National Weather Service Marquette MI
4:02 AM Thursday May 24.
waves are the significant wave height - the average of the highest 1/3 of the wave spectrum. occasional wave height is the average of the highest 1/10 of the wave spectrum. synopsis, high pressure of 30.2 inches over the lower great lakes will slide off the east coast on friday as low pressure of 29.6 inches expands from the canadian prairies to the western great lakes. expect the low pressure trough to diminish to 29.9 inches by monday as it moves to the lower great lakes. high pressure of 30.1 inches will then build across northern ontario and the upper great lakes by late monday.