National Weather Service Chicago/Romeoville IL
8:48 PM Friday August 18.
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 29.5 inches moving into southern
quebec will lift east of james bay saturday and continue across
northern quebec sunday. a ridge averaging 30.0 inches stretches
along the mississippi valley will spread across much of the
midwest saturday. low pressure of 29.8 inches will form over the
central great plains this weekend and remain there through tuesday
while another low of 29.5 inches moves from northern manitoba
saturday to quebec tuesday as a trailing cold front sweeps south
across lake michigan.