National Weather Service Chicago/Romeoville IL
8:55 AM Thursday February 22.
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 30.6 inches over upper michigan this morning will move to maine late tonight. a low of 30.1 inches will lift from the mid mississippi valley early friday across the western great lakes friday afternoon. high pressure of 30.5 inches will build across the dakotas friday and move to quebec saturday. low pressure of 29.5 inches will develop over the central plains friday night and lift across lake superior sunday at 29.0 inches. a 30.2 inch inch will build over the central plains monday and move to the upper ohio valley tuesday.