National Weather Service Marquette MI
9:51 PM Friday August 18.
occasional wave height is the
average of the highest 1/10 of the wave spectrum.
synopsis, low pressure of 29.6 inches will track across southwest
quebec tonight. high pressure of 29.9 inches will reach the
western great lakes and then expand southward over the ohio river
valley saturday into sunday. on sunday afternoon a 29.8 inch
trough moves into western lake superior and then tracks east
through sunday night. this trough will linger over the upper
great lakes through monday and move over the eastern great lakes
tuesday. a 30.0 inch area of high pressure will drop south across
the upper mississippi valley on tuesday. 30.2 inch high pressure
over the canadian prairies tuesday morning will reach the western
great lakes by wednesday evening.