miles west of Wayland to 6 miles northeast of Plainwell. Movement was northeast at 35 mph. HAZARD. Winds in excess of 40 mph. SOURCE. Radar indicated. IMPACT. Gusty winds could knock down tree limbs and blow around unsecured objects. Locations impacted include. Grand Rapids. Wyoming. Kentwood. Walker. Grandville. East Grand Rapids. Hudsonville. Rockford. Coopersville. Sparta. Wayland. Lowell. Middleville. Caledonia. Freeport. Martin. Jenison. Allendale. Ada.

* WHAT. High wave action, strong currents, and dangerous swimming conditions expected for Memorial Day. Piers may be heavily swamped by waves. * WHERE. Mason, Oceana, Muskegon, Ottawa, Allegan and Van Buren counties. * WHEN. From Monday morning through Monday evening. * IMPACTS. Strong currents can pull swimmers into deeper water and high waves can sweep people off piers.

* WHAT. Northwest winds 10 to 20 knots with gusts up to 30 knots and waves 3 to 5 feet expected. * WHERE. St Joseph to Manistee. * WHEN. From 8 AM to 8 PM EDT Monday. * IMPACTS. Conditions will be hazardous to small craft.

SVRGRR The National Weather Service in Grand Rapids has issued a * Severe Thunderstorm Warning for. Southeastern Kent County in southwestern Michigan. * Until 515 PM EDT. * At 446 PM EDT, a severe thunderstorm was located over Caledonia, or 13 miles southeast of Grand Rapids, moving north at 40 mph. HAZARD. 60 mph wind gusts. SOURCE. Radar indicated. IMPACT. Expect damage to roofs, siding, and trees. * This severe thunderstorm will be near. Kentwood and Gerald R. Ford International Airport around 450 PM EDT.