NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
2:51 AM Sunday MAY 28.
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 29.7 inches over central illinois this morning will pass near the south end of lake michigan today as it lifts northeast into lower michigan by this evening. another low of 29.6 inches over northwest ontario will deepen to 29.4 inches north of the lakes by early monday. this low will only slowly drift east to near james bay through tuesday night, eventually filling to 29.6 inches across northwest quebec by late wednesday. meanwhile, high pressure of 30.2 inches will build across the northern plains tuesday and shift to the ohio valley thursday.