National Weather Service Chicago/Romeoville IL
2:42 AM Thursday May 24.
waves are provided as a range of significant wave heights, which is the average of the highest 1/3 of the wave, along with the average height of the highest 10% of the waves which will occasionally be encountered. synopsis, high pressure of 30.2 inches is over lower michigan early this morning. the high will shift to the upper ohio valley today then to the mid atlantic coast tonight. low pressure of 29.5 inches will move from manitoba thursday night into the upper midwest saturday then to lake michigan sunday at 29.8 inches. a 30.0 inch high will build into the western great lakes monday and tuesday.