National Weather Service Chicago/Romeoville IL
8:03 AM Monday April 23.
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 30.4 inches over new england has ridging extending west across the great lakes. low pressure of 29.7 inches is over western tennessee and will meander over the area through tuesday then shift to the mid atlantic coast by early wednesday. a cold front will move across lake michigan tuesday night. another 30.4 inch high will build across the central plains tuesday night with a ridge extending into the western great lakes, which will shift to the ohio valley thursday. low pressure of 29.5 inches will move from hudson bay wednesday night to northern quebec thursday night as a trailing cold front pushes across lake michigan.