National Weather Service Chicago/Romeoville IL
2:45 AM Thursday June 21.
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 iowa this morning
will slowly move to central illinois friday morning and then to
near lake erie on saturday, as a weak ridge of high pressure
remains stretched from the northern lakes region to new england.
weak low pressure will move across ontario saturday and into
quebec saturday night. a trailing cold front will move south
across the region sunday night with high pressure of 30.2 inches
moving across the great lakes on monday.