National Weather Service Chicago/Romeoville IL
2:48 PM Tuesday October 17.
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, expansive high pressure of 30.4 inches will settle over the eastern ohio valley and mid atlantic coast through friday. meanwhile, low pressure of 29.4 inches near james bay will move to northern quebec tonight. a second and much stronger low averaging 28.8 inches will take a similar track across northern manitoba wednesday to hudson bay on thursday. the cold front trailing from this low will move across the lake wednesday night into thursday. another strong low pressure area will move across the canadian prairies on friday and saturday.