National Weather Service Chicago/Romeoville IL
2:33 AM Friday November 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, low pressure of 29.2 inches over western ontario will deepen to 29.1 inches as it passes north of the lakes today. a cold front trailing the low will move across lake michigan tonight, as high pressure of 30.1 inches builds across the plains. this high will move across the western great lakes over the weekend, before a 29.8 inch low passes over, or very close to the northern great lakes sunday. high pressure of 30.2 inches will then build across the great lakes through early next week.